Volume 1 of 2

                 FOR PUBLICATION
 UNITED STATES COURT OF APPEALS
      FOR THE NINTH CIRCUIT

ABDULLAH AL-KIDD,                        No. 06-36059
               Plaintiff-Appellee,
              v.                           D.C. No.
                                         CV-05-00093-EJL
JOHN ASHCROFT,
                                            OPINION
            Defendant-Appellant.
                                     
       Appeal from the United States District Court
                 for the District of Idaho
        Edward J. Lodge, District Judge, Presiding

                  Argued April 8, 2008
                 Submitted May 18, 2009
                   Seattle, Washington

                 Filed September 4, 2009

      Before: David R. Thompson, Carlos T. Bea, and
            Milan D. Smith, Jr., Circuit Judges.

           Opinion by Judge Milan D. Smith, Jr.
   Partial Concurrence and Partial Dissent by Judge Bea




                          12265
12270                AL-KIDD v. ASHCROFT
                         COUNSEL

Robert M. Loeb and Matthew M. Collette, Department of Jus-
tice, Civil Division, Washington, D.C., for the defendant-
appellant.

Lee Gelernt, Immigrants’ Rights Project, American Civil Lib-
erties Union, New York, New York, for the plaintiff-appellee.

Alison M. Tucher, Morrison & Foerster, San Francisco, Cali-
fornia, for amici curiae Former Federal Prosecutors.

Leo P. Cunningham and Lee-Anne Mulholland, Wilson Son-
sini Goodrich & Rosati, Palo Alto, California, for amici curiae
National Association of Criminal Defense Lawyers and
Human Rights Watch.


                         OPINION

MILAN D. SMITH, JR., Circuit Judge:

   According to the allegations of his first amended com-
plaint, Plaintiff-Appellee Abdullah al-Kidd (al-Kidd), a
United States citizen and a married man with two children,
was arrested at a Dulles International Airport ticket counter.
He was handcuffed, taken to the airport’s police substation,
and interrogated. Over the next sixteen days, he was confined
in high security cells lit twenty-four hours a day in Virginia,
Oklahoma, and then Idaho, during which he was strip
searched on multiple occasions. Each time he was transferred
to a different facility, al-Kidd was handcuffed and shackled
about his wrists, legs, and waist. He was eventually released
from custody by court order, on the conditions that he live
with his wife and in-laws in Nevada, limit his travel to
Nevada and three other states, surrender his travel documents,
regularly report to a probation officer, and consent to home
                         AL-KIDD v. ASHCROFT                        12271
visits throughout the period of supervision. By the time al-
Kidd’s confinement and supervision ended, fifteen months
after his arrest, al-Kidd had been fired from his job as an
employee of a government contractor because he was denied
a security clearance due to his arrest, and had separated from
his wife. He has been unable to obtain steady employment
since his arrest.

   Al-Kidd was not arrested and detained because he had
allegedly committed a crime. He alleges that he was arrested
and confined because former United States Attorney General
John Ashcroft (Ashcroft), subordinates operating under poli-
cies promulgated by Ashcroft, and others within the United
States Department of Justice (DOJ), unlawfully used the fed-
eral material witness statute, 18 U.S.C. § 3144, to investigate
or preemptively detain him. Ashcroft asserts that he is entitled
to absolute and qualified immunity against al-Kidd’s claims.
We hold that on the facts pled Ashcroft is not protected by
either form of immunity, and we affirm in part and reverse in
part the decision of the district court.

      FACTS AND PROCEDURAL BACKGROUND1

A.    Al-Kidd

   Plaintiff-Appellee al-Kidd was born Lavoni T. Kidd in
Wichita, Kansas. While attending college at the University of
Idaho, where he was a highly regarded running back on the
University’s football team, he converted to Islam and changed
his name. In the spring and summer of 2002, he and his then-
wife were the target of a Federal Bureau of Investigation
(FBI) surveillance as part of a broad anti-terrorism investiga-
tion allegedly aimed at Arab and Muslim men.2 No evidence
of criminal activity by al-Kidd was ever discovered. Al-Kidd
  1
    All facts are taken from al-Kidd’s first amended complaint, unless oth-
erwise indicated.
  2
    Al-Kidd is Muslim, but is African-American and not of Arab descent.
12272                    AL-KIDD v. ASHCROFT
planned to fly to Saudi Arabia in the spring of 2003 to study
Arabic and Islamic law on a scholarship at a Saudi university.

   On February 13, 2003, a federal grand jury in Idaho
indicted Sami Omar Al-Hussayen for visa fraud and making
false statements to U.S. officials. On March 14, the Idaho
U.S. Attorney’s Office submitted an application to a magis-
trate judge of the District of Idaho, seeking al-Kidd’s arrest as
a material witness in the Al-Hussayen trial. Appended to the
application was an affidavit by Scott Mace, a Special Agent
of the FBI in Boise (the Mace Affidavit). The Mace Affidavit
described two contacts al-Kidd had with Al-Hussayen: al-
Kidd had received “in excess of $20,000” from Al-Hussayen
(though the Mace Affidavit does not indicate what this pay-
ment was for), and al-Kidd had “met with Al-Hussayen’s
associates” after returning from a trip to Yemen. It also con-
tained evidence of al-Kidd’s contacts with officials of the
Islamic Assembly of North America (IANA, an organization
with which Al-Hussayen was affiliated),3 including one offi-
cial “who was recently arrested in New York.” It ended with
the statement, “[d]ue to Al-Kidd’s demonstrated involvement
  3
    The IANA is identified in the Al-Hussayen indictment as an organiza-
tion with the “purpose of Da’wa (proselytizing), which included the web-
site dissemination of radical Islamic ideology the purpose of which was
indoctrination, recruitment of members, and the instigation of acts of vio-
lence and terrorism.”
   The IANA’s web site currently disseminates a list of goals which
include, inter alia, to “[u]nify and coordinate the efforts of the different
dawah oriented organizations in North America and guide or direct the
Muslims of this land to adhere to the proper Islamic methodology”;
“[s]pread the correct knowledge of Islam”; “[w]iden the horizons and
understanding . . . among Muslims concerning different Islamic contempo-
rary issues”; “[a]ssist the oppressed and tyrannized scholars, Islamic work-
ers and Muslim masses in any locality”; and “[c]reate programs and
institutions that will serve the English-speaking Muslims of North Ameri-
ca.” Islamic Assembly of N. Am., About IANA, at http://www.iananet.org/
about.htm (accessed June 10, 2009). Al-Hussayen, then a computer sci-
ence graduate student at the University of Idaho, was accused of register-
ing and running the IANA’s web site.
                     AL-KIDD v. ASHCROFT                  12273
with the defendant . . . he is believed to be in possession of
information germane to this matter which will be crucial to
the prosecution.” The Mace Affidavit did not elaborate on
what “information” al-Kidd might have had, nor how his testi-
mony might be “germane”—let alone “crucial”—to the prose-
cution of Al-Hussayen.

  The affidavit further stated:

    Kidd is scheduled to take a one-way, first class flight
    (costing approximately $5,000) to Saudi Arabia on
    Sunday, March 16, 2003, at approximately 6:00
    EST. He is scheduled to fly from Dulles Interna-
    tional Airport to JFK International Airport in New
    York and then to Saudi Arabia. . . . It is believed that
    if Al-Kidd travels to Saudi Arabia, the United States
    Government will be unable to secure his presence at
    trial via subpoena.

In fact, al-Kidd had a round-trip, coach class ticket, costing
approximately $1700. The Mace Affidavit omitted the facts
that al-Kidd was a U.S. resident and citizen; that his parents,
wife, and two children were likewise U.S. residents and citi-
zens; and that he had previously cooperated with the FBI on
several occasions when FBI agents asked to interview him.
The magistrate judge issued the warrant the same day.

   Pursuant to the material witness warrant, al-Kidd was
arrested two days later at the ticket counter at Dulles Interna-
tional Airport. He was handcuffed and taken to the airport’s
police substation, where he was interrogated. Thereafter, he
was detained for an aggregate of sixteen days at the Alexan-
dria Detention Center in Virginia, the Oklahoma Federal
Transfer Center, and the Ada County, Idaho, Jail. He was strip
searched on multiple occasions and confined in the high-
security unit of each facility. During transfer between facili-
ties, al-Kidd was handcuffed and shackled about his wrists,
legs, and waist. He was allowed out of his cell only one to
12274                      AL-KIDD v. ASHCROFT
two hours each day, and his cell was kept lit twenty-four
hours a day, unlike other cells in the high-security wing.

   On March 31, after petitioning the court, al-Kidd was
ordered released, on the conditions that he live with his wife
at his in-laws’ home in Nevada, limit his travel to Nevada and
three other states, report regularly to a probation officer and
consent to home visits throughout the period of supervision,
and surrender his passport. After almost a year under these
conditions, the court permitted al-Kidd to secure his own resi-
dence in Las Vegas, Nevada, as al-Kidd and his wife were
separating. He lived under these conditions for three more
months before being released at the end of Al-Hussayen’s
trial, more than fifteen months after being arrested.4 In July
2004, al-Kidd was fired from his job. He alleges he was ter-
minated when he was denied a security clearance because of
his arrest. He is now separated from his wife, and has been
unable to find steady employment. He was also deprived of
his chance to study in Saudi Arabia on scholarship.

   Al-Kidd was never called as a witness in the Al-Hussayen
trial or in any other criminal proceeding.

B.     Ashcroft

   Defendant-Appellant Ashcroft was Attorney General of the
United States during the relevant time period. According to
al-Kidd’s complaint, following the September 11, 2001 terror-
ist attacks, Ashcroft developed and promulgated a policy by
which the FBI and DOJ would use the federal material wit-
ness statute5 as a pretext “to arrest and detain terrorism sus-
  4
     Al-Hussayen was not convicted of any of the charges brought against
him. His trial ended in acquittal on the most serious charges, including
conspiracy to provide material support to terrorists, 18 U.S.C. §§ 2339A,
2339B. After the jury failed to reach a verdict on the remaining lesser
charges, the district court declared a mistrial. The government agreed not
to retry Al-Hussayen and deported him to Saudi Arabia for visa violations.
   5
     The federal material witness statute, 18 U.S.C. § 3144, provides:
      If it appears from an affidavit filed by a party that the testimony
                         AL-KIDD v. ASHCROFT                       12275
pects about whom they did not have sufficient evidence to
arrest on criminal charges but wished to hold preventatively
or to investigate further.” (Cited in, and emphasis added, in
al-Kidd’s complaint.)

  To support this allegation, the complaint first quotes Ash-
croft’s own statement at a press briefing:

     Today, I am announcing several steps that we are
     taking to enhance our ability to protect the United
     States from the threat of terrorist aliens. These mea-
     sures form one part of the department’s strategy to
     prevent terrorist attacks by taking suspected terror-
     ists off the street . . . Aggressive detention of law-
     breakers and material witnesses is vital to
     preventing, disrupting or delaying new attacks.

John Ashcroft, Attorney General, Attorney General Ashcroft
Outlines Foreign Terrorist Tracking Task Force (Oct. 31,
2001), available at http://www.usdoj.gov/archive/ag/
speeches/2001/agcrisisremarks10_31.htm (emphasis added in
complaint). The complaint also cites internal DOJ memoranda
quoted in a report by the DOJ’s Office of the Inspector Gen-
eral (OIG Report),6 which describe the use of “aggressive

     of a person is material in a criminal proceeding, and if it is shown
     that it may become impracticable to secure the presence of the
     person by subpoena, a judicial officer may order the arrest of the
     person and treat the person in accordance with the provisions of
     section 3142 of this title. No material witness may be detained
     because of inability to comply with any condition of release if the
     testimony of such witness can adequately be secured by deposi-
     tion, and if further detention is not necessary to prevent a failure
     of justice. Release of a material witness may be delayed for a rea-
     sonable period of time until the deposition of the witness can be
     taken pursuant to the Federal Rules of Criminal Procedure.
  6
    See Office of the Inspector Gen., U.S. Dep’t of Justice, The September
11 Detainees: A Review of the Treatment of Aliens Held on Immigration
12276                     AL-KIDD v. ASHCROFT
arrest and detention tactics in the war on terror,” OIG Report
at 12, including the use of material witness warrants to con-
fine aliens suspected of terrorist involvement, 

75.
The complaint also quotes the public statements of a number
of DOJ and White House officials implying or stating outright
that suspects were being held under material witness warrants
as an alternative means of investigative arrest or preventative
detention. In addition to this direct evidence, the complaint
cites a number of press reports describing the detention of
numerous Muslim individuals under material witness war-
rants. The complaint further alleges that the policies designed
and promulgated by Ashcroft have caused individuals to be
“impermissibly arrested and detained as material witnesses
even though there was no reason to believe it would have
been impracticable to secure their testimony voluntarily or by
subpoena,” in violation of the terms of § 3144.

   In his complaint, al-Kidd links his personal detention to
these broader policies not only through inference, but also
through the statements of Robert Mueller, the Director of the
FBI. On March 27, while al-Kidd was jailed in Idaho, Mueller
testified before Congress, listing five “major successes” in the
FBI’s efforts toward “identifying and dismantling terrorist
networks.” The first was the capture of Khalid Shaikh
Mohammed, identified as “a key planner and the mastermind
of the September 11th attack.” The second was al-Kidd, iden-

Charges in Connection with the Investigation of the September 11 Attacks
(2003), available at http://www.usdoj.gov/oig/special/0306/full.pdf. The
OIG Report’s focus is the post-9/11 detention on immigration charges of
Arab and Muslim aliens, and touches only incidentally on those held as
material witnesses. Because the report, an official government document,
is cited extensively throughout the complaint, we deem it incorporated by
reference, and take judicial notice of its entire contents. See In re Silicon
Graphics Inc. Sec. Litig., 

, 986 (9th Cir. 1999) (permitting
incorporation by reference of documents “whose contents are alleged in a
complaint and whose authenticity no party questions, but which are not
physically attached to the [plaintiff’s] pleading”).
                     AL-KIDD v. ASHCROFT                  12277
tified as having been “arrested . . . en route to Saudi Arabia.”
The other three “successes” all involved individuals “indict-
ed” or “charged” with some crime connected to terrorism. See
FBI’s Fiscal Year (FY) 2004 Budget: Hearing Before the Sub-
commitee on the Departments of Commerce, Justice and
State, House Appropriations Commitee, 108th Cong. (2003)
(statement of Robert S. Mueller, III, Director, FBI), available
at     http://www.fbi.gov/congress/congress03/mueller032703
.htm (hereafter Mueller Testimony).

   Finally, the complaint notes that “material witnesses have
been routinely held in high security detention facilities.” The
OIG Report cites an Assistant U.S. Attorney who complained
that the DOJ’s Bureau of Prisons “did not distinguish between
detainees who, in his view, posed a security risk and those
detained aliens who were uninvolved witnesses.” OIG Report
at 20. It alleges “a general policy” of extensive mistreatment
of material witnesses at the New York City Metropolitan Cor-
rectional Center (MCC). It cites a case, United States v. Awa-
dallah, 

, 59-61 (S.D.N.Y. 2002)
(Awadallah I), rev’d on other grounds, 

(2d Cir.
2003) (Awadallah II), which discusses the conditions of con-
finement of another putative material witness, Osama Awa-
dallah, held in New York City. The complaint avers that
Ashcroft “knew or reasonably should have known of the
unlawful, excessive, and punitive manner in which the federal
material witness statute was being used,” and that such man-
ner “would also foreseeably subject” detainees “to unreason-
able and unlawful use of force, to unconstitutional conditions
of confinement, and to punishment without due process.”

C.   Prior Proceedings

   In March 2005, al-Kidd filed this lawsuit in Idaho federal
district court. The first amended complaint was filed that
November, naming as defendants, among others, Ashcroft,
the United States, Mace and Gneckow (the two FBI agents
named in the Mace Affidavit), and a number of government
12278                   AL-KIDD v. ASHCROFT
agencies and officers in their official capacities.7 It sought
damages under Bivens v. Six Unknown Named Agents of the
Federal Bureau of Narcotics, 

(1971), for viola-
tions of al-Kidd’s rights under the Fourth and Fifth Amend-
ments to the Constitution (a “Bivens action”), and for a direct
violation of § 3144.

   Ashcroft moved to dismiss under Federal Rule of Civil Pro-
cedure 12(b)(2) and 12(b)(6). The district court first denied
the 12(b)(2) motion, holding that al-Kidd had properly alleged
facts sufficient to establish personal jurisdiction over Ashcroft
in Idaho. Specifically, al-Kidd had alleged that Ashcroft
“spear-headed the post September 11, 2001 practice . . . to use
the material witness statute to detain individuals whom they
sought to investigate,” and that “Ashcroft either knew or
should have known the violations were occurring and did not
act to correct the violations.” Next, the district judge denied
the 12(b)(6) motion, rejecting Ashcroft’s claims of absolute
and qualified immunity. The district court held that “[t]he
development and practice of using the material witness statute
to detain individuals while investigating possible criminal
activity qualifies as police type investigative activity, not pro-
secutorial advocacy” for which absolute immunity is reserved.
Turning to the claims for qualified immunity, the district court
held that “the allegations against Mr. Ashcroft involve more
than vicarious liability but assert claims involving Mr. Ash-
croft’s own knowledge and actions related to Mr. Kidd’s
alleged constitutional deprivations.” The principal deprivation
the district court mentioned was the allegation “that probable
cause was not shown in the warrant application.” The district
court also rejected qualified immunity for the FBI agents.

  Ashcroft filed a timely interlocutory appeal.
  7
   Ashcroft is the only defendant in this case who filed an interlocutory
appeal of the district court’s denial of the defendants’ Federal Rule of
Civil Procedure 12(b)(2) and 12 (b)(6) motions. Accordingly, none of al-
Kidd’s claims against the other defendants is before us.
                      AL-KIDD v. ASHCROFT                   12279
     JURISDICTION AND STANDARD OF REVIEW

A.   Failure to State a Claim

   Section 1291 of U.S. Code Title 28 grants this court juris-
diction over “final decisions” of the district court. Ordinarily,
the denial of a motion under Federal Rule of Civil Procedure
12(b)(6) would not constitute a “final decision.” The district
court’s denial of absolute and qualified immunity, however,
is a “final decision” for § 1291 purposes because these immu-
nities are immunities from suit, not just from damages. See
Mitchell v. Forsyth, 

, 525, 527 (1985).

   As we have recognized in the past, interlocutory review of
a Rule 12(b)(6) motion to dismiss puts our court in the diffi-
cult position of deciding “far-reaching constitutional ques-
tions on a nonexistent factual record.” Kwai Fun Wong v.
United States, 

, 957 (9th Cir. 2004). However,
because Ashcroft chose to exercise his right to appeal before
a fuller record could be developed, we proceed as we must in
a review of all Rule 12(b)(6) motions, accepting as true all
facts alleged in the complaint, and drawing all reasonable
inferences in favor of the plaintiff. See Newcal Indus., Inc. v.
Ikon Office Solution, 

, 1043 n.2 (9th Cir. 2008).
To avoid dismissal under Rule 12(b)(6), a plaintiff must aver
in his complaint “sufficient factual matter, accepted as true, to
‘state a claim to relief that is plausible on its face.’ ” Ashcroft
v. Iqbal, 

, 1949 (2009) (quoting Bell Atl. Corp.
v. Twombly, 

, 570 (2007)).

   We review de novo the district court’s rulings on absolute
and qualified immunity. KRL v. Moore, 

, 1110
(9th Cir. 2004); Preschooler II v. Clark County Sch. Bd. of
Trs., 

, 1179 (9th Cir. 2007).

B.   Personal Jurisdiction

  Ashcroft also argues that the district court does not have
personal jurisdiction over him. Because denials of motions to
12280                AL-KIDD v. ASHCROFT
dismiss for lack of personal jurisdiction are not ordinarily
reviewable on interlocutory appeal, Ashcroft requests that this
court exercise its “pendent appellate jurisdiction” to reach the
question of personal jurisdiction.

