We took this case en banc to clarify a number of issues in this circuit surrounding parole-related searches. We hold that, before conducting a warrantless search pursuant to a properly imposed parole condition, law enforcement officers must have probable cause to believe that the parolee resides at the house to be searched. In this case, they did. We do not, however, decide whether law enforcement officers also need particularized suspicion of wrong-doing before conducting such a search because, while this appeal was pending, the Supreme Court granted certiorari on that issue. It is sufficient for us to conclude that, at the time the officers searched plaintiffs' home, it was not clearly established that any suspicion of wrong-doing on the part of the parolee was needed.

Accordingly, we affirm the grant of summary judgment in favor of the officers on the illegal search claim. Also, we affirm the dismissal of the Monell claims against former LAPD police chiefs Parks and Gates, but reverse the summary judgment to Officer Kading on the excessive force claim.

The material facts, as construed in the light most favorable to plaintiffs, are as follows.1 On February 20, 1998, Janae Jamerson, a member of the Four Trey Crips gang, was released on parole from state prison. As a condition of his parole, Jamerson was required to consent that his person, residence, and any property under his control could be searched at any time, by any agent of the Department of Corrections or any other peace officer, with or without a warrant. See Cal.Penal Code § 3067.2

During the month of January 1999, Darla Motley, Jamerson's then-girlfriend, moved into an apartment located at 416 East 40th Place in Los Angeles. At some point, Jamerson also lived there. However, Motley testified that "everything" was in her name and that she paid the rent and all bills associated with the apartment. Jamerson's mother and brother lived in another apartment at that address. On February 3, 1999, Jamerson was taken back into custody as a result of a parole violation. A few days later, Motley gave birth to their son, Juan Jamerson.

Approximately six weeks later, on the morning of March 18, 1999, Los Angeles Police Department Officer Albert Ruegg held a briefing for LAPD officers, officers from the federal Bureau of Alcohol, Tobacco and Firearms, and California state parole officers regarding the planned searches of ten parolees' residences in the Newton Street area. These officers were all part of the Newton Street task-force, a combined state and federal effort organized in November of 1998 to combat gang-related violence and criminal activity. In March 1999, the task force was investigating the sudden rise in shootings and armed robberies taking place in the Newton Street area. Janae Jamerson was one of the ten parolees with gang connections identified to be living in the Newton Street area in the spring of 1999. The officers concede they had no reasonable suspicion to believe that Jamerson was then-involved in any crime; they were simply contacting and searching local parolees with gang connections as a way to "clean up" the Newton Street neighborhood.

Sometime before March 18, Officer Ruegg had directed a member of his team to prepare "packages" on suspected gang-member parolees in the Newton Street area. The proper preparation of a package entailed verifying whether a parolee was on active parole and compiling address and identifying information. Ruegg was informed that Jamerson's last known address was the apartment at 416 East 40th Place and that he was on active parole. During the March 18 briefing, the officers charged with preparing the packages relayed the pertinent information to the members of the various search teams.

At approximately 10:00 or 10:30 that morning, four task-force officers from the various agencies went to search what they believed to be Jamerson's residence. The two ATF officers, James Black and Larry Webster, proceeded to the rear of the apartment unit; California Parole Agent Guadalupe Sanchez and LAPD officer Gregory Kading went to the front door and knocked loudly.

Motley testified at her deposition that when she came to the door, Kading identified himself as an LAPD officer, said that he was there with Jamerson's parole officer, and asserted that they had a warrant to search the apartment. In fact, the officers did not have a warrant, and Jamerson's parole officer was not present. An exchange regarding Jameron's whereabouts ensued. Motley told the officers that Jamerson did not live there and that he was in custody. One of the officers replied that Jamerson had been released three days earlier. Motley countered that she knew Jamerson was still in custody. The officers then asked who was inside with her, and Motley replied that only she and her five-week-old son, Juan, were at home. Finally, one of the officers told Motley that they needed to conduct the search and that if she did not let them in, they would arrest her for interfering with the search and Juan would be put in foster care. At this point, Motley unlocked the security gate and Kading, Sanchez, and Black entered the apartment. With their firearms drawn, Kading and Black searched the house for Jamerson; Webster eventually joined the others, but remained primarily in the living room.

During the search, Kading entered Motley's bedroom with his firearm unholstered. Juan was lying on Motley's bed in the bedroom. According to Motley, upon entering the room, Kading pointed his gun at Juan and kept the firearm trained on the infant while he searched the room; Kading put his gun away only when another officer came in and helped him examine a box at the foot of the bed. The officers spent at least twenty minutes searching Motley's bedroom.

After the officers left, Motley called Jamerson's parole officer, Ms. Smith, and told her that officers had come and searched her entire home. Ms. Smith stated that she did not authorize the search and confirmed that Jamerson was still in custody. A few weeks after the search of her residence, Motley moved to San Pedro, because she said that she was afraid to stay in the Newton Street area with her son.

