F I L E D
                                                                  United States Court of Appeals
                                                                          Tenth Circuit
                   UNITED STATES COURT OF APPEALS
                                                                         AUG 16 2004
                               TENTH CIRCUIT
                                                                      PATRICK FISHER
                                                                               Clerk

 UNITED STATES OF AMERICA,

                 Plaintiff-Appellant,
 v.                                                     No. 04-2036
 MARTIN PINA-ABOITE,                                 (D. New Mexico)
 RAUL DEL ROSARIO SEPULVEDA,
                                                   (D.C. No. 03-1097 JC)
                 Defendants-Appellees.




                          ORDER AND JUDGMENT *


Before HENRY , LUCERO , Circuit Judges, and      FIGA , ** District Judge.


      Defendants-appellees Martin Pina-Aboite and Raul Del Rosario Sepulveda

were stopped on the highway by a New Mexico police officer for what appeared

to be an expired vehicle tag. Although the officer discovered that the tag was

valid, he continued to question the defendants and obtained their consent to

search the vehicle. The search uncovered eleven pounds of crystal


      *
        This order and judgment is not binding precedent, except under the
doctrines of law of the case, res judicata, and collateral estoppel. The court
generally disfavors the citation of orders and judgments; nevertheless, an order
and judgment may be cited under the terms and conditions of 10 TH C IR . R. 36.3.
      **
          The Honorable Philip S. Figa, United States District Judge for the
District of Colorado, sitting by designation.
methamphetamine hidden in the gas tank. The defendants were indicted for

conspiracy to possess and possession with intent to distribute over 500 grams of

methamphetamine, in violation of 21 U.S.C. §§ 846, 841(a)(1), 841(b)(1)(A), and

18 U.S.C. § 2. Following a hearing on September 22, 2003, the district court

granted the defendants’ motion to suppress evidence obtained following the stop

of their vehicle. On November 17, 2003, the district court granted the

government’s motion for reconsideration and denied defendants’ motion to

suppress. On March 11, 2004, the district court granted defendants’ motion for

reconsideration and once again granted their motion to suppress.

      We hold that the police officer had no justification for detaining the

defendants after the original purpose of the traffic stop was met and that the

detention violated the defendants’ Fourth Amendment rights. Moreover, we hold

that the consent to search was not sufficient to purge the taint of the illegal

detention. Accordingly, we affirm the district court’s grant of the defendants’

motion to suppress.



                                  BACKGROUND

      On May 21, 2003, New Mexico Police Officer Nick Ramos was patrolling

Interstate 25 north of Santa Fe and observed the defendants in a Nissan Maxima

bearing a Nebraska license plate displaying the number “02.” Believing that the


                                           2
vehicle tag had expired, Officer Ramos pulled the defendants over. The camera

mounted to the dashboard of Officer Ramos’ police car recorded the traffic stop.

The audio recording did not pick up all of the conversation because at times the

audio signal was not received from Officer Ramos’ body microphone. Much of

the conversation transpired in Spanish, and a translator prepared a transcription of

the audible portions of the tape. Officer Ramos does not speak fluent Spanish,

which led to some confusion in his communications with the defendants.

      As Officer Ramos walked by the rear of the car, he looked at the license

plate, and he still saw only the “02” on the sticker. Officer Ramos approached the

passenger side window and asked the driver, Mr. Pina-Aboite, for his license and

the registration and insurance papers. Mr. Pina-Aboite handed the officer each

document separately. As Mr. Pina-Aboite handed the documents to Officer

Ramos, he told him that the car belonged to Mr. Sepulveda. Officer Ramos asked

for Mr. Sepulveda’s identification, which Mr. Sepulveda handed to him.

      Officer Ramos testified that as the defendants handed over their documents,

Mr. Pina-Aboite’s hand was shaking, Mr. Sepulveda refused to make eye contact,

and the defendants’ chests were moving in an “exaggerated and definitive”

manner. Aplt’s App. at 40 (Tr. of Hr’g on Motion to Suppress, Sept. 17, 2003).

Officer Ramos. He testified that this behavior aroused his suspicions because

they indicated “very, very strong nervousness.” 

                                          3
      Officer Ramos asked Mr. Pina-Aboite to get out of the car and walk to the

rear. Mr. Pina-Aboite did so, and Officer Ramos explained why he had stopped

the car. Mr. Pina-Aboite approached the Nissan’s license plate and explained that

the “02” sticker indicated the month February, not the year 2002. The officer

examined the license plate and identified the year “2004” in smaller lettering

alongside the “02.” At that point, Officer Ramos was satisfied that there was no

traffic infraction. He later testified that he “wouldn’t have bothered” to stop the

car had he seen that the sticker on the plate read “2004.” Aplt’s App. at 97.

      However, Officer Ramos continued to talk to Mr. Pina-Aboite and to retain

the documents that the defendants had given him. Officer Ramos testified that he

did so because “there were a lot of things that, based on [his] training and

experience, just wasn’t [sic] right.” 

Officer Ramos cited “the totality

of the circumstances” for his suspicions, including “everything that was said; the

mannerisms; the very, very strong nervousness presented by not just the driver,

but the passenger; and his actions towards me; . . . [and the fact that] the driver

had identified that the vehicle belonged to the passenger, and he was present in

the vehicle.” 

Officer Ramos also felt that he needed to complete his

review of the driver’s license, registration, and insurance information.

      Officer Ramos asked Mr. Pina-Aboite to step to the side of the police car

and questioned him about where he was coming from and where he was going.