   In Hendricks v. Bank of America, N.A., we summarized the
criteria for the exercise of pendent appellate jurisdiction:

    Under 28 U.S.C. § 1292(a)(1), we may exercise . . .
    pendent jurisdiction over any otherwise non-
    appealable ruling that is “inextricably intertwined”
    with or “necessary to ensure meaningful review of”
    the order properly before us on interlocutory appeal.
    District court rulings are “inextricably intertwined”
    with a preliminary injunction when the legal theories
    on which the issues advance are so intertwined that
    we must decide the pendent issue in order to review
    the claims properly raised on interlocutory appeal, or
    resolution of the issue properly raised on interlocu-
    tory appeal necessarily resolves the pendent issue.
    We also construe Swint’s “necessary to ensure mean-
    ingful review” language narrowly to require much
    more than a tangential relationship to the decision
    properly before us on interlocutory appeal.

, 1134 (9th Cir. 2005) (quoting Swint v. Cham-
bers County Comm’n, 

, 51 (1995)) (internal quo-
tation marks, citations, and alterations omitted). Thus,
Ashcroft must demonstrate that the issue of personal jurisdic-
tion is either (1) “inextricably intertwined” with or (2) “neces-
sary to ensure meaningful review of” the issues of absolute or
qualified immunity, in order for us to exercise the pendent
appellate jurisdiction he requests.

                        DISCUSSION

  Al-Kidd asserts three independent claims against Ashcroft.
First, he alleges that Ashcroft is responsible for a policy or
                        AL-KIDD v. ASHCROFT                     12281
practice under which the FBI and the DOJ sought material
witness orders without sufficient evidence that the witness’s
testimony was material to another proceeding, or that it was
impracticable to secure the witness’s testimony—in other
words, in violation of the express terms of § 3144 itself—and
that al-Kidd was arrested as a result of this policy (the § 3144
Claim). Second, al-Kidd alleges that Ashcroft designed and
implemented a policy under which the FBI and DOJ would
arrest individuals who may have met the facial statutory
requirements of § 3144, but with the ulterior and allegedly
unconstitutional purpose of investigating or preemptively
detaining them, in violation of the Fourth Amendment (the
Fourth Amendment Claim). Finally, al-Kidd alleges that Ash-
croft designed and implemented policies, or was aware of pol-
icies and practices that he failed to correct, under which
material witnesses were subjected to unreasonably punitive
conditions of confinement, in violation of the Fifth Amend-
ment (the Conditions of Confinement Claim).

   Ashcroft argues that he is entitled to absolute prosecutorial
immunity as to the § 3144 and Fourth Amendment Claims.
He concedes that no absolute immunity attaches with respect
to the Conditions of Confinement Claim. He also argues that
he is entitled to qualified immunity from liability for all three
claims.

A.    Absolute Immunity

   [1] In Bivens actions and those taken under 42 U.S.C. § 1983,8
“[m]ost public officials are entitled only to qualified immuni-
ty.” Buckley v. Fitzsimmons, 

, 268 (1993). Prose-
cutors are entitled to absolute immunity, however, when they
  8
   The qualified and absolute immunity defenses to each are the same.
See Butz v. Economou, 

, 504 (1978) (“[W]e deem it untena-
ble to draw a distinction for purposes of immunity law between suits
brought against state officials under § 1983 and suits brought directly
under the Constitution against federal officials.”).
12282                AL-KIDD v. ASHCROFT
engage in activities “intimately associated with the judicial
phase of the criminal process,” Imbler v. Pachtman, 

, 430 (1976), and done “in the course of [their] role as an
advocate for the State,” 

. They are
entitled only to qualified immunity, however, when they per-
form investigatory or administrative functions, or are essen-
tially functioning as police officers or detectives. 

the United States Attorney General is not entitled to
absolute immunity in the performance of his or her “national
security functions.” 

. The burden to
establish absolute immunity rests with the official seeking it:

    The presumption is that qualified rather than abso-
    lute immunity is sufficient to protect government
    officials in the exercise of their duties. We have been
    “quite sparing” in our recognition of absolute immu-
    nity, and have refused to extend it any “further than
    its justification would warrant.”

Burns v. Reed, 

, 486-87 (1991) (quoting For-
rester v. White, 

, 224 (1988); Harlow v. Fitzger-
ald, 

, 811 (1982)). “[I]f application of the
principle is unclear, the defendant simply loses,” and receives
only the default of qualified immunity. 

(Scalia, J., concurring).

   [2] To determine whether an action is “prosecutorial,” and
so entitled to absolute immunity, the Supreme Court has
adopted a “ ‘functional approach,’ which looks to ‘the nature
of the function performed, not the identity of the actor who
performed it.’ ” 

(quoting 

;

). “In Imbler, the Court concluded
that the ‘reasons for absolute immunity appl[ied] with full
force’ to the conduct at issue because it was ‘intimately asso-
ciated with the judicial phase of the criminal process.’ ” Van
de Kamp v. Goldstein, ___ U.S. ___, 

, 861
(2009) (citing 

). While the “duties of
the prosecutor in his role as advocate for the State involve
                         AL-KIDD v. ASHCROFT                       12283
actions preliminary to the initiation of a prosecution and
actions apart from the courtroom,” 

n.33, absolute prosecutorial immunity will be given “only for
actions that are connected with the prosecutor’s role in judi-
cial proceedings, not for every litigation-inducing conduct,”

.

   As the Supreme Court has acknowledged, the distinction
between the roles of “prosecutor” and “investigator” is not
always clear. See 

n.33 (“Drawing a
proper line between these functions may present difficult
questions . . . .”). The Supreme Court has given us few bright
lines,9 and its cases on prosecutorial immunity have pro-
ceeded on a function-by-function basis. Thus, the Court has
held that prosecutors receive absolute immunity for initiating
a prosecution, 

false or perjured testimony,

in court to apply for a search warrant,

, and for preparing and filing an infor-
mation and a motion for an arrest warrant, Kalina v. Fletcher,

, 129 (1997). By contrast, prosecutors receive
only qualified immunity for giving legal advice to the police,

, for investigating and fabricating phys-
ical evidence at a crime scene, 

(involving a bootprint left at the scene of a crime), for holding
a press conference, 

and for acting as a com-
plaining witness in support of a warrant application, 

. See also Van de 

.

   In determining the scope of the functions to which absolute
immunity extends, the Supreme Court has “generally looked
for a historical or common-law basis for the immunity in
  9
    One bright line the Supreme Court has given is that a “prosecutor nei-
ther is, nor should he consider himself to be, an advocate before he has
probable cause to have anyone arrested.” 

. The
converse, however, is not true: the mere presence of probable cause to
have someone arrested “does not guarantee a prosecutor absolute immu-
nity from liability for all actions taken afterwards.” 

n.5.
12284                AL-KIDD v. ASHCROFT
question.” 

. The existence of a
common-law immunity, however, is a necessary, but not suf-
ficient, condition for the recognition of absolute immunity:
“Even when we can identify a common-law tradition of abso-
lute immunity for a given function, we have considered
‘whether §1983’s history or purposes nonetheless counsel
against recognizing the same immunity in § 1983 actions.’ ”

(quoting Tower v. Glover, 

, 920 (1984)).

   Ashcroft contends that the decision to seek a material wit-
ness warrant is always a prosecutorial function. He has pre-
sented us with no historical evidence that a common-law tra-
dition of absolute immunity from suit for prosecutors in seek-
ing material witness arrests exists, and our own research has
uncovered none, even though the practice of detaining wit-
nesses who are not criminal suspects dates back to at least the
1840s. See generally Wesley MacNeil Oliver, The Rise and
Fall of Material Witness Detention in Nineteenth Century
New York, 1 N.Y.U. J.L. & LIBERTY 727 (2005). Other cir-
cuits, however, have held that the decision to seek a material
witness warrant to secure a witness’s testimony at trial is suf-
ficiently related to judicial proceedings to be protected by
absolute prosecutorial immunity. See Betts v. Richard, 

, 81 (2d Cir. 1984); Daniels v. Kieser, 

,
68-69 (7th Cir. 1978); see also White ex rel. Swafford v. Ger-
bitz, 

, 665 n.4 (6th Cir. 1988) (suggesting in
dicta that the decision to seek a material witness order is pro-
secutorial). But see Odd v. Malone, 

, 217 (3d
Cir. 2008) (holding “that the policies underlying the recogni-
tion of prosecutorial immunity do not apply with the same
force” to detained material witnesses because “the aggrieved
persons are unindicted third-party witnesses rather than crimi-
nal defendants”). In Betts and Daniels, the plaintiffs, who had
been previously subpoenaed as witnesses, failed to appear on
the day they were set to testify, and the prosecutor sought a
material witness warrant. 

; 

. The Seventh Circuit in Daniels held that
                     AL-KIDD v. ASHCROFT                   12285
“[b]ecause defendant was attempting to secure Daniels’ pres-
ence at the resumption of the trial, we must consider that he
was functioning as an advocate rather than as an investigator
or administrator,” and was therefore entitled to absolute

; see also 

(cit-
ing Daniels).

   Al-Kidd does not contest that absolute immunity ordinarily
attaches to the decision to seek a material witness warrant. He
contends, rather, that in his case, the decision to arrest was an
act in furtherance of an investigative or national security func-
tion, for which the Attorney General may claim only qualified
immunity. That is, al-Kidd claims he was arrested not in order
to secure his testimony at Al-Hussayen’s trial, but in order to
detain, interrogate, and gather evidence against him, in partic-
ular. He notes that, in both Betts and Daniels, there was never
any question that the material witness arrest was made for any
reason other than to secure the witnesses’ testimony at trial.

   Ashcroft responds that any investigation into the purpose or
motive behind the decision to arrest al-Kidd is inconsistent
with the “functional” approach the Supreme Court has out-
lined. However, the cases he cites in support of this proposi-
tion are distinguishable. Those cases universally involve
allegations that the otherwise prosecutorial action was
secretly motivated by malice, spite, bad faith, or self-interest.
See, e.g., Bernard v. County of Suffolk, 

, 504 (9th
Cir. 2004) (alleging “racially invidious or partisan prosecu-
tions”); Radcliffe v. Rainbow Constr. Co., 

, 779
(9th Cir. 2001) (involving prosecutor accused of initiating
prosecution in order “to deny the plaintiffs access to public
works construction job sites”); Ashelman v. Pope, 

, 1078 (9th Cir. 1986) (“To foreclose immunity upon
allegations that judicial and prosecutorial decisions were con-
ditioned upon a conspiracy or bribery serves to defeat these
policies.”). None of these cases attempts to distinguish
between a prosecutor’s investigative or national security func-
12286                     AL-KIDD v. ASHCROFT
tions and his prosecutorial functions, which is the question
here.

   [3] The cases distinguishing investigative and prosecutorial
function take into account the goal of performing an action to
determine function. In Buckley v. Fitzimmons, the Supreme
Court held that the prosecutors lacked absolute immunity for
their actions before they had probable cause to arrest a suspect
because “[t]heir mission at that time was entirely investigative
in 

. Even after a grand jury had
been empaneled, the prosecutor’s actions before it were not
shielded by absolute immunity because “its immediate pur-
pose was to conduct a more thorough investigation of the
crime—not to return an indictment against a suspect whom
there was already probable cause to arrest.” 

   This circuit has followed the Supreme Court’s instruction.
In KRL v. Moore, a grand jury had indicted the plaintiff, based
on evidence obtained from an initial search warrant, on
twenty-one criminal counts, mostly concerning environmental
infractions relating to the removal of an underground fuel
storage 

. The following month, how-
ever, prosecutors obtained two additional warrants to search
for evidence with little relevance to the charges in the indict-
ment. 

We held that the prosecutors were engaged,
at least in part, in investigative functions when they requested
  10
     Justice Kennedy would have gone even further, extending the inquiry
beyond “immediate” purpose:
    Two actors can take part in similar conduct and similar inquiries
    while doing so for different reasons and to advance different
    functions. It may be that a prosecutor and a police officer are
    examining the same evidence at the same time, but the prosecutor
    is examining the evidence to determine whether it will be persua-
    sive at trial and of assistance to the trier of fact, while the police
    officer examines the evidence to decide whether it provides a
    basis for arresting a suspect. The conduct is the same but the
    functions distinct.

(Kennedy, J., concurring in part, dissenting in part).
                         AL-KIDD v. ASHCROFT                         12287
the second and third warrants, even though they already had
probable cause as to those suspects for other crimes. We cited
the prosecutors’ investigatory purpose, which they had admit-
ted both in depositions and on a talk radio program. 

“Thus, we conclude[d] that, because the warrant . . .
was to further a ‘stand-alone investigation’ into environmen-
tal crimes, [defendants were] not entitled to absolute immu-
nity from Plaintiffs’ claim of judicial deception.” 

By contrast, “the second search warrant had two goals: it
sought evidence to prosecute the pending indictment against
Womack, and it sought to investigate and uncover new
crimes.” 

We held that “to the extent the second
search warrant sought evidence to prosecute the crimes
charged in the indictment, [defendants’] review of the warrant
prior to submission was intimately associated with the judicial
process,” and therefore entitled them to absolute immunity.

Our focus on ends, rather than the labels attached
to means, was explicit and effectively determinative.11

   Likewise, in Genzler v. Longanbach, 

, 638
(9th Cir. 2005), we noted that “[w]itness interviews may serve
either an investigative or an advocacy-related function,” and
demonstrated how that function can be inferred from the cir-
cumstances of the interviews. In that case, the timing of the
interviews, 

642, as well as the “nature of the infor-
mation obtained,” 

led us to hold that “evidence in
the record supports the conclusion that [the defendants] were
  11
    In KRL we limited our holding to search warrants, rather than arrest
warrants. 

This distinction was based on the Supreme Court’s
rule that “a prosecutor does not serve as an advocate before probable cause
to arrest anyone has been established.” Id. (citing 

). The Supreme Court has been clear that probable cause to arrest is
necessary, but not sufficient, to the prosecutorial function, and “does not
guarantee a prosecutor absolute immunity from liability for all actions
taken afterwards.” 

n.5. At any rate, this distinc-
tion in dicta does nothing to detract from the teleological inquiry that was
central to our holding.
12288                     AL-KIDD v. ASHCROFT
engaged in police-type investigative work during” the witness
interviews, 

   Indeed, Daniels and Betts, while granting absolute immu-
nity for material witness arrests, are entirely compatible with
an inquiry into immediate purpose similar to that in Genzler.
Both emphasized the close temporal and circumstantial con-
nection between trial and seeking the arrest. 

; 

. The Daniels court noted
that “[i]n seeking to guarantee Daniels’ presence at the trial
through the material witness warrant, defendant was attempt-
ing to prove all elements charged in the indictment.” 

Other circuits have likewise used the language of purpose in
determining function.13
  12
      The dissent argues that an individual’s detention on a material witness
warrant “is subject to continuing oversight, and errors may be corrected
though the judicial process[,]” and thus obviates “ ‘the need for damages
actions to prevent unjust results.’ ” Dissent at 12352 (citations omitted).
The Third Circuit has recently held the opposite, finding that the plaintiffs,
who had been detained on material witness statutes, had demonstrated the
need for damages actions because “by virtue of their status as third-party
witnesses, Plaintiffs are not entitled to the protections available to criminal
defendants, including the appellate process.” 

.
   13
      See, e.g., Guzman-Rivera v. Rivera-Cruz, 

, 30-31 (1st Cir.
1995); Parkinson v. Cozzolino, 

, 151 (2d Cir. 2001) (“There
can be little doubt that conduct taken with the goal of affirming a convic-
tion on appeal or obtaining a new conviction on re-trial falls within the tra-
ditional adversarial function of a prosecutor.” (internal quotation marks
omitted)); Hill v. City of New York, 

, 662 (2d Cir. 1995) (“To
the extent that the creation of the videotapes fulfilled an investigatory pur-
pose, Adago cannot claim absolute immunity.”); Cousin v. Small, 

, 635 (5th Cir. 2003) (“The interview was intended to secure evi-
dence that would be used in the presentation of the state’s case at the
pending trial of an already identified suspect, not to identify a suspect or
establish probable cause.”); Lomaz v. Hennosy, 

, 499 (6th
Cir. 1998) (“The purpose for which they sought the warrant, therefore,
was not primarily investigative, but was to obtain and preserve the evi-
dence. We think that under these circumstances, the prosecutors were
clearly ‘preparing for the initiation of judicial proceedings.’ ” (quoting

)); Lerwill v. Joslin, 

, 438 (10th Cir.
1983); Rivera v. Leal, 

, 1354 (11th Cir. 2004) (finding abso-
lute immunity because, inter alia, “there is no indication that Leal was try-
ing to establish probable cause to arrest Appellant. In fact, the purpose of
the hearing was to establish whether [another individual] was innocent.”).
                     AL-KIDD v. ASHCROFT                   12289
   [4] They were justified in doing so. Even were we not con-
strained by our precedents in KRL and Genzler, the Supreme
Court, in adopting a “functional” test, has necessarily required
us to look beyond the labels a prosecutor attaches to his or her
actions and examine their underlying ends. The very word
function reflects, at least in part, a teleological perspective.
See, e.g., Oxford English Dictionary, Function (2d ed. 1989)
(defining “function” as “[t]he special kind of activity proper
to anything; the mode of action by which it fulfils its pur-
pose”). In Buckley, the Supreme Court found it proper to
inquire into the prosecutor’s mission and purpose, the very
inquiry that Ashcroft and the dissent in this case find distaste-

.

   Ashcroft’s suggested approach, by contrast, would convert
the Supreme Court’s functional approach into a formalistic
taxonomy of acts that are inherently either prosecutorial or
investigative, regardless of what each act is really serving to
accomplish. Because the application for the arrest warrant had
the words “Material Witness” in the caption, Ashcroft seems
to contend, our inquiry must stop there. Our dissenting col-
league agrees, and would hold that so long as a material wit-
ness warrant is sought pursuant to a criminal trial, the
decision to seek the material witness warrant should always
be shielded by absolute immunity, regardless of whether its
purpose was purely investigative. Dissent at 12351.

   We disagree. Many tools and tactics available to prosecu-
tors can serve either an investigatory or advocacy-related
function. A grand jury may be used to return an indictment
against a particular suspect, or to conduct a wide-ranging
investigation. 

. A witness interview’s
function may be to gather evidence, or to prepare the witness
to testify at imminent trial. 

. And the
power to arrest, even as a material witness, can be investiga-
tory. As cited in al-Kidd’s complaint, Michael Chertoff, then
Assistant Attorney General for the DOJ’s Criminal Division,
described the material witness statute as “an important investi-
12290                     AL-KIDD v. ASHCROFT
gative tool in the war on terrorism . . . . Bear in mind that you
get not only testimony—you get fingerprints, you get hair
samples—so there’s all kinds of evidence you can get from a
witness.” Steve Fainaru & Margot Williams, Material Witness
Law Has Many in Limbo: Nearly Half Held in War On Terror
Haven’t Testified, Wash. Post, Nov. 24, 2002, at A1 (quoting
Chertoff) (emphasis added).

   Ashcroft argues that an inquiry into purpose cannot be cab-
ined: a prosecutor filing charges against a foot soldier in an
organized crime syndicate, for example, might hope that the
prospect of a lengthy incarceration will encourage the defen-
dant to turn state’s evidence, permitting investigation of those
higher in the organization. A wide-ranging investigation into
such motives would likely prove unworkable. It is for that
reason that the Supreme Court has spoken only of “immediate
purpose.” 

(emphasis added). As a
common law court, we can rule only on the case before us.
We believe, however, that while the prosecutor who files
charges may hope, eventually, that the petty crook will impli-
cate his boss, the immediate purpose of filing charges is to
begin a prosecution—the better to pressure the defendant into
providing information.