Motley, on behalf of herself and her son Juan, filed a § 1983 action alleging that the officers violated their Fourth Amendment rights, used excessive force, and conspired to violate their Fourth Amendment and equal protection rights, and that the law enforcement agencies were liable for the officers' actions under Monell v. Department of Social Services, 436 U.S. 658, 98 S. Ct. 2018, 56 L. Ed. 2d 611 (1978). The officers moved for summary judgment asserting that they were immune from suit. The district court agreed and granted summary judgment on all claims. Motley argues on appeal that the officers were not entitled to qualified immunity for the unlawful search, the use of excessive force against her infant son, and the Monell claims against Gates and Parks.3

A private right of action pursuant to 42 U.S.C. § 1983 exists against law enforcement officers who, acting under the color of authority, violate federal constitutional or statutory rights of an individual. See Wilson v. Layne, 526 U.S. 603, 609, 119 S. Ct. 1692, 143 L. Ed. 2d 818 (1999). The defense of qualified immunity, however, shields an officer from trial when the officer "reasonably misapprehends the law governing the circumstances she confronted," even if the officer's conduct was constitutionally deficient. Brosseau v. Haugen, 543 U.S. 194, 125 S. Ct. 596, 599, 160 L. Ed. 2d 583 (2004) (per curiam).

In Saucier v. Katz, 533 U.S. 194, 121 S. Ct. 2151, 150 L. Ed. 2d 272 (2001), the Supreme Court laid out the framework for determining an officer's entitlement to qualified immunity. The threshold inquiry requires a court to ask, "[t]aken in the light most favorable to the party asserting the injury, do the facts alleged show the officer's conduct violated a constitutional right?" Id. at 201, 121 S. Ct. 2151. The inquiry ends at this stage if no constitutional right is found to have been violated; the plaintiff cannot prevail. Id. If, on the other hand, the plaintiff's allegations do make out a constitutional injury, then the court must determine whether that constitutional right was clearly established at the time of the violation. Id. If the right was not clearly established, the qualified immunity doctrine shields the officer from further litigation. Id. Finally, even if the violated right was clearly established, the Saucier court recognized that it may be difficult for a police officer fully to appreciate how the legal constraints apply to the specific situation he or she faces. Under such a circumstance, "[i]f the officer's mistake as to what the law requires is reasonable, ... the officer is entitled to the immunity defense." Id. at 205, 121 S. Ct. 2151.

The parties urge us to skip the first step of the Saucier analysis. They ask us to assume that the officers violated Motley's constitutional rights by conducting a warrantless and suspicionless search of her apartment without sufficient reason to believe Jamerson lived there, and determine whether those rights were clearly established at the time of the search. The Supreme Court has placed strong emphasis on the need to concentrate at the outset on the definition of the constitutional right. See Brosseau, 125 S.Ct. at 598; Hope v. Pelzer, 536 U.S. 730, 736, 122 S. Ct. 2508, 153 L. Ed. 2d 666 (2002); Saucier, 533 U.S. at 201, 121 S. Ct. 2151. The threshold inquiry is intended to "set forth principles which will become the basis for a holding that a right is clearly established" in later cases. Saucier, 533 U.S. at 201, 121 S. Ct. 2151. "This is the process for the law's elaboration from case to case," and "[t]he law might be deprived of this explanation were a court simply to skip ahead to the question whether the law clearly established that the officer's conduct was unlawful in the circumstances of the case." Id.; see also Wilson, 526 U.S. at 609, 119 S. Ct. 1692 ("Deciding the constitutional question before addressing the qualified immunity question also promotes clarity in the legal standards for official conduct, to the benefit of both the officers and the general public."); Robinson v. Solano County, 278 F.3d 1007, 1012-13 (9th Cir.2002) (en banc) (discussing Saucier).

Given the Supreme Court's emphasis on our duty to clarify the constitutional standards governing law enforcement officers in the performance of their duties, we find it necessary to decide, first, what level of knowledge the officers needed to support the belief that Jamerson resided at the 40th Place address. In other words, how certain did they have to be that they were at the right residence?

However, resolution of the related constitutional issue, whether the officers also needed particularized suspicion of wrong-doing on Jamerson's part, poses unique circumstances that warrant deviating from Saucier's threshold inquiry. The Supreme Court has granted certiorari in Samson v. California on the precise issue involved in this case. See ___ U.S. ___, 126 S. Ct. 34, 162 L. Ed. 2d 933 (2005).4 Thus, the very justification for Saucier's first step is inapplicable; avoiding the constitutional question will not impede the elaboration of constitutional principles, and answering the constitutional question would foster neither certainty nor finality. The confluence of our consideration of this case en banc and the Supreme Court's concurrent review of the same issue presents an extraordinary circumstance not before presented.5 In this unusual circumstance, we bypass Saucier's first step and decide only whether it was clearly established at the time of the search that the officers needed some suspicion of wrongdoing.

A. Probable Cause Is Needed to Establish Residence

Where a law enforcement officer's observations support "a reasonable belief" that a parolee resides at a particular address, this "provide[s] a reasonable basis for [a parole] search." United States v. Dally, 606 F.2d 861, 863 (9th Cir.1979) (per curiam). We have not had occasion to elaborate further the underpinnings of our analysis in the context of a parole search. Nevertheless, the development of our precedent in related contexts proves instructive.

In Perez v. Simmons, officers searched the home of Irma Perez, without her consent, while looking for her brother who was on probation and the subject of an arrest warrant. 884 F.2d 1136, 1141 (9th Cir.1989), as amended 900 F.2d 213 (9th Cir.1990), and as corrected 998 F.2d 775 (9th Cir.1993). We stated that before law enforcement officers may search a home to execute a search warrant, they must have "reasonable grounds for believing" that the subject of the warrant resides in the apartment. Id. at 1140; see also United States v. Albrektsen, 151 F.3d 951, 953-54 (9th Cir.1998) (applying same standard). In the absence of this requirement, we risk diminishing the Fourth Amendment protections owed to the homeowner.