   [5] We hold, therefore, that when a prosecutor seeks a
material witness warrant in order to investigate or preemp-
tively detain a suspect, rather than to secure his testimony at
another’s trial, the prosecutor is entitled at most to qualified,
rather than absolute, immunity.14 We emphasize that our hold-
  14
     The dissent believes that such an inquiry is undesirable because of the
incentives it creates. Dissent at 12358. Judge Bea states that our inquiry
may make a prosecutor go to trial against a defendant simply to ensure his
actions will not be subject to attack in a future lawsuit. We disagree. First,
prosecutors often make choices regarding prosecutorial strategy that may
be in tension with personal liability, see 

, since
all actions taken by a prosecutor are not entitled to absolute immunity.
Second, we note that creating an incentive for a prosecutor to utilize a
material witness he/she has detained for the very purpose alleged in his/
her affidavit is not an undesirable incentive, and certainly not dispositive
to the immediate purpose inquiry.
                     AL-KIDD v. ASHCROFT                  12291
ing here does not rest upon an unadorned assertion of secret,
unprovable motive, as the dissent seems to imply. Even
before the Supreme Court’s decision in Bell Atlantic v. Twom-
bly and Ashcroft v. Iqbal, it was likely that conclusory allega-
tions of motive, without more, would not have been enough
to survive a motion to dismiss. See, e.g., Sprewell v. Golden
State Warriors, 

, 988 (9th Cir. 2001) (facts pled
must be accepted as true, but conclusory allegations need not
be). Twombly’s general requirement that “[f]actual allegations
must be enough to raise a right to relief above the speculative
level,” 

, applies with equal force to allegations
that a prosecutor’s actions served an investigatory function. In
this case, however, al-Kidd has averred ample facts to render
plausible the allegation of an investigatory function:

    •   Al-Kidd’s arrest was sought a month after Al-
        Hussayen was indicted, and more than a year
        before trial began, temporally distant from the
        time any testimony would have been needed. See
        

(“The timing of evi-
        dence gathering is a relevant fact in determining
        how closely connected that conduct is to the offi-
        cial’s core advocacy function . . . .”). Cf. 

(arrest warrant issued day of trial);
        

(same).

    •   The FBI had previously investigated and inter-
        viewed al-Kidd, but had never suggested, let
        alone demanded, that he appear as a witness. Cf.
        

(subpoena issued; prosecu-
        tor called witness day before trial to remind her
        that trial was to begin the next day); 

(plaintiff had already been served one
        subpoena; second subpoena was misplaced by
        U.S. Marshal).

    •   The FBI conducted lengthy interrogations with
        al-Kidd while in custody, including about matters
12292                 AL-KIDD v. ASHCROFT
         apparently unrelated to Al-Hussayen’s alleged
         visa violations. Cf. 

         (nature of questions asked witnesses relevant to
         whether interview served investigative function).

     •   Al-Kidd never actually testified for the prosecu-
         tion in Al-Hussayen’s or any other case, despite
         his assurances that he would be willing to do so.
         Cf. 

(“On Monday morning
         the trial proceeded and the prosecutor called
         plaintiff as his first witness.”); 

(“Plaintiff subsequently testified as a gov-
         ernment witness when Phoenix’s trial resumed.”).

All of these are objective indicia, similar to those we cited in

, that al-Kidd’s arrest functioned
as an investigatory arrest or national security-related preemp-
tive detention, rather than as one to secure a witness’s testi-
mony for trial. Finally:

     •   Ashcroft’s immediate subordinate, FBI Director
         Mueller, testified before Congress that al-Kidd’s
         arrest (rather than, say, the obtaining of the evi-
         dence he was supposedly going to provide
         against Al-Hussayen) constituted a “major suc-
         cess[ ]” in “identifying and dismantling terrorist
         networks.” Mueller 

. Cf. 

(prosecutor contemporane-
         ously admits on radio program that follow-up
         search warrant was part of “a stand-alone investi-
         gation”).

We conclude that the practice of detaining a material witness
in order to investigate him, on the facts alleged by al-Kidd,
fulfils an investigative function.

B.   Qualified Immunity

  The Attorney General may still be entitled to qualified
immunity for acts taken in furtherance of an investigatory or
                     AL-KIDD v. ASHCROFT                   12293
national security function. Before addressing each of al-
Kidd’s claims in turn, we address the general requirements of
qualified immunity applicable to all his claims.

  1.   Qualified Immunity Generally

   Determining whether officials are owed qualified immunity
involves two inquiries: (1) whether, taken in the light most
favorable to the party asserting the injury, the facts alleged
show the officer’s conduct violated a constitutional right; and
(2) if so, whether the right was clearly established in light of
the specific context of the case. Saucier v. Katz, 

,
201 (2001). “For a constitutional right to be clearly estab-
lished, its contours must be sufficiently clear that a reasonable
official would understand that what he is doing violates that
right.” Hope v. Pelzer, 

, 739 (2002) (internal
quotation marks omitted). It is within our “sound discretion”
to address these two prongs in any sequence we see fit. Pear-
son v. Callahan, ___ U.S. ___, 

, 818 (2009).
Here, we apply the two-step Saucier analysis in the traditional
sequence, as this sequence “promotes the development of
constitutional precedent,” which is especially valuable in
addressing constitutional questions such as the one at hand,
“that do not frequently arise in cases in which a qualified
immunity defense is unavailable.” 

  2.   Qualified Immunity for Supervisors

   Because qualified immunity is “an immunity from suit
rather than a mere defense to liability,” 

, courts have also evaluated the sufficiency of the allega-
tions of the defendant’s personal involvement in the depriva-
tion of the right at the second stage of the qualified immunity
analysis. Neither a 42 U.S.C. § 1983 nor a Bivens action will
hold a supervisor strictly vicariously liable for the actions of
his subordinates under a theory of respondeat superior. 

. Although this question is a part of the sub-
12294                 AL-KIDD v. ASHCROFT
stance of § 1983 and Bivens liability, it is also a proper com-
ponent of the qualified immunity inquiry:

    In conducting qualified immunity analysis . . . ,
    courts do not merely ask whether, taking the plain-
    tiff’s allegations as true, the plaintiff’s clearly estab-
    lished rights were violated. Rather, courts must
    consider as well whether each defendant’s alleged
    conduct violated the plaintiff’s clearly established
    rights. For instance, an allegation that Defendant A
    violated a plaintiff’s clearly established rights does
    nothing to overcome Defendant B’s assertion of
    qualified immunity, absent some allegation that
    Defendant B was responsible for Defendant A’s con-
    duct.

n.9 (Thomas, J., dissenting). In Kwai
Fun Wong v. United States, we, on interlocutory appeal, dis-
missed part of a Bivens action for failure to state a claim
where the complaint “fail[ed] to identify what role, if any,
each individual defendant had in placing [the plaintiff] in

.

   Al-Kidd’s complaint does not allege that Ashcroft was
directly involved in the decision to detain al-Kidd. But “di-
rect, personal participation is not necessary to establish liabil-
ity for a constitutional violation.” 

be held
liable for the actions of their subordinates (1) for setting in
motion a series of acts by others, or knowingly refusing to ter-
minate a series of acts by others, which they knew or reason-
ably should have known would cause others to inflict
constitutional injury; (2) for culpable action or inaction in
training, supervision, or control of subordinates; (3) for acqui-
escence in the constitutional deprivation by subordinates; or
(4) for conduct that shows a “reckless or callous indifference
to the rights of others.” Larez v. City of Los Angeles, 

, 646 (9th Cir. 1991) (internal quotation marks omitted).
                        AL-KIDD v. ASHCROFT                      12295
Any one of these bases will suffice to establish the personal
involvement of the defendant in the constitutional violation.

  3.        The Fourth Amendment Claim

   Al-Kidd’s complaint principally alleges that Ashcroft “de-
veloped, implemented and set into motion a policy and/or
practice under which the FBI and DOJ would use the material
witness statute to arrest and detain terrorism suspects about
whom they did not have sufficient evidence to arrest on crimi-
nal charges but wished to hold preventively or to investigate
further.” Al-Kidd argues that using § 3144 to detain suspects
to investigate them violates the Fourth Amendment’s guaran-
tee against unreasonable seizure.

       a.    Al-Kidd’s Fourth Amendment Rights Were Violated.

   [6] The Fourth Amendment to the United States Constitu-
tion provides:

       The right of the people to be secure in their persons
       . . . against unreasonable searches and seizures, shall
       not be violated, and no Warrants shall issue, but
       upon probable cause, supported by Oath or affirma-
       tion, and particularly describing the place to be
       searched, and the persons or things to be seized.

We have previously held that material witness arrests are “sei-
zures” within the meaning of the Fourth Amendment and are
therefore subject to its reasonableness requirement. Bacon v.
United States, 

, 942 (9th Cir. 1971).

  The Supreme Court has never held that detention of inno-
cent persons as material witnesses is permissible under the
Fourth Amendment,15 and this circuit, in one of the few
  15
    Two decisions have held that it does not violate other provisions of
the Constitution. See Hurtado v. United States, 

, 589-90
12296                     AL-KIDD v. ASHCROFT
circuit-level cases to examine the validity of material witness
detentions under the Fourth Amendment, declined to reach
the facial constitutionality of the predecessor of § 3144. 

Al-Kidd does not contend that § 3144 is facially uncon-
stitutional. Rather, he contends that it is intended to be a “lim-
ited exception” to the ordinary rule that arrests may only be
made upon probable cause of criminal wrongdoing. He fur-
ther claims that its use for any purpose other than obtaining
testimony, and specifically to investigate or preemptively
detain terrorism suspects, without probable cause, is unconsti-
tutional. Ashcroft contends that this position is inconsistent
with Whren v. United States’s rule that “[s]ubjective inten-
tions play no role in ordinary, probable-cause Fourth Amend-
ment analysis.” 

, 813 (1996). But arrests of
material witnesses are neither “ordinary,”16 nor involve “prob-
able cause” as that term has historically been understood.

(1973) (Fifth and Thirteenth Amendments); New York v. O’Neill, 

, 6-7 (1959) (Privileges or Immunities Clause of the Fourteenth Amend-
ment). Dicta in two other cases suggest that the practice is ordinarily per-
missible. See Stein v. New York, 

, 184 (1953), overruled by
Jackson v. Denno, 

(1964) (“The duty to disclose knowledge
of crime rests upon all citizens. It is so vital that one known to be innocent
may be detained, in the absence of bail, as a material witness.”); Barry v.
United States ex rel. Cunningham, 

, 616-17 (1929) (“[A]
court has power in the exercise of a sound discretion to issue a warrant of
arrest without a previous subpoena when there is good reason to believe
that otherwise the witness will not be forthcoming. . . . The constitutional-
ity of this statute apparently has never been doubted.”).
   16
      In 2003, the year of al-Kidd’s arrest, material witness arrests made up
only 3.6% of all arrests by federal law enforcement agents. Of those,
92.3% were made by the former Immigration and Naturalization Service,
typically to detain illegally smuggled aliens for testimony against their
smugglers before removal. See, e.g., Aguilar-Ayala v. Ruiz, 

(5th Cir. 1992). Less than 0.3% of arrests by non-immigration federal law
enforcement agents were material witness arrests. See Bureau of Justice
Statistics, U.S. Dep’t of Justice, Compendium of Federal Justice Statistics,
2003, NCJ No. 210299 (2005), available at http://www.ojp.usdoj.gov/bjs/
pub/pdf/cfjs0301.pdf, at 18.
                     AL-KIDD v. ASHCROFT                  12297
   [7] Whren rejected only the proposition that “ulterior
motives can invalidate police conduct that is justifiable on the
basis of probable cause to believe that a violation of law has
occurred.” 

(emphasis added). Indeed, probable
cause, since before the founding, has always been a term of
art of criminal procedure. As Chief Justice Marshall wrote:

    [T]he term “probable cause,” according to its usual
    acceptation, means less than evidence which would
    justify condemnation; and, in all cases of seizure, has
    a fixed and well known meaning. It imports a seizure
    made under circumstances which warrant suspicion.
    In this, its legal sense, the Court must understand the
    term to have been used by Congress.

Locke v. United States, 11 U.S. (7 Cranch) 339, 348 (1813).
Its most famous modern formulation comes from Justice
Stewart’s opinion in Beck v. Ohio:

    Whether that arrest was constitutionally valid
    depends in turn upon whether, at the moment the
    arrest was made, the officers had probable cause to
    make it—whether at that moment the facts and cir-
    cumstances within their knowledge and of which
    they had reasonably trustworthy information were
    sufficient to warrant a prudent man in believing that
    the petitioner had committed or was committing an
    offense.

, 91 (1964). This definition has been reiterated in
Supreme Court cases over the decades:

    This Court repeatedly has explained that “probable
    cause” to justify an arrest means facts and circum-
    stances within the officer’s knowledge that are suffi-
    cient to warrant a prudent person, or one of
    reasonable caution, in believing, in the circum-
12298                    AL-KIDD v. ASHCROFT
     stances shown, that the suspect has committed, is
     committing, or is about to commit an offense.

Michigan v. DeFillippo, 

, 37 (1979); see also
Atwater v. City of Lago Vista, 

, 354 (2001) (“If
an officer has probable cause to believe that an individual has
committed even a very minor criminal offense in his presence,
he may, without violating the Fourth Amendment, arrest the
offender.”). Probable cause has both a burden-of-proof com-
ponent (facts sufficient to make a reasonable person believe
. . . ) and a substantive component ( . . . that the suspect is
involved in crime). “The substance of all the definitions of
probable cause is a reasonable ground for belief of guilt.”
Brinegar v. United States, 

, 175 (1949) (citations
and quotation marks omitted). An arrest of a material witness
is not justified by probable cause because the two require-
ments of § 3144 (materiality and impracticability) do not con-
stitute the elements of a crime.17

   The dissent disputes this traditional definition of probable
cause, contending that no substantive component exists and
that Zurcher v. Stanford Daily, 

(1978), prevents
an inquiry into whether wrongdoing has occurred. Dissent at
12338. The dissent misreads Zurcher and confuses the differ-
ent requirements for probable cause in situations for the sei-
zure of a person and the probable cause required for a search
warrant. As Zurcher explains, “while probable cause for arrest
requires information justifying a reasonable belief that a crime
has been committed and that a particular person committed it,
a search warrant may be issued on a complaint which does not
identify any particular person as the likely offender.” 

n.6. Thus, the dissent’s analogy to Zurcher is inapplica-
ble, and nothing in our holding here contravenes Zurcher.
   17
      One may commit a crime by ignoring or disobeying a subpoena. 18
U.S.C. § 401(3) (authorizing criminal contempt for “[d]isobedience or
resistance to [a court’s] lawful writ, process, order, rule, decree, or com-
mand”). This was not the case here, where al-Kidd does not ever seem to
have been subpoenaed.
                          AL-KIDD v. ASHCROFT                          12299
   Further, our decision in Bacon v. United States is not to the
contrary. In Bacon, we held that the two criteria for arrest in
the predecessor of § 3144, materiality of the witness’s testi-
mony and impracticability of securing the witness’s testimony
by subpoena, must be met by “probable cause” to arrest the
material 

.18 We stated that “[t]hese
requirements are reasonable, and if they are met, an arrest
warrant may issue.” 

be read for the proposi-
tion that this alone satisfies the “probable cause” requirement
of the Fourth Amendment, however, and even if it could, such
a reading has been superseded by the dozens of subsequent
Supreme Court reaffirmations of the traditional definition of
probable cause. Rather, Bacon simply borrowed, by analogy,
some of the procedural protections traditionally afforded to
criminal suspects, including the burden-of-proof component
of probable cause. We therefore required that the elements of
the material witness statute be shown by “probable cause,”
not because that, in itself, satisfies the Fourth Amendment’s
“probable cause” requirement, but because permitting arrests
only upon establishing the elements by that burden of proof
was “reasonable” under the Fourth Amendment. 

petitioner in Bacon was detained as a material witness in a grand
jury proceeding. We stated that “a mere statement by a responsible offi-
cial, such as the United States Attorney, is sufficient to satisfy” the materi-
ality criterion in the case of a witness for a grand jury, which maintains
broad powers of investigation and whose proceedings are 

. Bacon reserved the question of what showing is necessary “in the
case of a witness who is to testify at a trial.” 

see no rea-
son that the showing of materiality as to the witness in a trial, where pro-
ceedings are public and bound by the charges in the indictment, should be
any different from the showing required for impracticability.
   Because Al-Hussayen had already been indicted by the time of al-
Kidd’s arrest, we do not address whether Bacon’s statement that grand
juries are “criminal proceedings” within the meaning of the material wit-
ness statute was a holding or obiter dicta. Compare Awadallah I, 202 F.
Supp. 2d at 71 (holding the Bacon language to be dicta because it was
unnecessary to the conclusion that the affidavit was insufficient to show
impracticability), with In re Application for a Material Witness Warrant,

, 291 (S.D.N.Y. 2002) (finding the same language to
be a holding).
12300                AL-KIDD v. ASHCROFT
   [8] Because material witness arrests are seizures without
suspicion of wrongdoing, the Whren rule, that subjective
motivation is irrelevant in the presence of probable cause,
does not apply to our Fourth Amendment analysis in this case.
In City of Indianapolis v. Edmond, the Supreme Court struck
down motor vehicle checkpoints set up “to interdict unlawful
drugs” carried by those stopped. 

, 35 (2000). The
Court explained that “programmatic purposes may be relevant
to the validity of Fourth Amendment intrusions undertaken
pursuant to a general scheme without individualized suspi-
cion. Accordingly, Whren does not preclude an inquiry into
programmatic purpose in such contexts.” 

The
Court went on to clarify:

    our cases dealing with intrusions that occur pursuant
    to a general scheme absent individualized suspicion
    have often required an inquiry into purpose at the
    programmatic level.

       . . . [W]e examine the available evidence to deter-
    mine the primary purpose of the checkpoint pro-
    gram. While we recognize the challenges inherent in
    a purpose inquiry, courts routinely engage in this
    enterprise in many areas of constitutional jurispru-
    dence as a means of sifting abusive governmental
    conduct from that which is lawful. As a result, a pro-
    gram driven by an impermissible purpose may be
    proscribed while a program impelled by licit pur-
    poses is permitted, even though the challenged con-
    duct may be outwardly similar. While
    reasonableness under the Fourth Amendment is pre-
    dominantly an objective inquiry, our special needs
    and administrative search cases demonstrate that
    purpose is often relevant when suspicionless intru-
    sions pursuant to a general scheme are at issue.

(citation omitted).
                          AL-KIDD v. ASHCROFT                        12301
   [9] Edmond, therefore, establishes that “programmatic pur-
pose” is relevant to Fourth Amendment analysis of programs
of seizures without probable cause.19 It further establishes that
if that programmatic purpose is criminal investigation, it is
fatal to the program’s constitutionality: “the constitutional
defect of the program is that its primary purpose is to advance
the general interest in crime control.” 

The following
year’s Ferguson v. City of Charleston held unconstitutional a
program of mandatory drug testing of maternity patients
because “the immediate objective of the searches was to gen-
erate evidence for law enforcement purposes” against the
women tested. 

, 83 (2001). By contrast, in Illinois
v. Lidster, the Court upheld seizures at a motor vehicle check-
point set up by the police a week after a hit-and-run accident,
“at about the same time of night and at about the same place”
as the accident, where the checkpoint was “designed to obtain
more information about the accident from the motoring pub-
lic.” 

, 422 (2004). The Court in Lidster distin-
guished the seizure in Edmond on the basis that, in Lidster:

       the stop’s primary law enforcement purpose was not
       to determine whether a vehicle’s occupants were
       committing a crime, but to ask vehicle occupants, as
       members of the public, for their help in providing
       information about a crime in all likelihood commit-
  19
     The dissent contends that United States v. Villamonte-Marquez, 

(1983), does not allow such a broad reading of Edmond. Dissent
at 12340-41. Villamonte-Marquez, however, is factually limited to
searches of sea vessels located in waters providing ready access to the
open 

(“[W]e are concerned only with the more nar-
row issue” of whether “the Fourth Amendment is offended when Customs
officials . . . board for inspection of documents a vessel that is located in
waters providing ready access to the open sea”). The Supreme Court has
expressly distinguished searches of such sea vessels from other types of
searches—those of automobiles on land, for example. 

Only
under the most contorted reading of Villamonte-Marquez would that case
also apply to the pretextual detention of a person under a material witness
statute.
12302                     AL-KIDD v. ASHCROFT
       ted by others. The police expected the information
       elicited to help them apprehend, not the vehicle’s
       occupants, but other individuals.

As Justice Stevens wrote in concurrence, “[t]here
is a valid and important distinction between seizing a person
to determine whether she has committed a crime and seizing
a person to ask whether she has any information about an
unknown person who committed a crime a week earlier.” 

(Stevens, J., concurring in part, dissenting in part).20
That is precisely the distinction at work here, and the reason
we hold that Ashcroft’s policy as alleged was unconstitu-
tional.