Our subsequent decision in Watts v. County of Sacramento, 256 F.3d 886 (9th Cir.2001), comports with this holding. There, law enforcement officers received a tip that a murder suspect was living at a particular address with his girlfriend and two small children. The address differed from the suspect's last known address. When the officers arrived at the address identified by the tipster, the plaintiff answered the door. The officers observed that the plaintiff generally fit the description of the suspect; moreover, and unfortunately for the plaintiff, both the murder suspect and the plaintiff had the same first name, Chris. The officers handcuffed the plaintiff and performed a protective sweep of the house. At some point, the officers realized that they had the wrong person in custody and, after thirty to forty-five minutes, released the plaintiff and explained the mistake to him. On appeal, we reversed the district court's grant of summary judgment to the officers and held that an officer must have a "reasonable belief" that the suspect named in an arrest warrant resides in a third party's home. Id. at 889-90 (relying on Payton v. New York, 445 U.S. 573, 603, 100 S. Ct. 1371, 63 L. Ed. 2d 639 (1980)).

These cases make clear that a search conducted without consent or a search warrant is permissible only when the officers have some heightened knowledge that they are at the address where either the parolee or the subject of an arrest warrant resides. The underlying analysis fits equally well here. A reasonable parole search conducted by law enforcement officers without a warrant does not run afoul of the Fourth Amendment. See Griffin v. Wisconsin, 483 U.S. 868, 872-75, 107 S. Ct. 3164, 97 L. Ed. 2d 709 (1987). Generally, a condition of parole that permits warrantless searches provides officers with the limited authority to enter and search a house where the parolee resides, even if others also reside there. But they have to be reasonably sure that they are at the right house. Nothing in the law justifies the entry into and search of a third person's house to search for the parolee. "The Fourth Amendment's protection against unreasonable searches in a person's home is not diminished by the mere presence of a guest in the home." Perez, 884 F.2d at 1141. In other words, the parole condition indicates only the parolee's acquiescence to a warrantless search of his own residence. Absent this provision and the existence of exigent circumstances, officers must obtain consent or a warrant to enter a house. See Moore v. Vega, 371 F.3d 110, 116 (2d Cir.2004) ("Because plaintiff is not a parolee, she cannot be subjected to the same burdens upon her privacy, and the departures from the usual warrant and probable-cause requirements allowed with respect to parolees are not justified for her.").

Recently, we attempted to reconcile our previous holdings. Following analysis of federal precedent, we concluded that when it came to whether a person lives at a particular residence, the "reason to believe" or "reasonable belief" standard "should be read to entail the same protection and reasonableness inherent in probable cause." United States v. Gorman, 314 F.3d 1105, 1111-15 (9th Cir.2002); see also Watts, 256 F.3d at 890 ("Courts have generally required substantial evidence pointing to the suspect's co-resident status to create a reasonable belief that he lives in the home of a third party."); United States v. Harper, 928 F.2d 894, 896 (9th Cir.1991) (determining that police must have probable cause to believe the subject of an arrest warrant is an actual resident of a location before entering the premises to execute the warrant). We see no reason to depart from that conclusion here.

These long-prevailing standards seek to safeguard citizens from rash and unreasonable interferences with privacy and from unfounded charges of crime. They also seek to give fair leeway for enforcing the law in the community's protection. Because many situations which confront officers in the course of executing their duties are more or less ambiguous, room must be allowed for some mistakes on their part. But the mistakes must be those of reasonable men, acting on facts leading sensibly to their conclusions of probability. The rule of probable cause is a practical, nontechnical conception affording the best compromise that has been found for accommodating these often opposing interests. Requiring more would unduly hamper law enforcement. To allow less would be to leave law-abiding citizens at the mercy of the officers' whim or caprice.

Brinegar v. United States, 338 U.S. 160, 176, 69 S. Ct. 1302, 93 L. Ed. 1879 (1949).

Requiring officers to have probable cause to believe that a parolee resides at a particular address prior to conducting a parole search protects the interest of third parties. Law enforcement officers are allowed to search a parolee's residence, but they must have probable cause to believe that they are at the parolee's residence. In sum, we hold that before conducting a warrantless search pursuant to a parolee's parole condition, law enforcement officers must have probable cause to believe that the parolee is a resident of the house to be searched.

B. The Officers Had Probable Cause to Believe That Jamerson Resided with Motley

We now turn our attention to whether appellees' conduct deprived Motley of this right. Officer Ruegg supervised the Newton Street task-force; Kading, Sanchez, and Black conducted the search; and Webster was an agent in training who remained in the living room during the search. The officers contend that they reasonably relied on the information gathered by and received from the LAPD regarding Jamerson's parole status and last known address. Ruegg testified that to the best of his recollection, approximately a month before the search he assigned the task of compiling and confirming Jamerson's information to a member of his unit.6 In addition to that information, Kading testified that he had contact with Jamerson on previous occasions, including at the 416 East 40th Place residence. During at least one of those prior interactions, Jamerson and his grandmother confirmed that Jamerson lived at the location at issue. Indeed, Sanchez testified that when they arrived at the apartment building, Kading indicated that Jamerson lived in the rear unit.7 Kading additionally testified that he independently knew Jamerson was on parole.