   [10] Al-Kidd alleges that he was arrested without probable
cause pursuant to a general policy, designed and implemented
by Ashcroft, whose programmatic purpose was not to secure
testimony, but to investigate those detained. Assuming that
allegation to be true, he has alleged a constitutional violation.
Contrary to the dissent’s alarmist claims, we are not probing
into the minds of individual officers at the scene; instead, we
are inquiring into the programmatic purpose of a general pol-
icy as contemplated by 

, and finding
that the purpose of the policy alleged in al-Kidd’s first
  20
     We are mindful of the difference between a traffic stop and a material
witness arrest. The material witness is subject to a seizure an order of
magnitude greater than that at issue in Lidster, where the stops were
“brief,” and were of drivers in their cars. (As the Court noted, the “Fourth
Amendment does not treat a motorist’s car as his 

.)
An individual seized as a material witness is taken from her home and
daily affairs and confined to a small space for a period of time measured
not in minutes or even hours, but ranging from days to months. Al-Kidd
disclaims any attack on material witness detention generally, and we are
in any event bound by Bacon’s determination that the material witness
statute, backed by a “probable cause” requirement to guarantee particular-
ity, has struck a “reasonable” balance between the witness’s interest in lib-
erty and the government’s need for testimony. But the severity of the
deprivation of liberty in material witness arrests only militates for corre-
spondingly more severe judicial scrutiny of its application.
                     AL-KIDD v. ASHCROFT                  12303
amended complaint impermissible under the Fourth Amend-
ment.

   [11] Further, the dissent’s assertion that we are suggesting
“the only governmental interest of sufficient weight to justify
an arrest is a reasonable belief that the arrestee has committed
a crime” grossly mischaracterizes our holding. Dissent at
12336. To the contrary, we recognize that when the material
witness statute is genuinely used to secure “testimony of a
person . . . material in a criminal proceeding” because “it is
shown that it may become impracticable to secure the pres-
ence of the person by subpoena,” 18 U.S.C. § 3144, a show-
ing of probable cause is not required. Our holding does
nothing to curb the use of the material witness statute for its
stated purpose. What we do hold is that probable cause—
including individualized suspicion of criminal wrongdoing—
is required when 18 U.S.C. § 3144 is not being used for its
stated purpose, but instead for the purpose of criminal investi-
gation. We thus do not render the material witness statute
“entirely superfluous,” dissent at 12339; it is only the misuse
of the statute, resulting in the detention of a person without
probable cause for purposes of criminal investigation, that is
repugnant to the Fourth Amendment.

   [12] All seizures of criminal suspects require probable
cause of criminal activity. To use a material witness statute
pretextually, in order to investigate or preemptively detain
suspects without probable cause, is to violate the Fourth
Amendment. Accord Awadallah 

(“[I]t
would be improper for the government to use § 3144 for other
ends, such as the detention of persons suspected of criminal
activity for which probable cause has not yet been estab-
lished.”).

    b.   Al-Kidd’s Right Was “Clearly Established.”

  Ashcroft alternatively contends that if we conclude that the
use of material witness orders for investigatory purposes vio-
12304                AL-KIDD v. ASHCROFT
lates the Constitution, we should still grant him qualified
immunity because that constitutional right was not “clearly
established” in March 2003, when al-Kidd was arrested. We
disagree.

   In March 2003, no case had squarely confronted the ques-
tion of whether misuse of the material witness statute to
investigate suspects violates the Constitution. Both the com-
plaint and Amici Former Federal Prosecutors note the unprec-
edented nature of Ashcroft’s alleged material witness policy,
and thus it is unsurprising that published cases directly on
point are lacking. However, this alone is not enough to give
Ashcroft immunity: “ ‘while there may be no published cases
holding similar policies [un]constitutional, this may be due
more to the obviousness of the illegality than the novelty of
the legal issue.’ ” Moreno v. Baca, 

, 641 (9th
Cir. 2005) (quoting Sorrels v. McKee, 

, 970 (9th
Cir. 2002)). Indeed, as the Supreme Court has stated:

    For a constitutional right to be clearly established, its
    contours “must be sufficiently clear that a reasonable
    official would understand that what he is doing vio-
    lates that right. This is not to say that an official
    action is protected by qualified immunity unless the
    very action in question has previously been held
    unlawful; but it is to say that in the light of pre-
    existing law the unlawfulness must be apparent.”

(quoting Anderson v. Creighton, 

, 640 (1987)) (internal citations omitted). “[O]fficials
can still be on notice that their conduct violates established
law even in novel factual circumstances.” 

  What was clearly established in March 2003? No federal
appellate court had yet squarely held that the federal material
witness statute satisfied the requirements of the Fourth
Amendment. Even our decision in Bacon held only that it was
unconstitutional as applied to the 

.
                         AL-KIDD v. ASHCROFT                         12305
What obiter dicta existed on material witness detention, how-
ever, clearly linked its justification only to the state’s overrid-
ing need to compel testimony in criminal cases.21 Even dicta,
if sufficiently clear, can suffice to “clearly establish” a consti-
tutional right. See 

. But there is
more.

   [13] The definition of probable cause, as set forth in Beck
v. Ohio, was certainly clearly established. While the Supreme
Court’s decision permitting suspicionless seizures in some
circumstances in Lidster had not yet been decided, its decision
in Edmond, stating that an investigatory programmatic pur-
pose renders a program of seizures without probable cause
unconstitutional, had been decided two and a half years ear-

. That holding was reaffirmed the follow-
ing year in 

, which highlighted
the close connection between the investigative “programmatic
purpose” and the search scheme that was ruled unconstitu-
tional. Those decisions, which emphasized that an investiga-
tory programmatic purpose would invalidate a scheme of
searches and seizures without probable cause, should have
been sufficient to put Ashcroft on notice that the material wit-
ness detentions—involving a far more severe seizure than a
   21
      See, e.g., 

(1953) (“The duty to disclose knowl-
edge of crime rests upon all citizens. It is so vital that one known to be
innocent may be detained, in the absence of bail, as a material witness.”);

(stating that the material witness statute then in
effect “provides that any federal judge . . . may have [material witnesses]
brought before him by a warrant of arrest, to give recognizance, and that
such person may be confined until removed for the purpose of giving his
testimony”) (emphasis added); 

(“The public inter-
est [in detaining witnesses] will be protected if grand jury witnesses come
forth to provide testimony concerning the possible commission of
crimes.”); Awadallah 

(“The only legitimate reason
to detain a grand jury witness is to aid in ‘an ex parte investigation to
determine whether a crime has been committed and whether criminal pro-
ceedings should be instituted against any person.’ ” (quoting United States
v. Calandra, 

, 343-44 (1974))).
12306                AL-KIDD v. ASHCROFT
mere traffic stop—would be similarly subject to an inquiry
into programmatic purpose.

  Moreover, the history and purposes of the Fourth Amend-
ment were known well before 2003:

    The central importance of the probable-cause
    requirement to the protection of a citizen’s privacy
    afforded by the Fourth Amendment’s guarantees
    cannot be compromised in this fashion. “The
    requirement of probable cause has roots that are deep
    in our history.” Hostility to seizures based on mere
    suspicion was a prime motivation for the adoption of
    the Fourth Amendment, and decisions immediately
    after its adoption affirmed that “common rumor or
    report, suspicion, or even ‘strong reason to suspect’
    was not adequate to support a warrant for arrest.”

Dunaway v. New York, 

, 213 (1979) (quoting
Henry v. United States, 

, 100-01 (1959)) (internal
citation omitted). The Fourth Amendment “reflect[s] the
determination of those who wrote the Bill of Rights that the
people of this new Nation should forever ‘be secure in their
persons, houses, papers, and effects’ from intrusion and sei-
zure by officers acting under the unbridled authority of a gen-
eral warrant.” Stanford v. Texas, 

, 481 (1965).

   The facts alleged of al-Kidd’s arrest, that he was arrested
because he was associated with the webmaster of an allegedly
jihadist website, demonstrate the continued relevance of the
Founders’ concerns. The Fourth Amendment was, in large
measure, a direct response to the so-called “Wilkes cases.” As
summarized by the Supreme Court:

    The Wilkes case arose out of the Crown’s attempt to
    stifle a publication called The North Briton, anony-
    mously published by John Wilkes, then a member of
    Parliament—particularly issue No. 45 of that journal.
                     AL-KIDD v. ASHCROFT                   12307
    Lord Halifax, as Secretary of State, issued a warrant
    ordering four of the King’s messengers “to make
    strict and diligent search for the authors, printers,
    and publishers of a seditious and treasonable paper,
    entitled, The North Briton, No. 45, * * * and them,
    or any of them, having found, to apprehend and
    seize, together with their papers.” “Armed with their
    roving commission, they set forth in quest of
    unknown offenders; and unable to take evidence, lis-
    tened to rumors, idle tales, and curious guesses.
    They held in their hands the liberty of every man
    whom they were pleased to suspect.” Holding that
    this was “a ridiculous warrant against the whole
    English nation,” the Court of Common Pleas
    awarded Wilkes damages against the Secretary of
    State.

(alteration in original) (footnotes omitted). Within
three days of the issuance of Halifax’s general warrants, forty-
nine people had been arrested, none of whom was named in
the warrant, but all of whom were alleged associates of the
allegedly seditious pamphleteer. Nelson B. Lasson, The
Fourth Amendment to the Constitution 43-44 (1937). The
warrant authorizing al-Kidd named him in particular, and so
was not a general warrant in that sense. But the result was the
same: gutting the substantive protections of the Fourth
Amendment’s “probable cause” requirement and giving the
state the power to arrest upon the executive’s mere suspicion.

   Finally, months before al-Kidd’s arrest, one district court in
a high-profile case had already indicated, in the spring of
2002, that § 3144 itself should not be abused as an investiga-
tory anti-terrorism tool, calling out Ashcroft by name:

    Other reasons may motivate prosecutors and law
    enforcement officers to rely upon the material wit-
    ness statute. Attorney General John Ashcroft has
    been reported as saying: “Aggressive detention of
12308                     AL-KIDD v. ASHCROFT
       lawbreakers and material witnesses is vital to pre-
       venting, disrupting or delaying new attacks.” Relying
       on the material witness statute to detain people who
       are presumed innocent under our Constitution in
       order to prevent potential crimes is an illegitimate
       use of the statute. If there is probable cause to
       believe an individual has committed a crime or is
       conspiring to commit a crime, then the government
       may lawfully arrest that person, but only upon such
       a showing.

Awadallah 

n.28 (citation omitted,
first emphasis added). The statement was dicta in a footnote
of a district court opinion. But it was categorical, and it
addressed exactly what al-Kidd alleges happened ten months
after the opinion was first issued. It is difficult to imagine
what, in early 2003,22 might have given John Ashcroft “fair-
[er] warning” that he could be haled into court for his alleged
material witness policies. 

.

   [14] We therefore hold that al-Kidd’s right not to be
arrested as a material witness in order to be investigated or
preemptively detained was clearly established in 2003.
Although Ashcroft has raised in this appeal neither a national
security nor an exigency defense to al-Kidd’s action, we note
that we are mindful of the pressures under which the Attorney
General must operate. We do not intend to “dampen the ardor
of all but the most resolute, or the most irresponsible, in the
  22
    Mr. Awadallah was detained shortly after the September 11 attacks.
Awadallah 

(Sept. 20, 2001). He sought his release
almost immediately. 

(Sept. 25, 2001). By April of 2003, his case
had finally reached the court of appeals. Given the speed of our appellate
process, it would have been almost impossible for any authority higher
than a district court to have opined on defendant’s material witness poli-
cies before March 2003. As noted above, the Second Circuit later indi-
cated, in dicta of its own, its agreement with the district court’s statement
on this question, even as it reversed the district court’s holding and
remanded the case. 

                        AL-KIDD v. ASHCROFT                  12309
unflinching discharge of their duties.” Gregoire v. Biddle, 

, 581 (2d Cir. 1949). But, as the Supreme Court has
aptly noted, qualified immunity must

       not allow the Attorney General to carry out his
       national security functions wholly free from concern
       for his personal liability; he may on occasion have to
       pause to consider whether a proposed course of
       action can be squared with the Constitution and laws
       of the United States. But this is precisely the point
       of the Harlow standard: “Where an official could be
       expected to know that his conduct would violate stat-
       utory or constitutional rights, he should be made to
       hesitate . . . .” This is as true in matters of national
       security as in other fields of governmental action.
       We do not believe that the security of the Republic
       will be threatened if its Attorney General is given
       incentives to abide by clearly established law.

(quoting 

)
(internal citations omitted).

  4.     The § 3144 Claim

   In addition to alleging that Ashcroft misused § 3144 for
unconstitutional purposes the statute did not intend, al-Kidd
alleges that his arrest violated the terms of § 3144 itself. Sec-
tion 3144 authorizes the arrest of material witnesses only if
(1) “the testimony of a person is material in a criminal pro-
ceeding,” and (2) “it may become impracticable to secure the
presence of the person by subpoena.” Bacon v. United States
requires that these elements be shown by presenting the judi-
cial officer with an affidavit showing “the underlying facts or
circumstances from which the judicial officer could find prob-
able 

. Al-Kidd claims that, in his case,
the Mace Affidavit fails to demonstrate probable cause for
either the materiality of his testimony or the reasons it would
be impracticable to secure that testimony by subpoena. This
12310                AL-KIDD v. ASHCROFT
allegation is the § 3144 claim: that, independent of the consti-
tutionality of the use of § 3144 for investigatory purposes, al-
Kidd’s arrest failed to meet the statutory requirements set
forth by Congress, and was therefore unlawful.
AL-KIDD v. ASHCROFT           12311
                      Volume 2 of 2
12312                    AL-KIDD v. ASHCROFT
   Although the arrest was conducted pursuant to a warrant
issued by a magistrate judge, we allow challenges to the
validity of searches and seizures conducted pursuant to a war-
rant if the affidavit in support of the warrant included false
statements or material omissions that were made intentionally
or recklessly. See Franks v. Delaware, 

, 155-56
(1978); United States v. Stanert, 

, 781 (9th Cir.
1985) (extending Franks to material omissions); see also
Awadallah 

& n.17 (assuming, without
deciding, that Franks applies to a material witness warrants
and conducting the Franks analysis). Ashcroft does not con-
test that such an inquiry would be appropriate, or that reckless
or intentional misstatements or omissions could, if proven,
constitute a valid claim of the violation of a clearly estab-
lished right. Rather, he argues that al-Kidd has not pled suffi-
cient acts or omissions to establish supervisory liability for
the § 3144 Claim.23

   Prior to Bell Atlantic Company v. Twombly, 

,
we held that a plaintiff “does not need to show with great
specificity how each defendant contributed to the violation of
his constitutional rights. Rather, he must state the allegations
generally so as to provide notice to the defendants and alert
the court as to what conduct violated clearly established law.”
Preschooler 

. Ashcroft argues that al-
Kidd’s allegations as to Ashcroft’s personal involvement in
the § 3144 Claim amount simply to “sheer speculation,” and
are insufficient to state a claim under Twombly.

   In Twombly, the Supreme Court held that an allegation of
parallel conduct by competitors, without more, does not suf-
fice to plead an antitrust violation under 15 U.S.C. § 

. While the Court expressly disclaimed any inten-
  23
    As discussed previously, “a plaintiff must plead that each
Government-official defendant, though the official’s own individual
actions” were involved in the constitutional deprivations. 

.
                      AL-KIDD v. ASHCROFT                   12313
tion to require general “heightened fact pleading of specifics,”

and reaffirmed the holding of Swierkiewicz v.
Sorema N.A., 

(2002) (rejecting a fact pleading
requirement for Title VII employment discrimination), it
stated that, to avoid dismissal under Federal Rule of Civil
Procedure 12(b)(6), a plaintiff must aver “enough facts to
state a claim to relief that is plausible on its face,” 

   Since the argument and initial briefing in this case, the
Supreme Court, in Ashcroft v. Iqbal, 

(2009),
has clarified Twombly’s reach to cases such as these. Iqbal
concerned claims against a number of defendants, including
FBI Director Mueller and Attorney General Ashcroft, made
by Javaid Iqbal, a Muslim Pakistani who was part of the mass
roundup of Muslim aliens on immigration charges following
the September 11 attacks. Iqbal claimed that Mueller and
Ashcroft were responsible for selectively placing detainees in
their restrictive conditions on account of their race and reli-
gion. 

The Supreme Court found the allegations in
the complaint insufficient to state a discrimination claim
under the above-discussed Twombly “plausibility” standard.

The Court held that a pleading “that offers ‘labels
and conclusions’ or ‘a formulaic recitation of the elements of
a cause of action’ ” is insufficient to state a claim under Rule
8 of the Federal Rules of Civil Procedure. 

(quoting

).

   In reviewing the complaint in Iqbal, the Court noted that
the complaint did not contain any factual allegations claiming
that Mueller or Ashcroft may have intentionally discriminated
on the basis of race or religion. 

(“Accepting the
truth of [the allegation of a adopting an impermissible policy],
the complaint does not show, or even intimate, that petitioners
purposefully housed detainees . . . due to their race, religion,
or national origin.”). The Court concluded that bare assertions
regarding an invidious policy were not entitled to the assump-
tion of truth because they amounted to “nothing more than a
‘formulaic recitation of the elements’ of a constitutional dis-
12314                AL-KIDD v. ASHCROFT
crimination claim.” 

(quoting 

). The Court noted that the alleged facts, even if
accepted as true, were more compatible on their face with
lawful conduct. 

unlike Iqbal’s allegations, al-Kidd’s complaint
“plausibly suggest[s]” unlawful conduct, and does more than
contain bare allegations of an impermissible policy. 

While the complaint similarly alleges that Ashcroft is
the “principal architect” of the policy, the complaint in this
case contains specific statements that Ashcroft himself made
regarding the post-September 11th use of the material witness
statute. Ashcroft stated that enhanced tactics, such as the use
of the material witness statute, “form one part of the depart-
ment’s concentrated strategy to prevent terrorist attacks by
taking suspected terrorists off the street,” and that
“[a]ggressive detention of lawbreakers and material witnesses
is vital to preventing, disrupting or delaying new attacks.”
Other top DOJ officials candidly admitted that the material
witness statute was viewed as an important “investigative
tool” where they could obtain “evidence” about the witness.
The complaint also contains reference to congressional testi-
mony from FBI Director Mueller, stating that al-Kidd’s arrest
was one of the government’s anti-terrorism successes—
without any caveat that al-Kidd was arrested only as a wit-
ness. Comparatively, Iqbal’s complaint contained no factual
allegations detailing statements made by Muller and Ashcroft
regarding discrimination. The specific allegations in al-Kidd’s
complaint plausibly suggest something more than just bare
allegations of improper purpose; they demonstrate that the
Attorney General purposefully used the material witness stat-
ute to detain suspects whom he wished to investigate and
detain preventatively, and that al-Kidd was subjected to this
policy.

   Further, unlike in Twombly and Iqbal, where the plaintiffs
alleged a conspiracy or discriminatory practice in the most
conclusory terms, al-Kidd does not rely solely on his assertion
                          AL-KIDD v. ASHCROFT                        12315
that Ashcroft ordered, encouraged, or permitted “policies and
practices [whereby] individuals have also been impermissibly
arrested and detained as material witnesses even though there
was no reason to believe it would have been practicable to
secure their testimony voluntarily or by subpoena.”24 His
complaint notes “one account” of material witness practices
stating that “nearly fifty percent of those detained in connec-
tion with post-9/11 terrorism investigations were not called to
testify.” In a declaration filed in another proceeding well
before al-Kidd’s arrest, a DOJ official admitted that, of those
detained as material witnesses, “it may turn out that these
individuals have no information useful to the investigation.”
Ctr. for Nat’l Sec. Studies v. U.S. Dep’t of Justice, 

, 942 (D.C. Cir. 2003) (Tatel, J., dissenting) (quoting Dec-
laration of James Reynolds, Chief of the Terrorism and Vio-
lent Crime Section, Criminal Division, Dep’t of Justice).

   Al-Kidd need not show that Ashcroft “actually instruct[ed]
his subordinates to bypass the plain text of the statute,” as
Ashcroft contends. The complaint clearly alleges facts which
might support liability on the basis of Ashcroft’s knowing
failure to act in the light of even unauthorized abuses, but also
alleges facts which may support liability on the basis that
Ashcroft purposely used the material witness statute to pre-
ventatively detain suspects and that al-Kidd was subjected to
this policy.25 As discussed above, Ashcroft publically stated
  24
      Ashcroft contends that al-Kidd does not even go so far as to make
such an assertion, and that he never explicitly says in his complaint that
Ashcroft designed such a policy. This argument requires a hypertechnical
reading of the complaint. The paragraph alleging outright violations of
§ 3144 begins with “the post-9/11 policies and practices,” with the definite
article. (Emphasis added). There is no reason from the text of the com-
plaint to think that those “post-9/11 policies and practices” are anything
other than “The post-9/11 material witness policies and practices adopted
and implemented by Defendant Ashcroft” alleged fourteen paragraphs ear-
lier in the complaint. (Emphasis added).
   25
      The dissent contends that the “knowing failure to act” standard did not
survive Iqbal. Dissent at 12345 n.13. The dissent points to the fact that the
12316                     AL-KIDD v. ASHCROFT
that the material witness statute was an important tool in “tak-
ing suspected terrorists off the street,” and that “[a]ggressive
detention of . . . material witnesses is vital to preventing, dis-
rupting or delaying new attacks.” Again, unlike in Iqbal, these
are not bare allegations that the Attorney General “knew of”
the policy. Here, the complaint contains allegations that plau-
sibly suggest that Ashcroft purposely instructed his subordi-
nates to bypass the plain reading of the statute.26 “The
plausibility standard is not akin to a ‘probability requirement’
but it asks for more than a sheer possibility that a defendant
has acted unlawfully.” 

(citing

). Here, the allegations recounted
above clearly “nudge[ ]” al-Kidd’s claim of illegality “across
the line from conceivable to plausible.” 

(citing

).

  Further, the complaint notes that the “abuses occurring
under the material witness statute after September 11, 2001,
were highly publicized in the media, congressional testimony
and correspondence, and in various reports by governmental
and non-governmental entities,” which could have given Ash-
croft sufficient notice to require affirmative acts to supervise
and correct the actions of his subordinates. The complaint also

Court held that Ashcroft could not be held liable for his “knowledge and
acquiescence” of his subordinates’ unconstitutional discrimination against
Muslim 

. We need not address whether the two
standards are distinct, or whether the Court’s comments relate solely to
discrimination claims which have an intent element, because al-Kidd plau-
sibly pleads “purpose” rather than just “knowledge” to impose liability on
Ashcroft. 

(“[P]urpose rather than knowledge is required to
impose Bivens liability . . . for an official charged with violations arising
from his or her superintendent responsibilities.”).
   26
      The dissent believes that al-Kidd’s complaint plausibly demonstrates
only that Ashcroft directed his subordinates to use the statute “pretextual-
ly,” not “unlawfully.” Dissent at 12348. As discussed above, the pretextual
use of the material witness statute that results in a person being detained
for criminal investigation without adequate probable cause runs afoul of
the Fourth Amendment, and is thus unlawful.
                         AL-KIDD v. ASHCROFT                         12317
avers that “the Justice Department has issued apologies to 10-
12 individuals who were improperly arrested as material wit-
nesses.” Given that the government maintains that it does
nothing wrong in the pretextual use of the material witness
statute to investigate and preemptively detain, it is reasonable
to infer that its apologies were for violations of the terms of
the statute itself, of which the DOJ, and presumably its leader,
were aware.27 The complaint also contains extensive citations
to the OIG Report, which discussed at length abuses and
improprieties that occurred in a related context, involving
investigatory detention of aliens. While the OIG Report was
not released to the public until April 2003, it is reasonable to
believe that Ashcroft, as Attorney General, would have been
aware of its contents at a date preceding al-Kidd’s arrest.

   Our dissenting colleague contends that al-Kidd’s pleadings
merely establish that “some material witnesses were detained
who did not testify or did not prove to have material informa-
tion,” perhaps because defendants took plea deals or prosecu-
tors acted hastily in conducting investigations. Dissent at
12347. The dissent further contends that this does not amount
to a Franks violation. 

. As discussed
above, al-Kidd pleads facts that go much farther than merely
showing that he was detained under the material witness stat-
ute and did not testify. The pleadings show that Ashcroft
explicitly stated that enhanced techniques such as the use of
the material witness statute “form one part of the depart-
ment’s concentrated strategy to prevent terrorist attacks by
taking suspected terrorists off the street.” Other top DOJ offi-
cials stated that the material witness statute was viewed as an
important “investigative tool,” and that al-Kidd’s arrest was
touted as one of the government’s anti-terrorism successes,
without any mention that he was being held as a material wit-
  27
    To be sure, this is not a necessary inference: the apologies could have
been for wrongs that do not rise to the level of a constitutional violation.
But neither is it an unreasonable inference, and on a Rule 12(b)(6) motion,
we draw all reasonable inferences in favor of the plaintiff.
12318                AL-KIDD v. ASHCROFT
ness. We disagree with the dissent, and hold that al-Kidd has
plead that Ashcroft’s “concerted strategy” of misusing the
material witness statute plausibly led to al-Kidd’s detention.

   Post-Twombly, plaintiffs face a higher burden of pleading
facts, and courts face greater uncertainty in evaluating com-
plaints. As discussed in Iqbal, “Rule 8 marks a notable and
generous departure from the hyper-technical, code-pleading
regime of a prior era, but it does not unlock the doors of dis-
covery for a plaintiff armed with nothing more than conclu-
sions.” 

This concern applied with great force in
the civil rights context, where “[t]he basic thrust of the
qualified-immunity doctrine is to free officials from the con-
cerns of litigation, including ‘avoidance of disruptive discov-
ery.’ ” 

(citing Siegert v. Gilley, 

, 236
(1991)). Drawing on our “judicial experience and common
sense,” as the Supreme Court urges us to do, we find that al-
Kidd has met his burden of pleading a claim for relief that is
plausible, and that his suit on the § 3144 claim should be
allowed to proceed. 

   [16] Were this case before us on summary judgment, and
were the facts pled in the complaint the only ones in the
record, our decision might well be different. In the district
court, moving forward, al-Kidd will bear a significant burden
to show that the Attorney General himself was personally
involved in a policy or practice of alleged violations of
§ 3144. But Twombly and Iqbal do not require that the com-
plaint include all facts necessary to carry the plaintiff’s bur-
den. “Asking for plausible grounds to infer” the existence of
a claim for relief “does not impose a probability requirement
at the pleading stage; it simply calls for enough fact to raise
a reasonable expectation that discovery will reveal evidence”
to prove that claim. 

. In this case,
we hold that al-Kidd has pled “enough facts to state a claim
to relief that is plausible on its face.” 

                      AL-KIDD v. ASHCROFT                  12319
  5.   Conditions of Confinement Claim

   Lastly, al-Kidd complains that he was mistreated while
confined as a material witness. Confinement of criminals is a
punishment, and, within the limits of the Fifth and Eighth
Amendments, it is supposed to be unpleasant. However,
when, as here, the government is empowered to detain those
who are not charged with crimes, it is under an obligation not
to treat them like criminals. See Youngsberg v. Romeo, 

, 321-22 (1982) (“Persons who have been involuntar-
ily committed are entitled to more considerate treatment and
conditions of confinement than criminals whose conditions of
confinement are designed to punish.”). Prior to 2003, at least
two district courts had refused, on constitutional grounds, to
house material witness detainees under the same conditions as
those facing trial. See United States v. Nai, 

,
46 (D. Mass. 1996) (expressing “concern[ ] that these five
material witnesses are being treated as if they were charged
with an offense” and ordering them “transferred to a mini-
mum security, residential facility”); In re Cochrane, 434 F.
Supp. 1207, 1215 (D. Neb. 1977) (holding that “a witness
who has had, at most, the misfortune of seeing a crime com-
mitted” must be held in “the least restrictive alternative that
is reasonably calculated to assure the witness’ presence for
trial”).

   On this appeal, Ashcroft contests neither the substance of
the right al-Kidd claims was violated in the Conditions of
Confinement Claim, nor whether that right was “clearly estab-
lished.” Rather, as with the § 3144 Claim, he argues only that
al-Kidd has failed to plead sufficient facts to tie Ashcroft, per-
sonally, to the alleged violation.

   [17] The unconstitutional conditions claim in this case is
substantially similar to the claims in the Supreme Court’s
recent Iqbal decision. In Iqbal, the complaint alleged Ash-
croft’s liability for the conditions of confinement at the Met-
ropolitan Detention Center in New York, where aliens
12320                AL-KIDD v. ASHCROFT
arrested after 9/11 were 

. Iqbal’s com-
plaint alleged that Ashcroft and FBI Director Robert Mueller
approved of these highly restrictive detention policies in dis-
cussions that took place in the weeks after September 11,
2001. 

Similarly, al-Kidd claims here that Ashcroft
promulgated and approved the unlawful policy which caused
al-Kidd “to be subjected to prolonged, excessive, punitive,
harsh, unreasonable detention or post-release conditions.”
Contrary to the § 3144 claim, however, the complaint does
not allege any specific facts—such as statements from Ash-
croft or from high ranking officials in the DOJ—establishing
that Ashcroft had personal involvement in setting the condi-
tions of confinement.

   As al-Kidd’s complaint notes, media reports had observed
the conditions detailed in the OIG Report to apply to Ameri-
cans and legal aliens held as material witnesses. See, e.g.,
Naftali Bendavid, Material Witness Arrests Under Fire; Doz-
ens Detained in War on Terror, Chi. Trib., Dec. 24, 2001, at
N1; Fainaru & 

, at A1; John Riley, Held With-
out Charge: Material Witness Law Puts Detainees in Legal
Limbo, N.Y. Newsday, Sept. 18, 2002, at A6. Their condi-
tions of confinement had also been noted by the courts. The
district court in Awadallah I, writing in the spring of 2002,
decried at length the state in which Mr. Awadallah had been
held:

    Awadallah was treated as a high security federal
    prisoner. Having committed no crime—indeed, with-
    out any claim that there was probable cause to
    believe he had violated any law—Awadallah bore
    the full weight of a prison system designed to punish
    convicted criminals as well as incapacitate individu-
    als arrested or indicted for criminal conduct.

       . . . In many ways, . . . the conditions of his con-
    finement were more restrictive than that experienced
    by the general prison population.
                      AL-KIDD v. ASHCROFT                  

; see 

& nn.5-10 (describing
Awadallah’s allegations of mistreatment while in custody).
While it is possible that these reports were sufficient to put
Ashcroft on notice by spring of 2003 that there was a sys-
temic problem at the DOJ with respect to its treatment of
material witnesses, the non-specific allegations in the com-
plaint regarding Ashcroft’s involvement fail to nudge the pos-
sible to the plausible, as required by Twombly.

   [18] Unlike the § 3144 Claim, which specifically avers
facts which could sustain the inference that Ashcroft “set[ ] in
motion a series of acts by others which the actor knows or
reasonably should know would cause others to inflict the con-
stitutional injury” regarding the illegal use of the material wit-
ness statute, Kwai Fun 

(internal
quotation marks omitted), the complaint’s more conclusory
allegations regarding Ashcroft’s involvement in setting the
harsh conditions of confinement (which are very similar to the
allegations in Iqbal), are deficient under Rule 8. Accordingly,
we reverse the district court on al-Kidd’s Conditions of Con-
finement claim, and hold that al-Kidd has not alleged ade-
quate facts to render plausible Ashcroft’s personal
involvement in setting the harsh conditions of his confine-
ment, and has therefore failed to state a claim for which relief
can be granted.

C.   Personal Jurisdiction

   Finally, Ashcroft contends that the district court erred in
denying Ashcroft’s Rule 12(b)(2) motion to dismiss for lack
of personal jurisdiction. As this is an interlocutory appeal, we
will address the issue only to the extent it falls within our pen-
dent appellate jurisdiction.

     1.   “Necessary to Provide Meaningful Review”

   Ashcroft first alleges that the issue of personal jurisdiction
is “necessary to provide meaningful review” of the district
12322                AL-KIDD v. ASHCROFT
court’s immunity rulings. It is true that personal jurisdiction
was a necessary predicate to the district court’s Rule 12(b)(6)
ruling denying Ashcroft absolute and qualified immunity. But
that could be said about any ruling following a decision on
personal jurisdiction, so that alone cannot make our review of
personal jurisdiction “necessary to provide meaningful
review.” See, e.g., Poulos v. Caesars World, Inc., 

, 671-72 (9th Cir. 2004) (holding that personal jurisdiction
not “necessary to ensure meaningful review” of class certifi-
cation); see also Rux v. Republic of Sudan, 

,
475-76 (4th Cir. 2006) (same with respect to review of subject
matter jurisdiction under FISA); E.I. DuPont de Nemours &
Co. v. Rhone Poulenc Fiber & Resin Intermediaries, S.A.S.,

, 204-05 (3d Cir. 2001) (same with respect to
review of motion to compel arbitration).

   The only cases that Ashcroft cites to suggest that personal
jurisdiction is necessary to ensure meaningful review are
cases involving interlocutory appeals of temporary injunc-
tions. 

; In re Diet Drugs, 

, 230 n.5 (3d Cir. 2002). In entering a preliminary
injunction, however, a district court has already necessarily
found “at least a reasonable probability of ultimate success
upon the question of jurisdiction.” Visual Scis., Inc. v. Inte-
grated Comm., Inc., 

, 59 (2d Cir. 1981) (citation
and quotation marks omitted). To rule on the preliminary
injunction is necessarily to make a judgment as to the ques-
tion of jurisdiction. More importantly, the equitable remedy of
injunction, granted before trial, is itself an imposition on the
defendant that goes well beyond merely being haled into
court, and often effectively decides the issue in question. See

n.9 (distinguishing a precedent
involving a permanent injunction because “[i]t is well-settled
that when a court grants an injunction, the underlying per-
sonal jurisdiction decision is immediately reviewable on
appeal”).
                     AL-KIDD v. ASHCROFT                  12323
  2.   “Inextricably Intertwined”

   Ashcroft next argues that the issue of personal jurisdiction
is “inextricably intertwined” with the immunity issues. To be
“inextricably intertwined,” we “require that the two issues: (a)
be so intertwined that we must decide the pendent issue in
order to review the claims properly raised on interlocutory
appeal or (b) resolution of the issue properly raised on inter-
locutory appeal necessarily resolves the pendent issue.” Batzel
v. Smith, 

, 1023 (9th Cir. 2003) (internal quota-
tion marks and alterations omitted). The first criterion fails:
unlike, for example, the temporary injunction, where success
on the merits, including on the issue of personal jurisdiction,
is an element of the issue being appealed, personal jurisdic-
tion is not a subset of qualified immunity and we need not
necessarily address the former to resolve the latter. Cf. 

decide the anti-SLAPP issue entirely independently
of the question of personal jurisdiction, and different legal
standards apply to each issue.”).

   [19] The second criterion, however, is present—in part. To
obtain specific personal jurisdiction over a defendant in a
state, the defendant must either purposefully avail himself of
the privilege of conducting activities in the state, or purpose-
fully direct his activities toward the state. Schwarzenegger v.
Fred Martin Motor Co., 

, 802 (9th Cir. 2004).
Purposeful direction, in turn, requires that the defendant have
(1) committed an “intentional act,” (2) “expressly aimed” at
the forum state, (3) causing harm that the defendant knows is
likely to be suffered in the forum state. 

The first
element, an intentional act, is effectively decided by resolu-
tion of the “personal involvement” prong of the qualified
immunity inquiry. Insofar as Ashcroft’s objection to personal
jurisdiction rests on the absence of an intentional act, we
affirm the decision of the district court to exercise personal
jurisdiction.

   [20] Insofar as Ashcroft’s objection to personal jurisdiction
rests on the fact that his acts were not “expressly aimed” at
12324                AL-KIDD v. ASHCROFT
Idaho, or that he did not know that his acts were likely to
cause harm in Idaho, we decline to rule on the issue. Far from
being “inextricably intertwined,” those issues are irrelevant to
any element of absolute or qualified immunity. The federal
courts of appeals are courts of limited jurisdiction, and Con-
gress has not seen fit to give this court the general power to
review district courts’ exercise of personal jurisdiction before
a final judgment. We therefore will not do so here.

                       CONCLUSION

  Almost two and a half centuries ago, William Blackstone,
considered by many to be the preeminent pre-Revolutionary
War authority on the common law, wrote:

    To bereave a man of life, or by violence to confis-
    cate his estate, without accusation or trial, would be
    so gross and notorious an act of despotism, as must
    at once convey the alarm of tyranny throughout the
    whole kingdom. But confinement of the person, by
    secretly hurrying him to gaol, where his sufferings
    are unknown or forgotten; is a less public, a less
    striking, and therefore a more dangerous engine of
    arbitrary government.

1 WILLIAM BLACKSTONE, COMMENTARIES ON THE LAWS oF
ENGLAND 131-32 (1765). The Fourth Amendment was written
and ratified, in part, to deny the government of our then-new
nation such an engine of potential tyranny. And yet, if the
facts alleged in al-Kidd’s complaint are actually true, the gov-
ernment has recently exercised such a “dangerous engine of
arbitrary government” against a significant number of its citi-
zens, and given good reason for disfavored minorities (who-
ever they may be from time to time) to fear the application of
such arbitrary power to them.

 We are confident that, in light of the experience of the
American colonists with the abuses of the British Crown, the
                     AL-KIDD v. ASHCROFT                 12325
Framers of our Constitution would have disapproved of the
arrest, detention, and harsh confinement of a United States
citizen as a “material witness” under the circumstances, and
for the immediate purpose alleged, in al-Kidd’s complaint.
Sadly, however, even now, more than 217 years after the rati-
fication of the Fourth Amendment to the Constitution, some
confidently assert that the government has the power to arrest
and detain or restrict American citizens for months on end, in
sometimes primitive conditions, not because there is evidence
that they have committed a crime, but merely because the
government wishes to investigate them for possible wrongdo-
ing, or to prevent them from having contact with others in the
outside world. We find this to be repugnant to the Constitu-
tion, and a painful reminder of some of the most ignominious
chapters of our national history.

  For the reasons indicated in this opinion, we AFFIRM in
part and REVERSE in part the decision of the district court.
Each party shall bear its own costs on appeal.



BEA, Circuit Judge, concurring in part and dissenting in part:



   This case raises the question whether a person whom a
prosecutor can rightly arrest under a statute becomes wrongly
arrested if the prosecutor’s purpose in arresting him had noth-
ing to do with the statute. Put another way, can a prosecutor,
empowered by law to arrest an individual for one declared
purpose, be immune from suit when he arrests that person
with another, secret purpose in mind?

   Our natural reaction is, “Of course not!” Such a prosecutor
is abusing the vast discretionary powers we have entrusted to
him. He is not playing fair; he is playing “Gotcha!”
12326                 AL-KIDD v. ASHCROFT
   But under our law, that natural reaction would be wrong.
For reasons of public policy, our law provides the prosecutor
with official immunity—perhaps not immunity from being
fired, impeached, or hounded from public life, but immunity
nonetheless—from lawsuits for money damages based on the
acts he undertakes on behalf of the public.

   The Supreme Court has developed this law by repeatedly
instructing us not to inquire into the personal, subjective
intentions of a government official when determining whether
the official is protected by official immunity. Reading the
minds of government officials is notoriously expensive,
uncertain, and fraught with error. The very purpose of official
immunity is to shield the purses of government officials from
the high costs of civil damages lawsuits. If official immunity
were to depend upon proof of the officials’ good intentions,
the value of that immunity would be lost.

   Yet today, the majority permits plaintiff Abdullah al-Kidd
to seek redress from the wallet of a federal cabinet-level offi-
cial for injuries al-Kidd alleges he suffered when he was
detained—pursuant to a warrant signed and issued by a neu-
tral federal magistrate judge—as a material witness in the
government’s prosecution of an indicted terrorist suspect.

   The sole reason the majority provides for stripping former
Attorney General John Ashcroft of his official immunity is
that, although he and his subordinates had sufficient evidence
to arrest al-Kidd as a material witness in the prosecution of a
suspected terrorist under the applicable statute, they acted
with a forbidden state of mind: they really arrested him not
to testify against the indicted terror suspect, but to investigate
al-Kidd himself.

  Because I do not believe this holding comports with the
Supreme Court’s instructions regarding official immunity and
Fourth Amendment law, I must respectfully dissent.
                         AL-KIDD v. ASHCROFT                         12327
   I also dissent from the majority’s resolution of al-Kidd’s
claim that Ashcroft is personally liable for the inclusion of
claimed material misrepresentations and omissions in the affi-
davit supporting the material witness warrant on which al-
Kidd was detained. Al-Kidd’s complaint does not state facts
sufficient plausibly to show Ashcroft was personally responsi-
ble for the claimed falsities. See Ashcroft v. Iqbal, 

(2009).