A supervisor can be liable under § 1983 if he "set[s] in motion a series of acts by others ..., which he knew or reasonably should have known, would cause others to inflict the constitutional injury." Larez v. City of Los Angeles, 946 F.2d 630, 646 (9th Cir.1991) (internal quotation marks and brackets omitted). Liability can exist without direct participation by the supervisor. Redman v. County of San Diego, 942 F.2d 1435, 1446 (9th Cir.1991) (en banc). However, "[a]bsent some indication to a supervisor that an investigation was inadequate or incompetent, supervisors are not obliged either to undertake de novo investigations or to cross examine subordinates reasonably believed to be competent as to whether their investigations were negligent." Cecere v. City of New York, 967 F.2d 826, 829 (2d Cir.1992). There is no evidence in the record that Ruegg knew or had any reason to believe that the investigation regarding Jamerson's last known address and parole status was inadequate or incompetent.

Effective and efficient law enforcement requires cooperation and division of labor to function. For that reason, law enforcement officers are generally entitled to rely on information obtained from fellow law enforcement officers. See Whiteley v. Warden, Wyoming State Penitentiary, 401 U.S. 560, 568, 91 S. Ct. 1031, 28 L. Ed. 2d 306 (1971); United States v. Bernard, 623 F.2d 551, 560-61 (9th Cir.1980). We recently reaffirmed this principle in United States v. Jensen, 425 F.3d 698 (9th Cir.2005), where we held that, under the "collective knowledge doctrine," probable cause may be based on "the collective knowledge of all the officers involved in the investigation and all of the reasonable inferences that may be drawn therefrom." Id. at 705 (internal quotation marks omitted). We emphasized that an officer "was entitled to rely on the observations and knowledge of the others, even though some of the critical information had not been communicated to him." Id. (brackets and internal quotation marks omitted).

Typically, of course, "only one or a few officers plan and lead a search, but more — perhaps many more — help execute it. The officers who lead the team that executes a warrant are responsible for ensuring that they have lawful authority for their actions." Ramirez v. Butte-Silver Bow County, 298 F.3d 1022, 1027 (9th Cir.2002), aff'd, 540 U.S. 551, 124 S. Ct. 1284, 157 L. Ed. 2d 1068 (2004). "Line officers, on the other hand, are required to do much less." Id. at 1028. All officers, however, have an ongoing duty to make appropriate inquiries regarding the facts received or to further investigate if insufficient details are relayed. See Mendocino Envtl. Ctr. v. Mendocino County, 192 F.3d 1283, 1293 n. 16 (9th Cir.1999). We have said, for example, that when conducting a search pursuant to a warrant, the officers involved should familiarize themselves with the nature and scope of the search authorized by the warrant. See Guerra v. Sutton, 783 F.2d 1371, 1375 (9th Cir.1986). The lynchpin is whether the officer's reliance on the information was objectively reasonable. See United States v. Hensley, 469 U.S. 221, 232-33, 105 S. Ct. 675, 83 L. Ed. 2d 604 (1985).

During the briefing on the morning of the search, other officers provided appellees with Jamerson's parole status and last known address. We agree with the district court that the officers' reliance on this information was objectively reasonable. Where an officer has an objectively reasonable, good-faith belief that he is acting pursuant to proper authority, he cannot be held liable if the information supplied by other officers turns out to be erroneous. See id. at 232, 105 S. Ct. 675; United States v. Robinson, 536 F.2d 1298, 1299 (9th Cir.1976) ("A facially valid direction from one officer to another to stop a person or a vehicle insulates the complying officer from assuming per sonal responsibility or liability for his act done in obedience to the direction."). "In dealing with probable cause, ... as the very name implies, we deal with probabilities. These are not technical; they are the factual and practical considerations of everyday life on which reasonable and prudent men, not legal technicians, act." Brinegar, 338 U.S. at 175, 69 S. Ct. 1302; see also Illinois v. Rodriguez, 497 U.S. 177, 185, 110 S. Ct. 2793, 111 L. Ed. 2d 148 (1990) ("[P]robable cause ... demands no more than a proper assessment of probabilities in particular factual contexts." (internal quotation marks omitted)). Given that the appellees had probable cause to believe that Jamerson resided with Motley, they acted lawfully in searching the residence, even though it turned out that only Motley was there at the time.8

We also affirm the grant of summary judgment in favor of ATF Agent Webster on the independent ground that he did not participate in the search of the premises. See Jones v. Williams, 297 F.3d 930, 936 (9th Cir.2002) (discussing that merely being present at the scene of an alleged constitutional violation, without personal participation, is insufficient to hold individual officer liable).

Finally, we conclude that because the officers had probable cause to believe that they were at Jamerson's residence, they were entitled to maintain that belief until "presented with convincing evidence that the information they had relied upon was incorrect." Moore, 371 F.3d at 118. Motley's statement that Jamerson did not live at that address, coming from a less-than-disinterested source, did not undermine the information the officers previously had received from their advance briefing. It is not an unheard-of phenomenon that one resident will tell police that another resident is not at home, when the other resident actually is hiding under a bed when the police come to call. See, e.g., United States v. Amburn, 412 F.3d 909, 913 (8th Cir.2005) (recounting that suspect was discovered hiding under a bed after two friends claimed he had "left").

As explained above, the officers required probable cause to believe that the apartment on 40th Place was Jamerson's, and they met that burden. The next question is whether it was clearly established at the time they searched Motley's apartment that the officers required particularized suspicion of wrong-doing on Jamerson's part. For the reasons that follow, we hold that it was not.

C. It Was Not Clearly Established That Appellees Needed Any Suspicion of Wrong-Doing

"To accomplish the purpose of parole, those who are allowed to leave prison early are subjected to specified conditions for the duration of their terms. These conditions restrict their activities substantially beyond the ordinary restrictions imposed by law on an individual citizen." Morrissey v. Brewer, 408 U.S. 471, 478, 92 S. Ct. 2593, 33 L. Ed. 2d 484 (1972). A state may closely supervise parolees and impinge on their privacy rights to a greater extent than on the rights of the general public because administration of the parole system is within the state's "special needs" to ensure that the parolee observes the conditions of parole. Griffin, 483 U.S. at 873, 107 S. Ct. 3164. Parolees retain some Fourth Amendment safeguards, id. at 874, 107 S. Ct. 3164, but are not entitled to the full panoply of rights and protections possessed by the general public.

The touchstone of the Fourth Amendment is reasonableness. Aside from that well-settled principle, though, the law concerning what level of suspicion officers had to have before conducting a parole search — if any — was in "disarray" when appellees searched Motley's apartment. United States v. Conway, 122 F.3d 841, 843 (9th Cir.1997) (Wallace, J., concurring) ("Our precedent on the Fourth Amendment standards governing state probation searches is in considerable disarray.").9

It is useful to begin our analysis with the Supreme Court's 1987 decision in Griffin, where it held that a state may provide by law for searches of parolees and their property, including their homes, on less than probable cause. The Court upheld a Wisconsin regulation that subjected parolees to searches upon "reasonable grounds" to suspect the presence of contraband. See 483 U.S. at 872, 107 S. Ct. 3164. In upholding that regulation, however, the Court did not specify the lower bounds of its holding. For instance, the Court did not decide whether a state law may provide for searches of parolees at any time, for any or no reason.

Since Griffin, the Supreme Court has twice addressed the constitutional limitations on parole-related searches, but neither case answers the precise question before us. In Pennsylvania Board of Probation and Parole v. Scott, 524 U.S. 357, 369, 118 S. Ct. 2014, 141 L. Ed. 2d 344 (1998), the Court held that parole boards are not required by federal law to exclude evidence obtained in violation of the Fourth Amendment. The Court expressly declined to rule on the question of whether a search of a parolee's residence must be based on reasonable suspicion where the parolee has consented to searches as a condition of parole. Id. at 362 n. 3, 118 S. Ct. 2014. Three years later, the Court picked up where it left off, holding that "no more than reasonable suspicion" of a probation violation is required to conduct a search of a probationer's residence. United States v. Knights, 534 U.S. 112, 121, 122 S. Ct. 587, 151 L. Ed. 2d 497 (2001) (emphasis added) ("When an officer has reasonable suspicion that a probationer subject to a search condition is engaged in criminal activity, there is enough likelihood that criminal conduct is occurring that an intrusion on the probationer's significantly diminished privacy interests is reasonable."). The Court in Knights determined that the search at issue was supported by reasonable suspicion, but again expressly left open the precise question before us: Is a parolee's expectation of privacy so diminished that a search without any particularized suspicion is reasonable? Id. at 120 n. 6, 122 S. Ct. 587. This alone strongly suggests that the issue was not clearly established in March 1999, nearly two years before the Court issued its opinion in Knights. See United States v. Kincade, 379 F.3d 813, 830 (9th Cir.2004) (en banc) ("The only rational interpretation of Knights's express reservation is that ... it remains entirely an open question whether suspicionless searches of conditional releasees pass constitutional muster when such searches are conducted for law enforcement purposes."), cert. denied, ___ U.S. ___, 125 S. Ct. 1638, 161 L. Ed. 2d 483 (2005).

Of course, the lack of a Supreme Court decision does not prevent a finding that a right is clearly established. Naturally, our decisions relating to the legality of searches of probationers and parolees are binding on law enforcement officers in this circuit. But our caselaw provides no clearer a picture of what was constitutionally required when the officers searched Motley's apartment. Before that search, some of our cases suggested that if officers conducted a parole search in accordance with state law, it would pass constitutional muster. See United States v. Garcia-Cruz, 978 F.2d 537, 541 (9th Cir.1992) ("A parole search is proper if conducted in a manner consistent with state law."). For example, in United States v. Johnson, 722 F.2d 525, 527 (9th Cir.1983), we held that the validity of a state probation condition permitting searches "upon any reasonable request of a law enforcement officer" was governed by California law. See id. ("First, we look to whether the search condition itself was valid under California law. Second, we examine whether under the circumstances of this case the search condition was correctly applied."). While we required that there "`be some conduct reasonably suggestive of criminal activity to "trigger" the search,'" we cited California law for that rule. Id. at 527 (quoting People v. Guerrero, 85 Cal. App. 3d 572, 149 Cal. Rptr. 555, 560 (1978)). Indeed, in evaluating the reasonableness of the search in Johnson, our only reliance on federal law was our condemnation of the "practice of using one person's search condition as a pretext for conducting a general search unrelated to the acts of the probationer." Id. at 528.

Next, in United States v. Wryn, 952 F.2d 1122, 1124 (9th Cir.1991), we held that "had the warrantless search of the probationer Wryn's home been authorized by either Montana state law or by Wryn's probation agreement we would consider the search `reasonable' under the fourth amendment." Wryn involved a state law that required "reasonable cause as may be ascertained by a probation/parole officer" before conducting a search. Id. at 1124 n. 1. We did not indicate in any way, however, that Montana's "reasonable cause" requirement ensured that its law authorizing probation searches did not itself violate the Fourth Amendment.