                            I.   Background

   After 9/11, in connection with an investigation into terrorist
activities in Idaho, federal agents interviewed al-Kidd on sev-
eral occasions. In February 2003, a grand jury returned an
indictment against Sami Omar Al-Hussayen, a suspect in that
investigation. During the course of the investigation, FBI
agents learned, and later affied, that al-Kidd had received “in
excess” of $20,000 from Al-Hussayen, had met with Al-
Hussayen’s associates after al-Kidd’s trip to Yemen, and had
contacts with the Islamic Assembly of North America
(“IANA”) (the suspected Jihadist organization for which Al-
Hussayen worked).1 One month later, al-Kidd purchased a
plane ticket to Saudi Arabia. Apprehensive, they said, that al-
Kidd would abscond to Saudi Arabia with information critical
to the prosecution of al Hussayen, never to return, the federal
agents sought a warrant for his arrest. The agents appeared
before a magistrate, swore they had good cause to believe al-
Kidd both had information material to Al-Hussayen’s prose-
cution and was on the run, and then arrested al-Kidd at Dulles
International Airport as he was about to board a plane to
  1
    As the majority states, the Al-Hussayen indictment alleged that one of
the IANA’s purposes was “indoctrination, recruitment of members, and
the instigation of acts of violence and terrorism.” The Al-Hussayen indict-
ment also alleged Al-Hussayen himself was the sole registrant of another
website, www.alasr.ws, which was affiliated with the IANA’s website
through a third website belonging to the IANA. The www.alasr.ws web-
site published an article in June 2001 entitled “Provision of Suicide Opera-
tions,” which advocated suicide bombings and “bringing down” aircraft.
12328                AL-KIDD v. ASHCROFT
Saudi Arabia. The government held al-Kidd for fourteen days
and released him only when al-Kidd surrendered his passport
and agreed to certain conditions of release. In the event, al-
Kidd was never called to testify at al-Hussayen’s trial.

   Al-Kidd filed this action under Bivens v. Six Unknown
Named Agents, 

(1971), in the United States Dis-
trict Court for the District of Idaho. Al-Kidd named as defen-
dants not only the officers who prepared the material witness
warrant, but former Attorney General Ashcroft, FBI Director
Robert Mueller, and former Secretary of the Department of
Homeland Security Michael Chertoff, as well as the wardens
of the prisons in which he was detained. In his complaint, al-
Kidd raises three very distinct claims. First, al-Kidd alleges
that the conditions under which he was confined were uncon-
stitutionally harsh. Second, al-Kidd alleges his detention on a
material witness warrant was illegal because it was based on
pure pretext; the government wanted to detain al-Kidd not to
secure his testimony at the Al-Hussayen trial but really to
keep al-Kidd himself off the streets and to investigate him.
Al-Kidd contends that even if the warrant on which he was
detained was objectively valid, the preparing officers’ subjec-
tive intention to use the warrant to accomplish an illicit goal
rendered the officers’ actions unconstitutional. Third, al-Kidd
contends the warrant was not only illegal because it was pre-
textual, it was also invalid because it was based on an affida-
vit containing material misrepresentations and omissions: Al-
Kidd had no information useful to the investigation, he was
not a flight risk, and the government knew it but concealed
those facts from the magistrate.

  Ashcroft contends each of these claims is barred, either
because al-Kidd has not pleaded facts sufficient to establish
Ashcroft’s personal involvement; because Ashcroft enjoys
absolute or qualified immunity against al-Kidd’s claims; or,
because the district court lacked personal jurisdiction over
Ashcroft.
                      AL-KIDD v. ASHCROFT                  12329
   The majority concludes that al-Kidd has not adequately
pleaded Ashcroft’s personal involvement in the decision to
subject him to unconstitutionally harsh conditions of confine-
ment. I agree, and therefore I join in Part B.5 of the majority
opinion (“The Conditions of Confinement Claim”).

  As to al-Kidd’s second and third claims, however, the
majority affirms the district court’s order denying Ashcroft’s
motion to dismiss.

   I disagree. As to al-Kidd’s claim prosecutors used the mate-
rial witness statute as a pretext to pursue other, investigatory
or crime prevention agendas, the answer is simply that such
pretext does not invalidate the arrest warrant; I would hold
Ashcroft is shielded by qualified immunity. In light of the
considerable authority recognizing that the pretextual use of
an objectively justifiable search or seizure does not violate the
Fourth Amendment, it follows the federal agents did not vio-
late al-Kidd’s constitutional rights. But if I’m wrong, in any
case al-Kidd’s right not to be arrested on an objectively valid,
but pretextual arrest warrant was not “clearly established” in
March 2003, when al-Kidd was detained, and qualified immu-
nity therefore shields Ashcroft from al-Kidd’s claims. See
Saucier v. Katz, 

(2001). I therefore dissent from
part B.3 of the majority opinion (“The Fourth Amendment
Claim”).

   As to al-Kidd’s claim that his detention violated the Fourth
Amendment and the terms of the material witness statute
because the supporting warrant application contained material
misrepresentations and omissions, we cannot reach the merits
of his claim, for—as with his claim that Ashcroft is liable for
the claimed wretched conditions of al-Kidd’s confinement, as
to which all of us agree his claim fails—al-Kidd has failed to
allege facts sufficient to establish Ashcroft’s personal liability
for such conduct. See Ashcroft v. Iqbal, 556 U.S. __, 

(2009). Therefore I dissent from part B.4 of the
majority opinion.
12330                       AL-KIDD v. ASHCROFT
   Lastly, I disagree, in part, with the majority’s treatment of
Ashcroft’s claim of absolute immunity. I agree that Ashcroft
lacks absolute prosecutorial immunity for his acts or omis-
sions in supervising the officers who acted as complaining
witnesses in support of a material witness warrant application.
When officials—whether prosecutors or police officers—act
as mere witnesses in support of a warrant application, abso-
lute immunity does not shield their actions. Equally, Ashcroft
would lack absolute immunity for his acts or omissions in
supervising officers who obtain a material witness warrant to
secure the presence of a witness before an investigatory grand
jury, rather than a criminal trial. However, I disagree that
Ashcroft does not enjoy absolute immunity for his supervision
of prosecutors who decide to seek a material witness warrant
to secure the presence of a witness at a criminal trial, regard-
less of any claimed improper motive.2

   I address each of these issues in turn.

                      II.     Qualified Immunity

   I would hold that Ashcroft enjoys qualified immunity from
al-Kidd’s claim that the material witness warrant on which he
was detained was merely a pretext to accomplish other law
enforcement objectives. To be clear, al-Kidd’s pretext claim
is not that the material witness warrant on which he was
detained was invalid on its face or because it was based on an
affidavit containing material misrepresentations or omissions.3
  2
     I express no opinion as to parts B.1 (“Qualified Immunity Generally”)
and B.2 (“Qualified Immunity for Supervisors”). I also express no opinion
as to part C (“Personal Jurisdiction”). Because I conclude al-Kidd cannot
proceed on his claims against Ashcroft, I would not reach the difficult
question whether this court has pendent appellate jurisdiction over Ash-
croft’s appeal of the district court’s order denying his motion to dismiss
al-Kidd’s claims against him for lack of personal jurisdiction. If it is not
necessary to decide an issue, it is necessary for a common-law court not
to decide it.
   3
     Al-Kidd later makes this claim separate and distinct from his pretext
claim. It is addressed infra, parts III and IV.
                         AL-KIDD v. ASHCROFT                        12331
Rather, in his pretext claim, al-Kidd contends that even if the
material witness warrant on which he was detained was objec-
tively valid and supported by probable cause, the prosecutor’s
subjective intention to use the material witness warrant to
accomplish other, law-enforcement objectives renders the
government’s conduct unconstitutional. Because al-Kidd had
no constitutional right to be free from such conduct—and cer-
tainly had no clearly established constitutional right—I dis-
sent from the majority’s conclusion that Ashcroft lacks
qualified immunity.

   Al-Kidd bases his claims of liberty from arrest on the
Fourth Amendment. The Supreme Court has repeatedly stated
that under the Fourth Amendment, an officer’s subjective
intentions are irrelevant so long as the officer’s conduct is
objectively justified. See, e.g., Maryland v. Macon, 

, 470-71 (1985) (“Whether a Fourth Amendment violation
has occurred turns on an objective assessment of the officer’s
actions in light of the facts and circumstances confronting him
at the time, and not on the officer’s actual state of mind at the
time the challenged action was taken.” (internal citations and
quotation marks omitted));4 Scott v. United States, 

, 136-37 (1978) (“Subjective intent alone, the Government
contends, does not make otherwise lawful conduct illegal or
unconstitutional. We think the Government’s position, which
also served as the basis for decision in the Court of Appeals,
   4
     In Macon, an undercover police officer purchased pornographic mate-
rials from a bookstore. The officer left the bookstore, consulted with fel-
low officers, and, upon concluding the book was pornographic, returned
to the bookstore and arrested the storekeeper and seized the marked bill
the officer used to purchase the book. The Supreme Court held that the
purchase, in a voluntary transaction, of wares by an undercover officer is
not a search within the meaning of the Fourth Amendment. 

The
storekeeper contended the officer’s subjective intention to retrieve the
marked $50 bill transformed the sale into a search. 

The
Supreme Court disagreed and held that because the transaction, objec-
tively viewed, was a sale in the ordinary course of business, the sale did
not constitute a search. 

v. ASHCROFT
embodies the proper approach for evaluating compliance with
the minimization requirement [relating to wiretaps].”);5
United States v. Robinson, 

, 236 (1973) (holding
that an officer’s objectively lawful search incident to arrest
was lawful though officer lacked the subjective intention—
fear that the arrestee was armed—that normally attaches to
such searches).

   Whren v. United States, 

(1996), cited by the
majority, is but one example of the general rule that pretextual
searches and seizures do not violate the Fourth Amendment.
In Whren, the Supreme Court held the stop of a vehicle for a
minor traffic violation did not violate the Fourth Amendment
even though the officer was using the stop “as pretext[ ] for
pursuing other investigatory agendas.” 

. The Court
stated:

     We [have] flatly dismissed the idea that an ulterior
     motive might serve to strip the agents of their legal
   5
     In Scott, officers obtained a warrant to intercept the phone calls of a
suspected drug dealer. 

The warrant required the officers to min-
imize their interception of non-narcotics-related phone calls. 

tap resulted in the arrest and indictment of more than twenty individuals.

to suppress the intercepted phone calls on the ground offi-
cers had failed to comply with the minimization requirement. 

The district court granted the motion to suppress, concluding that even if
every intercepted phone call had been narcotics-related, the officers’ fail-
ure to make any good faith efforts to comply with the minimization
requirement rendered the wiretap illegal. 

The court of
appeals reversed because the court could not conclude that reasonable
efforts at minimization would have prevented the interception of any of
the phone calls. 

After a jury trial on remand, Scott was con-
victed. The court of appeals affirmed, 

and the Supreme Court
affirmed the court of appeals. 

The Supreme Court rejected
Scott’s contention that the officers’ “failure to make good-faith efforts to
comply with the minimization requirement is itself a violation of [the
wiretap statute].” 

The Court explained that the “existence vel
non of such a violation turns on an objective assessment of the officer’s
actions in light of the facts and circumstances confronting him at the
time,” not on the officers’s subjective intentions. 

                          AL-KIDD v. ASHCROFT                        12333
     justification. . . . [S]ubjective intent alone . . . does
     not make otherwise lawful conduct illegal or uncon-
     stitutional. We described Robinson [414 U.S. at 236]
     as having established that “the fact that the officer
     does not have the state of mind which is hypothe-
     cated by the reasons which provide the legal justifi-
     cation for the officer’s action does not invalidate the
     action taken as long as the circumstances, viewed
     objectively, justify that action.”

(internal citations omitted). It is really quite sim-
ple. If you are engaged in conduct that justifies your deten-
tion, you must put up with that detention, even if the officer
who detained you did so out of some secret—and constitu-
tionally insufficient—motive.

   There is good reason to eschew inquiry into the subjective
motivations of individual officers. First, such an approach
provides “arbitrarily variable” protection to individual rights.
Devenpeck v. Alford, 

, 154 (2004). If the subjec-
tive intentions of the arresting officers are the touchstone of
constitutional analysis, courts may reach divergent results
about searches and seizures that are utterly indistinguishable
in the eyes of the person whose rights are at stake. See 

Second, the inquiry into subjective intentions is impos-
sibly difficult, expensive, and prone to error. As the Supreme
Court explained in Harlow v. Fitzgerald,
   6
     For example, imagine two drug smugglers speeding, illegally, down
the highway who are stopped by police. Each smuggler is identical in
every respect, save one: one is stopped by an officer totally ignorant of the
fact that the car is carrying drugs, the other by an officer who suspects the
driver’s involvement in a drug ring. Seen from the perspective of the two
drivers, each should face an identical penalty. Each broke the law and
made himself subject to being stopped. But if the suspicious officer’s sub-
jective intentions invalidate his stop, then one driver escapes punishment
while the other does not. As Devenpeck explained, an individual’s right to
be free of arrest should not depend upon such chance factors as which
police officer arrested him. 

12334                AL-KIDD v. ASHCROFT
    [t]here are special costs to subjective inquiries of this
    kind. . . . Judicial inquiry into subjective motivation
    therefore may entail broad-ranging discovery and the
    deposing of numerous persons, including an offi-
    cial’s professional colleagues. Inquiries of this kind
    can be peculiarly disruptive of effective government.

, 816-817 (1982) (footnotes and internal quota-
tion marks omitted). Whren, along with Harlow, Robinson,
Scott, and Macon, makes clear that al-Kidd’s arrest on an
objectively valid warrant supported by probable cause vio-
lated none of al-Kidd’s constitutional rights. At a minimum,
these cases would have given a reasonable officer good rea-
son to believe that al-Kidd’s arrest was constitutionally per-
missible.

   The majority’s efforts to distinguish Whren are unpersua-
sive. The majority contends that Whren and like cases are
inapplicable whenever the government acts without probable
cause to believe that the subject of the arrest is guilty of some
criminal wrongdoing. Maj. Op. at 12296-97. To reach this
result, the majority imports the “programmatic purpose” test
ordinarily reserved for administrative or “special needs”
search cases. The programmatic purpose test, of course, tests
the constitutional validity of warrantless searches and sei-
zures, such as drunk driving roadblocks, by requiring the gov-
ernment to prove its program serves governmental interests
other than the routine collection of evidence for criminal pros-
ecution. See, e.g., Ferguson v. City of Charleston, 

, 78 (2001); City of Indianapolis v. Edmond, 

,
45 (2000). The special needs cases are the sole exception to
the general principle that, in testing compliance with the
Fourth Amendment, courts are limited to an examination of
the objective circumstances which justify the search or sei-
zure, and may not inquire into official purpose. 

(“Not only have we never held, outside the con-
text of inventory search or administrative inspection[,] . . .
that an officer’s motive invalidates objectively justifiable
                     AL-KIDD v. ASHCROFT                  12335
behavior[,] . . . we have repeatedly held and asserted the con-
trary.”). The programmatic purpose test applies here, the
majority says, because in Edmonds, the Supreme Court said
that Whren did not apply whenever the government conducted
a search or seizure without “probable cause,” and because
“probable cause” means only probable cause to believe the
subject of the arrest committed some wrongdoing. The cases
the majority cites offer no support whatsoever for the majori-
ty’s approach.

   First, the special needs cases have no bearing on the inquiry
into al-Kidd’s arrest for the simple reason that al-Kidd was
arrested pursuant to a warrant issued by a neutral magistrate.
The “programmatic purpose” inquiry is necessary to test the
validity of a special needs search precisely because such
searches occur without the procedural protections of the war-
rant requirement and the magisterial supervision it entails. As
the Supreme Court explained in New York v. Burger, a statute
authorizing a warrantless administrative or special needs
search must provide

    a constitutionally adequate substitute for a warrant.
    In other words, the regulatory statute must perform
    the two basic functions of a warrant: it must advise
    the owner of the commercial premises that the search
    is being made pursuant to the law and has a properly
    defined scope, and it must limit the discretion of the
    inspecting officers.

, 710-11 (1987) (emphasis added) (quotations
omitted). Material witness warrants, though not based on indi-
vidualized suspicion of wrongdoing are, of course, warrants:
they are based on an individualized determination that the
subject of the warrant is in possession of information material
in a criminal proceeding and is likely to flee; they are
approved by a neutral magistrate; they are subject to continu-
ing oversight; and they issue only upon a showing of probable
cause. Bacon v. United States, 

, 942 (9th Cir.
12336                    AL-KIDD v. ASHCROFT
1971); 18 U.S.C. §§ 3144; Fed. R. Civ. P. 46. The “special
needs” cases bear little resemblance to the highly supervised
process of obtaining a material witness warrant. Given the
protections in § 3144, there is simply no need to inquire into
the government’s “programmatic purpose,” and no case has
ever so required.

   Second, the majority’s “traditional” definition of “probable
cause,” which limits probable cause to mean only probable
cause to believe that the arrestee is guilty of wrongdoing, Maj.
Op. at 12297-98, reflects a fundamental misunderstanding of
the Fourth Amendment. The validity of a police action under
the Fourth Amendment turns not on the guilt or innocence of
the arrestee, but on whether the government’s reasons for
arresting the individual are weighty enough, and probably fac-
tually likely enough, to justify the intrusion into some individ-
ual’s rights.7 See United States v. Knights, 

,
118-19 (2001) (“The touchstone of the Fourth Amendment is
reasonableness, and the reasonableness of a search is deter-
mined by assessing, on the one hand, the degree to which it
intrudes upon an individual’s privacy and, on the other, the
degree to which it is needed for the promotion of legitimate
governmental interests.”) (internal quotation marks omitted).
The “probable cause” requirement assures that there is suffi-
cient evidence to believe that the facts that justify the issuance
of the warrant exist—that there is a sufficient “probability”
the government will find what it is looking for when it
intrudes. 

  Until today, no case has suggested that the only govern-
mental interest of sufficient weight to justify an arrest is a rea-
  7
   This is not to deny the existence of what the majority terms the “sub-
stantive component” of the Fourth Amendment. Maj. Op. at 12298.
Instead, this merely demonstrates that this “substantive component” of the
Fourth Amendment can be satisfied by any governmental interest—
whether to detain a wrongdoer or to provide for the production of evidence
against a wrongdoer—weighty enough to justify an intrusion into individ-
ual rights.
                          AL-KIDD v. ASHCROFT                        12337
sonable belief that the arrestee has committed a crime. Most
importantly, the Supreme Court has stated that the govern-
ment’s interest in the integrity of the justice system is impor-
tant enough to justify the arrest of a wholly innocent person
to secure that witness’s appearance at trial. See Stein v. New
York, 

, 184 (1953) (“The duty to disclose knowl-
edge of crime rests upon all citizens. It is so vital that one
known to be innocent may be detained, in the absence of bail,
as a material witness.”), rev’d on other grounds by Jackson v.
Denno, 

(1964); Barry v. United States ex rel.
Cunningham, 

, 616-17 (1929) (“The constitu-
tionality of [the material witness statute] apparently has never
been doubted.”).8 Our own jurisprudence, too, has recognized
that “probable cause” for an arrest may exist even in the
absence of a reasonable belief that the arrestee has committed
wrongdoing. For example, police officers may arrest individu-
als innocent of any crime if the officer has reason to believe
that the individual is a danger to himself. Maag v. Wessler,

, 776 (9th Cir. 1992). To be sure, in the great run
of arrest cases, the relevant inquiry will be whether officers
had probable cause to believe the subject committed wrong-
doing. But none of the cases the majority claims defines prob-
able cause had occasion to consider whether such belief was
the only belief that could justify an arrest.
   8
     The majority needlessly casts doubt upon the validity of § 3144. Even
if the Supreme Court’s statements on the issue are dicta, they have consid-
erable weight here. In part because we cannot “lightly” disregard any
Supreme Court precedent, Siskiyou Regional Educ. Project v. U.S. Forest
Serv., 

, 549 n.1 (9th Cir. 2009), and in part because this court
has already positively commented on these statements, see 

. In any event, Al-Kidd does not contend that a showing of
probable cause to believe (1) that a witness has information that is material
in any criminal proceeding and (2) the witness’s appearance cannot be
secured by subpoena is insufficient to provide objective justification for an
arrest. See Appellee’s Brief at 43. Notably, in neither Barry nor Stein was
there any suggestion that the validity of a material witness warrant would
either turn on the subjective intentions of the officers or depend upon a
demonstration that there was probable cause to believe the subject of the
arrest was guilty of wrongdoing.
12338                     AL-KIDD v. ASHCROFT
   In the closely analogous context of searches, it is clear that,
consistent with the Fourth Amendment, government agents,
with a warrant supported by probable cause, may intrude to
search upon the premises even of individuals who are sus-
pected of no wrongdoing whatsoever. In Zurcher v. Stanford
Daily, 

(1978), government agents obtained a
warrant to search the offices of the Stanford Daily for photo-
graphs that might reveal the identity of protesters who had
assaulted policemen during a campus disturbance. 