In United States v. Watts, 67 F.3d 790 (9th Cir.1995), we again tied the constitutionality of probation searches to compliance with state law. We said that "[b]ecause a state's operation of its probation system presents `special needs' beyond normal law enforcement which render impracticable the Fourth Amendment's usual warrant and probable cause requirements, probation searches conducted pursuant to state law satisfy the Fourth Amendment's reasonableness requirement." Id. at 793 (citing Griffin, 483 U.S. at 872-80, 107 S. Ct. 3164). As in Wryn, the relevant state law at the time required reasonable suspicion of criminal activity before conducting a parole search, see People v. Burgener, 41 Cal. 3d 505, 224 Cal. Rptr. 112, 714 P.2d 1251, 1269-71 (1986),10 and that standard was satisfied. See Watts, 67 F.3d at 794 (officer conducting search "suspected that Watts ... had returned to the business of selling drugs"). Thus, we had no occasion to decide whether a state law that did not require such suspicion violates the Fourth Amendment.

Two years later, we appeared to clarify what we meant when we previously referred to state law in the context of parole searches. In Conway, we said that"[a] probation search is permissible if conducted pursuant to a state law that satisfies the Fourth Amendment's reasonableness standard." 122 F.3d at 842 (emphasis added). We ultimately upheld the search in Conway because it satisfied a state statute authorizing parolee searches upon "reasonable cause to believe that an offender has violated a condition or requirement of the sentence." Id. (internal quotation marks omitted). If we achieved clarity in Conway, it did not last long.

In the same year we decided Conway, we embraced our earlier condemnation of using a parolee's search condition as a pretext for other law enforcement investigations and declared that "we have long recognized that the legality of a warrantless search depends upon a showing that the search was a true probation search and not an investigation search." United States v. Ooley, 116 F.3d 370, 372 (9th Cir.1997) (search cannot be a "mere `subterfuge' enabling the police to avoid having to obtain a search warrant"). Adding to the confusion, we said nothing of a reasonable suspicion of wrong-doing on the probationer's part. Although in Knights the Supreme Court ultimately rejected Ooley's and Johnson's focus on the underlying purpose of the search, see United States v. Stokes, 292 F.3d 964, 967 (9th Cir.2002) ("Knights overturned a ruling of this court invalidating a search of a probationer on the ground that the search was not for probationary purposes, but was a mere subterfuge for a criminal investigation."), that occurred after the search at issue here, see Osolinski v. Kane, 92 F.3d 934, 936 (9th Cir.1996) ("Generally, courts do not look to post-incident cases to determine whether the law was clearly established at the time of the incident.").

Against that backdrop, we simply cannot say that the contours of when officers could conduct parole-related searches was "sufficiently clear" so that appellees understood that their warrantless and suspicionless search of Motley's apartment violated her rights. See Sorrels v. McKee, 290 F.3d 965, 970 (9th Cir.2002) (phrasing test as, "[s]urveying the legal landscape as it existed in 1997 and 1998, were the contours of the right sufficiently clear that a reasonable official would understand that what he was doing violated that right?" (internal quotation marks and brackets omitted)).11 Around six months before the search of Motley's apartment, California law changed dramatically and sanctioned a suspicionless search of a parolee's residence. See People v. Reyes, 19 Cal. 4th 743, 80 Cal. Rptr. 2d 734, 968 P.2d 445, 451 (1998) (overruling earlier decision and concluding that "particularized suspicion is not required in order to conduct a search based on a properly imposed search condition" (emphasis added)). Appellees reasonably could have believed that, under our prior caselaw, the constitutionality of the search condition in Jamerson's parole agreement — which did not require any suspicion of wrong-doing — depended in significant part on compliance with California law. Indeed, given our decisions in Ooley and Johnson, appellees reasonably could have viewed federal law as prohibiting only those searches that are done as a pretext for police investigations unrelated to the parolee. Although we now know that the latter belief was wrong in light of Knights, and the Supreme Court in Samson may tell us the former was too, that could not have been predicted in March 1999.

Motley cites two other cases to support her argument that we have "long required officers to have reasonable suspicion linking the parolee to some wrongdoing," but neither comes close to meeting the "clearly established" threshold. In United States v. Davis, 932 F.2d 752, 758 (9th Cir.1991), we noted that "[t]he permissible bounds of a probation search are governed by a reasonable suspicion standard." The question before us, though, was whether a safe inside the probationer's residence was a reasonable extension of the search condition in his probation agreement. We ultimately held that the "police must have reasonable suspicion, that an item to be searched is owned, controlled, or possessed by probationer, in order for the item to fall within the permissible bounds of a probation search." Id. Thus, viewed in its proper context, the Davis holding has little to do with our requiring a particularized suspicion of wrong-doing. It merely reflects our requirement — set forth earlier in this opinion — that officers have probable cause to believe that what they intend to search actually belongs, or is connected, to the parolee.

United States v. Dally is at best ambiguous on the issue. There we said that a parolee "may be searched, pursuant to a consent provision in his parole terms, if his parole officer reasonably believes a search is appropriate." 606 F.2d at 863. The parole agreement required Dally to obtain permission before changing residences and consent to searches "of his residence by his Parole Agent, any agent of the Department of Corrections, or any law enforcement officer." Id. at 862 (internal quotation marks omitted). We held that the parole officer's search was "authorized by California law" where the parolee failed to return calls and the officer learned that the parolee had another residence. Id. at 863. We did not, however, clarify whether we did so because the officer had a reasonable belief as to the parolee's new residence or because the parolee had violated the terms of his parole agreement by moving without permission.