There was no claim that Stanford Daily photographers or
employees were themselves the assailants. See 

Court held the warrant was valid, despite the fact
that members of the Stanford Daily were not suspected of
having done anything wrong: “[V]alid warrants may be issued
to search any property, whether or not occupied by a third
party, at which there is probable cause to believe that fruits,
instrumentalities, or evidence of a crime will be found.” 

(emphasis added); see also Steagald v. United States, 

(1981) (holding that an arrest warrant does not
authorize officers to enter the homes of third parties to exe-
cute the warrant, absent exigent circumstances, without first
obtaining a warrant to enter the premises).9

   Though Zurcher involved a search, rather than a seizure, its
rationale is applicable here and squarely rejects the majority’s
contention that the probable cause requirement of the Fourth
Amendment may be satisfied only by suspicion of wrongdo-
ing by the subject of the intrusion. As the Supreme Court
  9
    Steagald also demonstrates that the majority’s invocation of the Wilkes
cases is inapposite. The evil associated with the general writs and writs of
assistance used in the colonial period was that these warrants “provided
no judicial check on the determination of the executing officials that the
evidence available justified an intrusion into a particular home.” 

§ 3144 provides precisely the check on official discretion that was absent
during the colonial period: supervision by a neutral magistrate. It was not
Lord Halifax or even Attorney General Ashcroft who signed the material
witness warrant that authorized Al-Kidd’s arrest. It was a federal magis-
trate judge.
                         AL-KIDD v. ASHCROFT                         12339
explained, the property owner’s guilt or innocence is simply
irrelevant to the constitutional analysis: “it is apparent that
whether the third-party occupant is suspect or not, the State’s
interest in enforcing the criminal law and recovering the evi-
dence remains the same . . . .” 

. And
one who knows he has evidence relevant to a criminal prose-
cution but refuses to hand such evidence over to prosecutors
“is sufficiently culpable to justify the issuance of a search
warrant.” 

holds true for a material witness. The
government’s interest in recovery of evidence from a material
witness is the same whether the witness is guilty or innocent
of wrongdoing. The need to obtain evidence from that witness
and secure his appearance at trial is of sufficient weight to
justify an arrest. See 

; 

.

  In short, our cases, and those of the Supreme Court, have
routinely recognized that “probable cause,” within the mean-
ing of the Fourth Amendment, may be satisfied by proof of
something other than wrongdoing by the subject of the search
or seizure.

   Of course, taken to its logical conclusion, the majority
opinion renders the material witness statute entirely superflu-
ous. To arrest and confine an individual pursuant to the mate-
rial witness statute, the government must establish “probable
cause.” 

-43. If “probable cause” exists
only when the subject of an arrest is suspected of a crime,
then a material witness can be arrested as a suspect, and the
material witness statute adds nothing.10 This result is risible.11
   10
      The majority contends it does not render the material witness statute
superfluous by arguing that if the statute is “genuinely” used to secure the
testimony of a witness at trial, a showing of probable cause that the
arrestee has engaged in wrongdoing is not required, and that only when
the statute is being used as a pretext for criminal investigation is a show-
ing of probable cause “including individualized suspicion of criminal
wrongdoing” required. Maj. Op. at 12303. (emphasis in original). This
12340                    AL-KIDD v. ASHCROFT
Once the government demonstrated to a neutral magistrate
that it had probable cause to believe al-Kidd had information
material to a criminal proceeding and was likely to run off to
Saudi Arabia, the Whren rule applied with full force, and
nothing in Edmond or any case the majority cites suggests
otherwise.

   Third, the Supreme Court’s decision in United States v.
Villamonte-Marquez, 

(1983), which the major-
ity inadequately addresses, casts even greater doubt on the
correctness of the majority’s decision. In that case, the
Supreme Court authorized precisely what the majority says
can never be permissible: a pretextual seizure in the absence
of reasonable suspicion or probable cause. In that case, cus-
toms agents, acting on a tip about marijuana smuggling,
detained a sailboat pursuant to 19 U.S.C. § 1581(a). That stat-
ute authorized customs agents to “board any vessel at any

argument suggests that the probable cause standard for issuing a warrant
can vary depending on the subjective intention of the officer seeking the
warrant. Not only is there no support in the case law for such a position,
it is directly contradicted by the holding in 

. Fur-
thermore, the majority seems implicitly to recognize that probable cause
can encompass more than the likelihood that the arrestee has engaged in
criminal wrongdoing. Otherwise the majority’s argument reads the neces-
sity of showing probable cause right out of the issuance of a material wit-
ness warrant when the prosecutor “really” wants to obtain evidence for
trial, and thus runs directly against the express language of the Fourth
Amendment. If the prosecutor wants a material witness warrant because
he “really” wants to secure that person’s testimony at trial, according to
the majority, he need not show probable cause that the potential witness
engaged in wrongdoing. However, unless the majority also recognizes that
probable cause in this context means showing a likelihood that the arrestee
has material testimony, and that it will become impracticable to secure his
presence by subponea as required by 18 U.S.C. § 3144, then the majority
would be sanctioning the issuance of an arrest warrant without any proba-
ble cause whatsoever.
   11
      And we have been wasting much printer’s ink on material witness
statutes which have existed at least since the late Eighteenth Century. See

.
                     AL-KIDD v. ASHCROFT                   12341
time and at any place in the United States to examine the ves-
sel’s manifest and other documents.” 

While execut-
ing the document inspection, officers smelled marijuana.
They found 5800 pounds of the stuff on board the ship and
arrested the crew. 

The crew members were con-
victed for conspiracy to import marijuana. 

the
Fifth Circuit reversed the convictions, holding the detention
was invalid—the officers lacked constitutionally sufficient
individualized suspicion of wrongdoing—and the fruits of the
detention were barred from evidence. 

The
Supreme Court reversed the decision of the Fifth Circuit and
upheld the convictions. 

The Court held that the
special difficulties associated with enforcement of maritime
registration laws justified suspicionless stops and inspections
on waterways. 

The Court emphasized the long his-
torical pedigree of § 1581(a) as proof that the Founders did
not believe such intrusions violated the Fourth Amendment.

In a footnote, the Court rejected the crew mem-
bers’ contention that the customs officers’ subjective inten-
tions rendered the stop and inspection pretextual and thus
unlawful:

    Respondents, however, contend . . . that because the
    Customs officers were accompanied by a Louisiana
    State Policeman, and were following an informant’s
    tip that a vessel in the ship channel was thought to
    be carrying marijuana, they may not rely on the stat-
    ute authorizing boarding or inspection of the vessel’s
    documentation. This line of reasoning was rejected
    in a similar situation in Scott . . . and we again reject
    it.

n.3.

   Like the statute at issue in Villamonte-Marquez, some ver-
sion of the material witness statute has been on the books
since the late-1700s. See 

. Since
then, courts have approved the constitutionality of the power
12342                AL-KIDD v. ASHCROFT
to detain material witnesses. See supra note 11. As the
Supreme Court explained, the “ ‘duty to disclose knowledge
of crime . . . is so vital that one known to be innocent may be
detained, in the absence of bail, as a material witness.’ ”

(quoting 

).

   Finally, Villamonte-Marquez also underlines the point that,
even assuming we must consider the “programmatic purpose”
behind al-Kidd’s detention, the relevant inquiry is not into the
motivations of individual officers who obtained and executed
the particular warrant on which al-Kidd was detained, but into
the “programmatic purpose” that provides the constitutional
justification for the material witness statute. See 

(“[W]e caution that the purpose inquiry in this
context is to be conducted only at the programmatic level and
is not an invitation to probe the minds of individual officers
acting at the scene.”). The justification for the use of material
witness warrants is the need to assure the proper functioning
of the judicial system; this interest is divorced from the gov-
ernment’s general interest in crime control and is sufficient,
al-Kidd concedes, to justify an arrest. Because this govern-
mental interest justifies this intrusion into al-Kidd’s liberty,
and because the intrusion is subject to a warrant requirement,
inquiry into the minds of individual officers is neither neces-
sary nor desirable. See 

n.3.

   But even if al-Kidd’s arrest on a pretextual material witness
warrant violated his Fourth Amendment constitutional right
not to be subjected to an unreasonable seizure, any such right
was certainly not “clearly established” in March 2003. As the
majority notes, for a right to be clearly established there need
not be a case on point, but the violation must be “apparent”
to a reasonable official. Hope v. Pelzer, 

, 739
(2002). In March 2003, when al-Kidd was arrested on a mate-
rial witness warrant, it would hardly have been “apparent” to
a reasonable official that using a valid material witness war-
rant as a pretext to accomplish other law-enforcement objec-
                          AL-KIDD v. ASHCROFT                          12343
tives was constitutionally impermissible, especially if the
official had read Whren, Robinson, Scott, or Macon.

   No court had ever questioned the constitutional validity of
the material witness statute. No court had ever held that the
“programmatic purpose” test applied to searches or seizures
conducted pursuant to a warrant. No court had held that
“probable cause” in the Fourth Amendment meant
only probable cause to believe the subject of the search or sei-
zure had committed criminal wrongdoing. Every pronounce-
ment by the Supreme Court would have suggested that the
pretextual use of a valid warrant was perfectly legal.

   Eight months after al-Kidd’s arrest, for the very first time,
and in dicta no less, a court of appeals stated that the pretex-
tual use of material witness warrants was “improper.” United
States v. Awadallah, 

, 59 (2d Cir. 2003) (“The dis-
trict court noted (and we agree) that it would be improper for
the government to use § 3144 for other ends, such as the
detention of persons suspected of criminal activity for which
probable cause has not yet been established.”).12 Prior to that,
only one district court had said anything similar. See United
States v. Awadallah, 

, 78 (S.D.N.Y. 2002),
rev’d on other grounds by Awadallah, 

. In light
of the substantial contrary authority spelling out that an offi-
cer’s subjective intentions do not invalidate an objectively
valid warrant, this solitary district court decision was hardly
sufficient to make it “apparent” to a reasonable official that
  12
     Obviously, we are not bound by the decision of another circuit, espe-
cially if that part of the decision was dicta. In any event, unlike in our cir-
cuit, dicta in the Second Circuit is not binding authority even in the
Second Circuit. Jiminez v. Walker, 

, 142-43 (2d Cir. 2006).
It also remains to be said: what did Awadallah mean by the use of “im-
proper”? It could mean anything from pecksniffian distaste to sanctionable
conduct by an officer of the courts, and from harmless error to grounds for
reversal. It seems not even a thin reed upon which to base an assertion it
proclaimed to the nation’s constabulary a “clearly established” constitu-
tional right.
12344                 AL-KIDD v. ASHCROFT
the pretextual use of material witness warrants was unconsti-
tutional. See Sorrels v. McKee, 

, 970-71 (9th Cir.
2002) (holding that two district court decisions were insuffi-
cient to make a right “clearly established”).

   The Supreme Court has flatly stated that pretextual
searches and seizures conducted pursuant to a warrant issued
upon objectively reasonable probable cause do not violate the
Fourth Amendment. Nothing in the majority opinion provides
any justification for departing from this rule. Attorney Gen-
eral Ashcroft is entitled to qualified immunity.

III.    Al-Kidd’s complaint fails to allege Ashcroft instructed
          or knowingly allowed FBI agents to present false
           affidavits to the magistrate judge who issued the
                        material witness warrant.

   Al-Kidd’s remaining claim is that Ashcroft is personally
liable for al-Kidd’s detention on a material witness warrant
obtained on the basis of intentional or reckless material mis-
representations or omissions. Of course, this claim raises
totally different constitutional issues than that based on pre-
text.

   It is not disputed that al-Kidd has a clearly established con-
stitutional right not to be detained on a warrant based on an
agent’s deliberate or reckless misrepresentations or omissions.
See Franks v. Delaware, 

, 164-72 (1978). But it
was Ashcroft’s subordinates, not Ashcroft himself, who
obtained the material witness warrant on which al-Kidd was
detained. Al-Kidd makes only conclusory allegations Ash-
croft ordered his subordinates to arrest individuals on invalid
warrants. But such conclusory allegations do not suffice.
Before we reach the merits of al-Kidd’s claims the affidavits
were false, we must determine if he alleges facts sufficient to
establish Ashcroft’s personal liability. I disagree with the
majority’s conclusion that Ashcroft may be held liable for
what his subordinates may have done here, because al-Kidd’s
                          AL-KIDD v. ASHCROFT                         12345
complaint simply does not state facts that plausibly establish
Ashcroft, “through [his] own actions,” violated al-Kidd’s
rights under the material witness warrant statute or the Consti-
tution. 

.

   The majority concludes Ashcroft may be held liable in al-
Kidd’s Bivens action for his “knowing failure to act” in the
light of evidence of unauthorized abuses, and that al-Kidd’s
pleadings are sufficient to establish plausibly that Ashcroft
had knowledge of “abuses” occurring under § 3144 and failed
to act to correct these abuses.13 Maj. Op. at 12315-16.

   What “abuses”? The abuses to which al-Kidd refers in his
allegations are not lies or omissions included in supporting
affidavits, but pretextual arrests. But, as shown above (in Part
II, “Qualified Immunity”), such “abuses” violate neither the
statute nor the Constitution. And to allege Ashcroft’s knowl-
edge of these “abuses” does not allege facts that plausibly
establish Ashcroft knew of or encouraged his subordinates
recklessly to disregard the truth in the preparation of support-
ing affidavits. See 

.

  In reviewing al-Kidd’s allegations regarding Ashcroft’s
personal involvement, ask yourself after each one, “Did al-
Kidd here allege facts that plausibly establish Ashcroft
  13
    Ashcroft cannot be held liable for the acts of his subordinates on a the-
ory of respondeat superior or vicarious liability. 

It is doubtful
that the majority’s “knowing failure to act” standard survived Iqbal.
There, the Court held that Ashcroft could not be held liable for his
“knowledge and acquiescence” in his subordinates’ alleged unconstitu-
tional discrimination against Muslim men after 9/11. 

. The
Court explained: “[P]urpose rather than knowledge is required to impose
Bivens liability on the subordinate for unconstitutional discrimination; the
same holds true for an official charged with violations arising from his or
her superintendent responsibilities.” 

. Here, because al-Kidd has
not alleged that Ashcroft knew his subordinates were making deliberate or
reckless material misrepresentations or omissions in material witness
applications, much less that it was Ashcroft’s purpose they do so, al-
Kidd’s allegations clearly fail Iqbal’s requirements.
12346                AL-KIDD v. ASHCROFT
ordered or knowingly tolerated agents swearing to false facts
in their affidavits?”:

    •   Ashcroft stated publicly that “[a]ggressive deten-
        tion of lawbreakers and material witness warrants
        is vital to preventing, disrupting, or delaying new
        attacks.”

    •   A Justice Department policy memo stated that
        federal law enforcement personnel were to use
        “every available law enforcement tool” to arrest
        terror “suspects.” This included the use of “ag-
        gressive arrest and detention tactics.”

    •   One Justice Department official admitted that the
        material witness policy amounted to “preventive
        detention.”

    •   Other Justice Department officials admitted that
        material witness warrants were an important “in-
        vestigative tool” whereby they could obtain “evi-
        dence” about the witness. Similarly, FBI Director
        Mueller stated that several “suspects” had been
        detained on material witness warrants.

    •   One news report stated that 50% of those
        detained on material witness warrants were never
        called to testify. One Justice Department official
        admitted that this statistic proved that material
        witness warrants were a “ruse” to detain suspects.

    •   “Abuses” occurring under the statute were
        “highly publicized” in the media.

    •   The department apologized to several individuals
        arrested on material witness warrants.

In each case, the answer to the question put is a flat “no.”
These allegations certainly do suggest Ashcroft encouraged
                     AL-KIDD v. ASHCROFT                  12347
prosecutors to use valid material witness warrants as a means
to accomplish other law-enforcement objectives. But none of
the allegations contain facts that plausibly establish Ash-
croft’s knowledge that his subordinates were obtaining mate-
rial witness warrants on the basis of deliberately or recklessly
false evidence or on facially invalid warrants. Some of al-
Kidd’s allegations suggest precisely the opposite—that Justice
Department officials were careful to ensure they had probable
cause to believe that the targeted witness had information
material to a criminal proceeding and was likely to flee before
seeking a material witness warrant:

    •   David Nahmias, Counsel to the Assistant Attor-
        ney General, stated that when they were unable
        to charge a particular suspect, they “got enough
        information at least to make him a material wit-
        ness.” ER 32 (emphasis added).

    •   Attorney General Alberto Gonzales, Ashcroft’s
        successor, stated that when the agency became
        interested in a subject, the agency would “consid-
        er” its options. ER 31.

Al-Kidd’s pleadings do establish that some material witnesses
were detained who did not testify or did not prove to have
material information. But these facts do not plausibly suggest
federal agents employed intentional or reckless mendacity in
swearing out false affidavits. Some witnesses’ testimony may
not have been required because defendants took plea deals or
prosecutors found other sources of information. In some
cases, agents may simply have been wrong or may have acted
“hastily” or negligently in conducting investigations. That
does not amount to a Franks violation. See 

. That the DOJ apologized to some detainees hardly
suggests an admission of impropriety rather than simple error.

   The majority also concludes al-Kidd has plausibly alleged
that Ashcroft “purposely instructed his subordinates to bypass
12348                 AL-KIDD v. ASHCROFT
the plain reading of the statute.” Maj. Op. at 12316. All of the
allegations the majority cites in support of this proposition
demonstrate Ashcroft “purposely instructed” his subordinates
to use the statute pretextually, but not unlawfully. The major-
ity doesn’t get it; al-Kidd must plead not only that Ashcroft
had a “concerted strategy” or that Ashcroft used “enhanced”
techniques, Maj. Op. at 12318, but that such “concerted strat-
egy” or “enhanced” techniques actually included the use of
false affidavits or facially invalid warrants, not just the use of
pretextual witness warrants. A “concerted strategy” or “en-
hanced” technique to “misuse” material witness warrants is
not enough, unless such “misuse” includes the use of false
affidavits, not just pretextual arrest warrants. And nothing in
al-Kidd’s allegations plausibly suggests Ashcroft instructed,
encouraged, or tolerated his subordinates to detain individuals
as to whom there was no objective probable cause to arrest.
It may be conceivable to al-Kidd that Ashcroft encouraged his
subordinates to flout the requirements of § 3144, but al-
Kidd’s allegations have not “nudged [his] claims across the
line from conceivable to plausible.” Bell Atlantic Corp. v.
Twombly, 

, 570 (2007).

   Because al-Kidd has not pleaded adequately that Ashcroft,
by his own actions, violated al-Kidd’s constitutional rights, I
dissent from part B.4 of the majority opinion.

                   IV.    Absolute Immunity

   The remaining question is whether and to what extent Ash-
croft enjoys absolute immunity for his alleged actions—and
inactions—related to the issuance of material witness war-
rants. As explained above, I conclude all of al-Kidd’s claims
are precluded on other grounds. Accordingly, were it up to
me, I would not reach this question. However, because the
majority addresses the issue, and because I think the majori-
ty’s “immediate purpose” test is difficult to define and apply,
and is unsupported by case law, I will explain my disagree-
ment.
                          AL-KIDD v. ASHCROFT                        12349
   In Imbler v. Pachtman, 

(1976), the Supreme
Court held that a prosecutor enjoyed absolute immunity from
suit by a former inmate, whose conviction had been set aside
in collateral proceedings. The former inmate’s suit alleged
that the prosecution had been commenced wrongfully, that the
prosecutor had elicited false testimony on the stand, and that
the prosecutor concealed exculpatory evidence from the
defense, actions even more heinous than those alleged against
Ashcroft by al-Kidd. 

The court articulated two
justifications for imposing an absolute bar to recovery: first,
absolute prosecutorial immunity reflects the common law
immunity of judges and juries, 

second, absolute
immunity is necessary to avoid the “intolerable burdens” that
damages claims by disgruntled criminal defendants would
place on prosecutors, 

Absolute prosecutorial
immunity obviously leaves some wrongs—grievous wrongs
—unremedied, but the “balance of evils” nonetheless tilts in
favor of absolute immunity; otherwise, prosecutors would live
in constant fear that their actions on behalf of the public
would subject them to personal liability and possible poverty.
Van de Kamp v. Goldstein, 

, 859 (2009).

   However, despite the tremendous importance of absolute
immunity, prosecutors do not enjoy absolute immunity for
every act they undertake as prosecutors. To determine
whether a prosecutor enjoys absolute immunity, rather than
the lesser qualified immunity afforded all government agents,
   14
      Justice Scalia has observed that the doctrine of absolute prosecutorial
immunity has strayed far from its common law roots, but that the doctrine
nonetheless retains its vitality. See Kalina v. Fletcher, 

,
131-135 (1997) (Scalia, J., concurring) (“[T]he ‘functional categories’
approach to immunity questions imposed by cases like Briscoe, make
faithful adherence to the common law embodied in § 1983 very difficult.
But both Imbler and the ‘functional’ approach are so deeply embedded . . .
that, for reasons of stare decisis, I would not abandon them now.”).
Accordingly, Ashcroft’s failure to introduce evidence that, at common
law, prosecutors had absolute immunity against claims related to material
witness warrants is not significant.
12350                     AL-KIDD v. ASHCROFT
courts consider the “the nature of the function performed, not
the identity of the actor who performed it.” 

. Under the “functional approach,” a prosecutor enjoys
prosecutorial immunity only when he performs a function “in-
timately associated with the judicial phase of the criminal pro-
cess.” 

. On the other hand, a
prosecutor has no absolute immunity for “those aspects of the
prosecutor’s responsibility that cast him in the role of an
administrator or investigative officer rather than that of an
advocate.” 

The Imbler court acknowledged that
“drawing a proper line between these functions may present
difficult questions.” 

n.33.

   Deciding which witnesses to call at trial is part of the pros-
ecutor’s role as an advocate, 

n.33, as
is the “marshaling” of evidence for trial, Genzler v. Longan-
bach, 

, 639 (9th Cir. 2005). Accordingly, several
circuits, other than the Ninth, have squarely held that prosecu-
tors have absolute immunity for seeking a material witness war-
rant.15 And no case has held that absolute immunity does not
shield a prosecutor’s decision to seek such a warrant.

  Ashcroft, of course, did not himself file the application or
swear out the facts in support of the application. Ashcroft
acted only as a supervisor. Though a supervisor’s acts are in
   15
      See, e.g., Odd v. Malone, 

, 213 (3rd Cir. 2009) (noting
that a prosecutor has prosecutorial immunity for obtaining a material wit-
ness warrant shortly before the commencement of trial, but holding that
the prosecutor lacks absolute immunity for failing to notify the court that
trial was over and thus permit the witness’s release); Betts v. Richard, 

, 81 (2d Cir. 1984) (“It is clear that the issuance of the capias was
intimately associated with procuring attendance of a witness for imminent
trial. Absolute immunity attaches to this act, and any claimed improper
motive is irrelevant.”); Daniels v. Keiser, 

, 69 (7th Cir. 1978)
(“Because defendant was attempting to secure Daniels’ presence at the
resumption of the trial[,] . . . he was functioning as an advocate rather than
as an investigator.”); White ex rel. Swafford v. Gerbitz, 

, 665
n.4 (6th Cir. 1988) (stating, in dicta, that prosecutor’s decision to procure
a material witness warrant is protected by absolute immunity).
                         AL-KIDD v. ASHCROFT                        12351
one sense always administrative, a supervisor enjoys absolute
immunity only for supervisory decisions that “require legal
knowledge and the exercise of related discretion” and relate
to activities for which the supervised attorney enjoys absolute
immunity. Van de 

-62 (holding that
a prosecutor enjoyed absolute immunity from Goldstein’s
claims that supervisor’s failure to train prosecutors about the
need to disclose exculpatory evidence resulted in his unlawful
conviction). There is “no meaningful distinction between a
decision on prosecution in a single instance and decisions on
prosecutions formulated as a policy for general application.”
Roe v. City & County of San Francisco, 

, 583-84
(9th Cir. 1997).

   Kalina v. Fletcher makes clear Ashcroft lacks absolute
immunity for claims related to his supervision of the FBI
agents, such as Mace, who acted as witnesses in support of a
warrant application. 

. When an individ-
ual, even an attorney, serves as a complaining witness in sup-
port of a warrant application, the individual enjoys only
qualified immunity, 

Ashcroft lacks abso-
lute immunity for supervising such individuals. See 

. Whether Ashcroft enjoys absolute immunity
for his supervision of the United States Attorneys who pre-
pared the warrant application and made the decision to file it
is a different question.

   I would hold that so long as the “criminal proceeding” for
which the material witness warrant is sought is a criminal
trial, rather than an investigatory proceeding,16 the decision to
seek a material witness warrant should be shielded by abso-
lute immunity. Such a decision is clearly one “intimately
  16
    See Buckley v. Fitzsimmons, 

, 274-75 (1993) (holding
that a prosecutor lacked absolute immunity for acts taken in preparation
for appearing before an investigatory grand jury); see also 

(noting that a material witness warrant may issue to secure the
presence of a witness before an investigative grand jury proceeding).
12352                     AL-KIDD v. ASHCROFT
associated with the judicial phase of the criminal process.”

; see also supra note 14. The critical
factor in the decision to seek a material witness warrant is the
prosecutor’s professional judgment about how much that wit-
ness knows, how important the witness’s testimony might be,
and what effect his arrest may have on his testimony. See

(holding that absolute immunity pro-
tects decisions involving the “exercise of professional judg-
ment”). And the ultimate decision whether to call the detained
witness depends on the prosecutor’s final trial strategy, which
may evolve over time as events unfold. See 

(holding that a prosecutor’s decision not to call a wit-
ness at trial was protected by absolute immunity). Both of
these decisions are decisions that only a prosecutor can make.

   Moreover, like other quasi-judicial acts, an individual’s
detention on a material witness warrant is subject to continu-
ing oversight, and errors may be corrected through the judicial
process. Cf. 

(holding that a pros-
ecutor did not enjoy absolute immunity for his decision to
engage in illegal wiretapping and explaining that the judicial
process, unlike wiretapping, is “largely self-correcting: proce-
dural rules, appeals, and the possibility of collateral chal-
lenges obviate the need for damages actions to prevent unjust
results”).17 Here, Al-Kidd was not detained up until the start
  17
     The Third Circuit’s decision in Odd did not, as the majority con-
cludes, hold that the policy considerations underlying absolute immunity
do not apply in the material witness context. 

. In Odd, no one
questioned that the decision to seek a material witness warrant was pro-
tected by absolute immunity. The issue in Odd was the prosecutor’s “fail-
[ure] to notify the court of the status of a detained witness.” 

As
the court noted, compliance with Rule 46, once trial is complete or during
a “clearly delimited” break in judicial proceedings, is a purely ministerial
task. 

Unlike the decision whether to call a witness to the
stand, the decision to release a material witness once trial is over requires
the exercise of no professional judgment at all, and the threat of civil dam-
ages liability cannot interfere with the prosecutor’s decision making. 

It is unsurprising that the Third Circuit found that the detained
                          AL-KIDD v. ASHCROFT                          12353
of trial, but was released upon conditions, selected by a neu-
tral magistrate, thought necessary to secure his appearance as
a witness at trial.

   Ultimately, the decision whether to seek a material witness
warrant in conjunction with an upcoming trial is akin to both
the decision to call a witness at trial and to seek a warrant to
arrest a suspect. A prosecutor enjoys absolute immunity for
both of these acts, regardless of any improper motive, and
should enjoy a similar immunity here. See 

n.33; 

.

   Both the majority and al-Kidd concede that a prosecutor
sometimes has absolute immunity for the decision to seek a
material witness warrant. See Maj. Op. at 12284-85. The
majority, returning to its trope the prosecutors’ pretextual
motivations invalidate an otherwise properly obtained war-
rant, see Maj. Op. at 12290, contends, however, the cases
holding a prosecutor has absolute immunity for the issuance
of a material witness warrant—Odd, Betts, Daniels, and
Swafford—are distinguishable because none involved allega-
tions a prosecutor intended to use the warrant to investigate
the detained subject rather than to secure the witness’s
appearance at trial. See Maj. Op. at 12284-85.18

material witnesses lacked access to continuing supervision; in Odd the
plaintiffs’ very claim was that they had been wrongfully denied the proce-
dural protections to which they were entitled. 

(“Indeed, the fail-
ure of the ADAs to notify anyone of Plaintiffs’ status assured that not even
the warrant-issuing judges would review the propriety of their continued
detention, thus short-circuiting the crucible of the judicial process.” (inter-
nal quotation marks omitted)). The ADAs had no more right to hold the
material witness after the trial ended than they would have had to hold a
defendant after an acquittal was entered.
   18
      The odd result of the majority’s approach is that Ashcroft enjoys abso-
lute immunity if he acts out of racial or partisan animus, but enjoys only
qualified immunity if he acts in order to protect the public or investigate
a suspected criminal. See Bernard v. County of Suffolk, 

, 504
(9th Cir. 2004). Thus, the more licit Ashcroft’s subjective intentions, the
more liability he faces.
12354                     AL-KIDD v. ASHCROFT
   Rejecting what it calls a “formalistic taxonomy of acts that
are inherently either prosecutorial or investigative, regardless
of what each act is really serving to accomplish” in favor of
a “teleological perspective,” Maj. Op. at 12289 (emphasis
added), the majority applies an “immediate purpose” test to
determine whether a prosecutor is performing an investigative
rather than a prosecutorial function—if the prosecutor’s “im-
mediate purpose” was to investigate the subject of the warrant
rather than to secure the witness’s appearance at trial, the
prosecutor enjoys only qualified, rather than absolute, immu-
nity. 

Again the majority invites inquiry into the
subjective motivations of individual officers. One can tell that
easily: watch for its use of the word “really.”

   It is true that a few courts have made reference to “pur-
pose” in applying the functional approach.19 But the “pur-
pose” considered in these cases has been the product for
which the warrant was directed—what evidence was called
for and where it was to be produced; none of these cases
authorizes the majority’s wide-ranging inquiry into what a
prosecutor was “really” up to. See 

Indeed, as in
the Fourth Amendment context, courts have repeatedly
admonished that a prosecutor’s subjective intentions are irrel-
evant to the absolute immunity inquiry, for much the same
reason they are irrelevant to the qualified immunity analysis.
See, e.g., Ashelman v. Pope, 

, 1078 (9th Cir.
   19
      See, e.g., 

(holding that prosecutor lacked
absolute immunity for actions before a grand jury because the grand jury’s
“immediate purpose was to conduct a more thorough investigation of the
crime—not to return an indictment against a suspect against whom there
was already probable cause to arrest”); KRL v. Moore, 

,
1115 (9th Cir. 2004) (denying absolute immunity where a search warrant
was “to further a ‘stand-alone investigation’ into environmental crimes”);
Guzman-Rivera v. Rivera-Cruz, 

, 30-31 (1st Cir. 1995) (“The
mixed purpose of the civil rights investigation reflects defendants’ own
mixed functions.”); Hill v. City of New York, 

, 662 (2d Cir.
1995) (“To the extent that the creation of the videotapes fulfilled an inves-
tigatory purpose, Adago cannot claim absolute immunity.”).
                     AL-KIDD v. ASHCROFT                   12355
1986) (en banc) (“Intent should play no role in the immunity
analysis.”); see also 

(2d Cir. 1984)
(“Absolute immunity attaches to [seeking a material witness
warrant], and any claimed improper motive is irrelevant.”).
The cases the majority cites are not to the contrary.

   In Buckley, the Supreme Court held that a prosecutor
lacked absolute immunity for fabricating evidence to present
to a grand jury because the grand jury’s “immediate purpose
was to conduct a more thorough investigation of the crime—
not to return an indictment against a suspect against whom
there was already probable cause to 

. Buckley simply reflects the general rule that a prose-
cutor should not “consider himself to be an advocate before
he has probable cause to have anyone arrested.” 

. In
Buckley, no one had been arrested; the grand jury was still
investigating. Here, Al-Hussayen had been indicted, arrested,
arraigned, and was awaiting trial. Buckley merely holds that
a prosecutor who, as yet, had arrested no one, was acting as
an investigator, not an advocate. Buckley does not hold that
what “really” motivated a prosecutor is relevant to determina-
tion of what “function” the prosecutor was accomplishing
when he performed the action complained of.

   Neither does KRL v. Moore. In that case, we held that
whether a prosecutor had absolute immunity for the issuance
of a search warrant depended on the purpose of the warrant,
not of the prosecutor in seeking the 

.
After executing a search warrant on land held by KRL, a gen-
eral partnership, prosecutors indicted Robert Womack, one of
the partners, on counts relating to improper waste disposal on
partnership land. 

The prosecutor then obtained a
second search warrant for documents related to fraud and ille-
gal diversion of funds. 

1113. The partnership and
the partners sued under § 1983, alleging that this second
search warrant was overbroad, facially invalid, and based on
fraudulent affidavits. 

court denied the prosecu-
tor’s absolute immunity claim. On appeal, this court noted
12356                AL-KIDD v. ASHCROFT
that the second search warrant had “two goals: it sought evi-
dence to prosecute the pending indictment against Womack,
and it sought to investigate and uncover new crimes.” 

We held that the prosecutor enjoyed absolute immunity
for the search warrant to the extent it sought evidence to
prove the pending charges. 

However, to the
extent the prosecutor sought evidence of new crimes (fraud at
KRL), the prosecutors lacked absolute immunity. 

   We did not inquire into the prosecutor’s motives in seeking
the second search warrant. We inquired into the purpose of
the warrant by looking to what evidence the search warrant
recited it sought. That evidence was not possibly related to the
prosecution of Womack, the one suspect who had been
arrested, for illegally dumping toxic wastes; it was evidence
of fraud and diversion of funds that had nothing to do with
waste disposal. 

It does not take a mind-reader to
determine that where the subject matter of the prosecution is
illegal toxic waste disposal on partnership land, a search war-
rant to search for evidence of fraud and illegal diversion of
business funds is designed to accomplish something other
than proving the elements of the charged environmental
crime. It merely requires reading the warrant.

   Buckley and KRL are easy to apply here: if the material wit-
ness warrant on which Al-Kidd had been detained sought to
force his appearance at an investigatory proceeding or a
police interview, rather than a criminal trial, Ashcroft would
not enjoy absolute prosecutorial immunity. The only relevant
“purpose” is that derived from the product of the warrant, not
what was “really” the prosecutor’s motive in seeking the war-
rant.

  To the extent that KRL authorizes any inquiry into what
was “really” the prosecutor’s motivation, such an inquiry
should be strictly limited to cases where a prosecutor
approves a search warrant application, because seeking the
                          AL-KIDD v. ASHCROFT                          12357
issuance of a search warrant can be an investigative function,
while seeking an arrest warrant cannot. The KRL court itself
carefully limited its holding to the search warrant context, and
expressly distinguished the arrest warrant context. 

(“We must emphasize that our result would not necessarily be
the same had the prosecutors reviewed an arrest warrant,
rather than a search warrant, prior to submission. As 

, the Court has stated that a prosecutor does not serve as
an advocate before probable cause to arrest anyone has been
established, Buckley . . ., but that the determination of whether
probable cause exists to file charging documents is the func-
tion of an advocate . . . .”). Preparing a search warrant is not
a “core” advocacy function like the preparation of an arrest
warrant, the filing of charges, or the preparation of a material
witness warrant.20

   But under the majority’s approach, what was “really” a
prosecutor’s personal, subjective “immediate purpose” is
always relevant to the determination whether absolute immu-
nity protects any act by a prosecutor—in court or out of court.
A prosecutor would lose his absolute immunity if he prose-
cutes a low-level mafia functionary for the sole purpose of
inducing that functionary to testify against his capo. And,
absolute immunity would not clothe any question asked by a
prosecutor of a witness on the stand; the prosecutor could be
sued for damages on the claim he “really” asked the question
  20
     See generally Schrob v. Catterson 

, 1413-15 (3d Cir.
1991) (distinguishing “core” prosecutorial functions and describing search
warrants as in the “gray area” between investigative and prosecutorial
functions); see also Joseph v. Patterson, 

, 556-57 (6th Cir.
1986) (recognizing that search warrants can serve both a prosecutorial
function of preparing for trial and an investigative function of gathering
evidence, and holding that further factual development was required to
determine the role the search warrant played); 

n.1
(“Preparation, both for the initiation of the criminal process and for a trial,
may require the obtaining, reviewing, and evaluation of evidence. At some
point, with respect to some decisions, the prosecutor no doubt functions as
an administrator . . . .” ) (emphasis added).
12358                AL-KIDD v. ASHCROFT
to assist in the investigation of the witness, or some other per-
son, for other crimes. Of course, what the prosecutor “really”
intended in asking the question would—as in all inquiries into
intent—be a factual inquiry, entailing precisely the kind of
expensive discovery and litigation immunity was designed to
avoid. See 

.

   Not so, says the majority. To “cabin” this obviously prob-
lematic result, the majority states that when a prosecutor
brings any prosecution, the prosecutor’s “immediate purpose”
is, of course, to bring a prosecution, even if the prosecutor’s
true intention is to obtain evidence for some other investiga-
tion. Maj. Op. at 12290. But there is no principled reason this
is true, other than the majority’s say-so. And, if true, why
isn’t the prosecutor’s “immediate purpose” in this case to
secure a witness’s appearance at trial rather than to obtain evi-
dence against al-Kidd? The majority provides no clues as to
how we are to distinguish which purposes are “immediate”
and which are “really” not.

   Even were the “immediate purpose” test coherent, it would
nonetheless be undesirable because of the incentives it
creates. The prosecutors’ ultimate decision not to call al-Kidd
to the stand features prominently in al-Kidd’s proof that their
“immediate purpose” was not to obtain a conviction against
Al-Hussayen. Subjecting prosecutors to liability for such a
decision risks needless interference in the prosecutor’s con-
duct of his most public function: the presentation of evidence
at trial and, indeed, deciding whether to have a trial at all.
Worse, the majority’s test makes it prudent for a prosecutor
to go to trial against a defendant simply to ensure that his
actions in preparing for trial will not become subject to attack
on the grounds they were “really” designed to accomplish
some other goal.
                         AL-KIDD v. ASHCROFT                         12359
                            V.    Conclusion

   The majority opinion closes with a quote from Blackstone.
What Blackstone describes and condemns therein—the indefi-
nite and secret detention of individuals accused of no crime
in harsh conditions—is simply not a description of this case.
Even the majority agrees that the harsh conditions of al-
Kidd’s confinement are not before us because al-Kidd has not
adequately pleaded John Ashcroft’s personal responsibility
for such conditions. Al-Kidd’s confinement was neither indef-
inite nor in secret. He was detained on a warrant issued by a
neutral magistrate. The duration of that confinement was sub-
ject to continuing judicial supervision. There is no allegation
that al-Kidd was held incommunicado. Nor is there any alle-
gation al-Kidd was somehow denied the right to petition for
a writ of habeas corpus, a right that has long secured individu-
als’ freedom from the horrors Blackstone envisioned. We are
not called upon to judge the constitutionality of the material
witness statute. And we are not called upon to judge whether
al-Kidd should be released, only whether he is entitled to pro-
ceed in his suit to recover money damages from the pocket of
a cabinet-level official. Were we presented with the Black-
stonian case the majority envisions, I would surely agree.21
But we are not, and for the reasons explained above, I dissent
in part and concur in part.




  21
    Although I would distance myself from a certain measure of bristling
righteousness in its remarks that al-Kidd was a U.S. citizen, married and
with children at the time of his arrest. Maj. Op. at 12270. For all of that,
his rights under the Constitution against unlawful arrest were no greater
than those of an illegally entered, Mexican, childless spinster.
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