Finally, we find it necessary to address Moreno v. Baca, 431 F.3d 633 (9th Cir.2005) (as amended), decided earlier this year by a three-judge panel of our court. Moreno alleged that in January 2000, for essentially no reason whatsoever, while he was merely walking down the street, officers stopped, detained, and searched him. It was not until afterward that officers learned that Moreno was on parole. The officers sought to justify their actions retroactively on the ground that, as a parolee, Moreno was subject to search at will. Accordingly, the issue before the Moreno panel was whether officers must be aware of a parole condition before conducting a parole search. The panel's holding concludes that

[b]ecause the Deputies did not know of Moreno's parole status... at the time they searched and seized him, th[is] circumstance[] cannot justify their conduct. At the time of the incident in this case, it was clearly established that the facts upon which the reasonableness of a search or seizure depends, whether it be an outstanding arrest warrant, a parole condition, or any other fact, must be known to the officer at the time the search or seizure is conducted.

Id. at 642 (citations omitted).

We agree with the Moreno court to the extent that it determined that the officers must be aware that the individual is on parole before conducting a parole search. See, e.g., United States v. Luckett, 484 F.2d 89, 90-91 (9th Cir.1973) (per curiam). However, Moreno could be read as a declaration that it has long been the law of this circuit that law enforcement officers must have reasonable suspicion of wrongdoing to justify a parole search. Whether or not that reading goes beyond the issue presented in Moreno, we reject it. We are squarely confronted with the issue in this case and hold that it was not clearly established at the time the officers searched Motley's apartment.

In summary, the officers are entitled to qualified immunity for their search of Motley's apartment because, first, they had probable cause to believe that parolee Jamerson was living there; and second, it was not clearly established that a particularized suspicion of wrong doing on Jamerson's part was required as a prerequisite to the search of his residence. Accordingly, as respects the search, summary judgment in favor of the officers was properly granted.

Motley alleges that during the search of her apartment, Kading pointed a firearm at five-week-old Juan Jamerson, who was lying on the bed in Motley's bedroom, and kept the firearm trained on the infant while he searched the room. The district court concluded that Kading was entitled to qualified immunity with respect to this claim. We reverse and remand.

Claims that law enforcement officers have used excessive force in the course of an arrest, investigatory stop, or other seizure12 "are properly analyzed under the Fourth Amendment's `objective reasonableness' standard." Graham, 490 U.S. at 388, 109 S. Ct. 1865. The use of a force against a person who is helpless or has been subdued is constitutionally prohibited. Robinson, 278 F.3d at 1014-15 (holding that officers' use of firearms at close range, pointed at unarmed misdemeanor suspect's head, was excessive force); see also Drummond v. City of Anaheim, 343 F.3d 1052, 1057-58 (9th Cir.2003) (holding that officers' alleged act of prolonged pressure onto detainee's prone body as he lay on the ground handcuffed and gasping for air constituted excessive force), cert. denied, 542 U.S. 918, 124 S. Ct. 2871, 159 L. Ed. 2d 775 (2004); Headwaters Forest Def. v. County of Humboldt, 276 F.3d 1125, 1130 (9th Cir.2002) (holding that repeated use of pepper spray against nonviolent protestors under police control rose to the level of excessive force).

An officer's show of force is subject to Fourth Amendment reasonableness requirements even where no actual force is applied. See Robinson, 278 F.3d at 1014-15 (indicating agreement with the Fifth Circuit that "`[a] police officer who terrorizes a civilian by brandishing a cocked gun in front of that civilian's face may not cause physical injury, but he has certainly laid the building blocks for a section 1983 claim against him.'" (quoting Petta v. Rivera, 143 F.3d 895, 905 (5th Cir.1998) (per curiam))). The Seventh Circuit has also reached this conclusion. In McDonald v. Haskins, 966 F.2d 292 (7th Cir.1992), the court held that

It should have been obvious to [the officer] that his threat of deadly force — holding a gun to the head of a 9-year-old and threatening to pull the trigger — was objectively unreasonable given the alleged absence of any danger to [the officer] or other officers at the scene and the fact that the victim, a child, was neither a suspect nor attempting to evade the officers or posing any other threat.

Id. at 295.

In this case, as in McDonald, none of the factors justifying the use of force toward Juan exists. While it may have been reasonable for Kading to have drawn his firearm during the initial sweep of a known gang member's house, his keeping the weapon trained on the infant, as he was alleged to have done, falls outside the Fourth Amendment's objective reasonableness standard. Motley has stated a constitutional violation.

Having determined that Motley's factual allegations, if true, establish a constitutional violation, we turn our attention to evaluating whether the law was clearly established such that a reasonable officer would have known that the conduct was unlawful. To be clearly established for qualified immunity purposes, the contours of the asserted right must be "sufficiently clear that a reasonable official would understand that what he is doing violates that right." Camarillo v. McCarthy, 998 F.2d 638, 640 (9th Cir.1993) (internal quotation marks omitted). "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." Anderson v. Creighton, 483 U.S. 635, 640, 107 S. Ct. 3034, 97 L. Ed. 2d 523 (1987) (citation omitted); McDonald, 966 F.2d at 295 (recognizing that the qualified immunity defense will not succeed merely because the alleged behavior is so egregious that no previous case has found liability under those circumstances).

Viewing the evidence in the light most favorable to Motley, the conduct engaged in by Officer Kading was objectively unreasonable given the absence of danger posed by Juan to Kading or any of the other officers at the scene. The use of any force was unwarranted under these circumstances. Any reasonable officer should have known that holding an infant at gunpoint constituted excessive force. "Although there is no prior case prohibiting the use of this specific type of force in precisely the circumstances here involved, that is insufficient to entitle [Officer Kading] to qualified immunity: notwithstanding the absence of direct precedent, the law may be, as it was here, clearly established." Deorle v. Rutherford, 272 F.3d 1272, 1275 (9th Cir.2001). We reverse the district court's grant of summary judgment in favor of Officer Kading on the excessive force claim and remand to the district court for further proceedings.

We agree with the district court that Motley has not presented sufficient evidence to establish liability pursuant to Monell v. Department of Social Services, 436 U.S. 658, 98 S. Ct. 2018, 56 L. Ed. 2d 611 (1978). Accordingly, we affirm the dismissal of her claims against former LAPD police chiefs Parks and Gates.

We affirm the district court's grant of summary judgment in favor of the officers as respects the search. We also affirm the district court's summary judgment in favor of the city officials as to the Monell claims. We reverse the court's grant of qualified immunity to Officer Kading concerning the excessive force claim and remand for further proceedings.

AFFIRMED in part; REVERSED in part. The parties shall bear their own costs on appeal.

REINHARDT, Circuit Judge, with whom BETTY B. FLETCHER, PREGERSON and PAEZ, Circuit Judges, join, dissenting.1

I agree with the majority that because the Supreme Court has granted certiorari in a case that will likely resolve a question that we have consistently avoided — whether reasonable suspicion is required for the search of the home of a probationer or parolee who has executed a standard consent form as a condition of his probation or parole — we are justified in proceeding directly to the second prong of the Saucier test. I also agree for similar reasons that the pertinent law is not clearly established and, thus, that qualified immunity applies with respect to the search of a probationer's or parolee's residence without reasonable suspicion. I further agree that probable cause to believe that a probationer or parolee lives in a particular place is required in order to search that location. Thus, my disagreement with the majority opinion is narrow. I disagree only with respect to the holding that probable cause existed for the officers to believe that Jamerson lived in Motley's home. Contrary to the majority, I would hold that the officers did not have probable cause to believe that Jamerson currently resided there and would therefore reverse the district court's determination that Officers Ruegg, Kading, Sanchez, and Black were entitled to qualified immunity.

As the majority notes, the information regarding Jamerson's residence could have been collected at any point between November 1998, when the task force began gathering such information, and March 1999, when the LAPD briefing was conducted. Because Officer Ruegg assigned the task of gathering and confirming parolee information to another officer, he stated at his deposition that he had no way of knowing at what point during that period the information regarding Jamerson had been obtained. Also at his deposition, Ruegg acknowledged his awareness that "sometimes parolees didn't live where police thought they lived" and stated that he could not personally confirm the accuracy of any of the parolee data. Instead, Ruegg testified that it was the responsibility of the searching officers to verify such information before going to a parolee's residence. Given Ruegg's position and his knowledge that the information regarding Jamerson's residence could well be stale, it was not reasonable for him to fail to verify it through the use of any of several available methods. See Ramirez v. Butte-Silver Bow County, 298 F.3d 1022, 1027 (9th Cir.2002), aff'd by Groh v. Ramirez, 540 U.S. 551, 124 S. Ct. 1284, 157 L. Ed. 2d 1068 (2004). As the supervisor of the search team, Ruegg is liable under § 1983 for the failure to verify and is not entitled to qualified immunity. See Larez v. City of Los Angeles, 946 F.2d 630, 646 (9th Cir.1991).

Similarly, probable cause was lacking for the searching officers to believe that Jamerson was currently residing with Motley. At the March 18, 1999 LAPD briefing, the searching officers were provided with Jamerson's last known address and Jamerson's parole status, but they were not informed how current or stale that information was. When they arrived at Motley's residence, Motley told them that Jamerson did not currently reside there and that he was being held in custody. Instead of calling Jamerson's parole officer to ascertain whether it was true that Jamerson was currently in custody, or otherwise attempting to confirm such information, the officers lied, asserting falsely that Jamerson had been released, that Jamerson's parole officer was accompanying them on the search, and that they had a warrant to search the premises.

Even after the officers communicated those deliberate falsehoods to Motley, she emphatically repeated that Jamerson did not currently reside at her home and was being held in custody. At this point, the officers had a clear duty to confirm Jamerson's custody and residence status.

Although officers may reasonably "rely on information obtained from fellow law enforcement officers, ... this in no way negates a police officer's duty to reasonably inquire or investigate these reported facts." Mendocino Envtl. Ctr. v. Mendocino County, 192 F.3d 1283, 1293 n. 16 (9th Cir.1999) (citation omitted). Moreover, "[i]t is incumbent on the officer executing a search warrant to ensure the search is lawfully authorized and lawfully conducted." Groh, 540 U.S. at 563, 124 S. Ct. 1284. The searching officers in the instant case did not have a search warrant, but, as confirmed by their supervising officer, nevertheless had a duty to ensure that the information they possessed was correct. Of critical importance is the fact that the officers had not been advised by their supervisor how current or stale was the information regarding Jamerson's residence. Thus, Motley's repeated insistence that Jamerson was currently in custody, i.e. not currently in residence, was in no manner inconsistent with the specific information they possessed. Nevertheless, the officers made no attempt to verify Jamerson's current residence, even though they presumably could easily have done so by making a quick phone call to Jamerson's parole officer.2 Furthermore, the officers' deliberate falsehoods strongly suggest that they did not have a reasonable belief that Jamerson was still a resident and that they sought to obviate the necessity for a further inquiry by gaining entry through threats and deceit. All in all, Officers Kading, Sanchez, and Black did not have probable cause to believe that Jamerson currently resided in Motley's home,3 and, like Ruegg, are not entitled to qualified immunity.4 Accordingly, I dissent.