                                           4
Mr. Pina-Aboite responded that he and Mr. Sepulveda were coming “[f]rom

Sinaloa, [Mexico,] . . . when we went we left the car in Phoenix, Arizona, and

now we are going to Nebraska.” Aplt’s App. at 183 (Tr. of Videotaped Traffic

Stop). Officer Ramos then asked how long they had been in Phoenix, and Mr.

Pina-Aboite responded, “No, I was not in Phoenix.” 

testified

that he found these statements to be contradictory. Officer Ramos next asked

what the defendants were doing in Mexico and how long they were there. Mr.

Pina-Aboite replied that they were visiting for Mother’s Day and that they had

been there for two months. Officer Ramos asked to whom the car belonged, and

Mr. Pina-Aboite again told him that it belonged to his brother, Mr. Sepulveda.

      Officer Ramos then told Mr. Pina-Aboite to wait by the police car while he

checked the VIN on the car against the registration papers. He approached the

Nissan and viewed the VIN on the dashboard through the windshield. He found

the numbers matched and found no evidence that the VIN plate had been altered.

He then opened the driver’s side door to view the VIN plate on the inside of the

door. Mr. Sepulveda was still sitting in the front passenger seat. Officer Ramos

told him why he had stopped the car and that he was checking the VIN. Officer

Ramos then asked Mr. Sepulveda about where he had been, and Mr. Sepulveda

replied that they had been in Mexico on an emergency because his mother had

been ill. Officer Ramos testified that in part of the conversation not recorded on


                                         5
his microphone, Mr. Sepulveda said they had been in Mexico for ten days, and

that they had dropped the car off in Phoenix and taken a bus to Sinaloa.

      Officer Ramos returned to Mr. Pina-Aboite and asked him again about the

length and reason for the trip to Mexico. Mr. Pina-Aboite reaffirmed his story

that they had been there for two months for Mother’s Day. Officer Ramos

testified that at this point his suspicions were heightened by the discrepancies in

the two defendants’ stories about their travels. He also found suspicious the

claim that the two were brothers, because he could find no common last name in

their identification documents.

      Nevertheless, Officer Ramos returned all of the identification documents to

Mr. Pina-Aboite and thanked him. As Mr. Pina-Aboite started back toward the

Nissan, Officer Ramos called after him in Spanish, “¿Sabes que?” or “You know

what?” and then said “Um, this car?” Aplt’s App. at 186. Mr. Pina-Aboite turned

and walked back to Officer Ramos, asking whether he needed to change his

license plate. Officer Ramos replied that he did not, then asked him several

questions about where and how they had crossed the border. The officer asked

whether they were carrying much money, or any drugs or weapons, and Mr. Pina-

Aboite answered no each time. Officer Ramos then asked, “[M]ay I search?” and

Mr. Pina-Aboite agreed. 

Mr. Pina-Aboite gave consent to search

approximately two minutes after Officer Ramos returned the documents to him.


                                          6
Officer Ramos did not inform Mr. Pina-Aboite that he had the right to refuse

consent.

      Around the time Mr. Pina-Aboite agreed orally to the search, another

officer arrived with a drug-sniffing dog. Officer Ramos approached Mr.

Sepulveda and again asked him about the reason for their trip and asked him

whether they were carrying various forms of contraband. Mr. Sepulveda replied

no to each question; the officer then asked him for permission to search, and Mr.

Sepulveda agreed. Officer Ramos did not inform Mr. Sepulveda that he had the

right to refuse consent. Officer Ramos asked Mr. Sepulveda to step out of the car

and to stand on a nearby grassy bank, separated from Mr. Pina-Aboite.

      Officer Ramos gave each defendant a consent form, which was written in

Spanish and English, and which each defendant signed. The forms advised of the

right to refuse consent. Officer Ramos did not read the forms to the defendants,

nor ask if they understood them.

      Officer Ramos then asked each defendant if he could use the dog to search

the car, telling them that the search would go faster that way, and each assented.

The search of the car uncovered eleven pounds of crystal methamphetamine in the

gas tank. After being advised of their Miranda rights, both defendants said they

had put the drugs in the gas tank.

      Mr. Pina-Aboite and Mr. Sepulveda were indicted for conspiracy to possess


                                          7
and possession with intent to distribute over 500 grams of methamphetamine, in

violation of 21 U.S.C. §§ 846, 841(a)(1), and 841(b)(1)(A). Following a hearing

on September 22, 2003, the district court granted defendants’ motion to suppress

evidence. On November 17, 2003, the district court granted the government’s

motion for reconsideration and denied defendants’ motion to suppress. On March

11, 2004, the district court granted defendants’ motion for reconsideration and

again granted their motion to suppress. In this second order to suppress, the

district court found (1) the initial stop was valid based on Officer Ramos’ belief

that the license plate had expired; (2) “[c]ontinued detention of the Defendants

without reasonable suspicion after Officer Ramos determined the license plate

was current was in violation of Defendants’ Fourth Amendment protections”; and

(3) “[t]he government failed to meet its burden to show that a subsequent,

voluntary consent by Defendants purged the taint of such violation.” Aplt’s App.

at 212 (Order, dated Mar. 11, 2004). The government’s appeal followed.

      Below we discuss the government’s arguments that (A) Officer Ramos’

detention of the defendants did not violate their Fourth Amendment rights

because (1) Officer Ramos was justified in completing his review of the

defendants’ driver’s licenses, registration, and insurance; and (2) Officer Ramos

had developed reasonable suspicion based on the defendants’ nervousness and Mr.

Sepulveda’s avoidance of eye contact. In the alternative, the government argues


                                          8
that (B) even if at some point the detention became illegal, when Officer Ramos

returned the identification documents to Mr. Pina-Aboite, the traffic detention

ended, and the illegal detention “transformed into a consensual encounter, which

was an intervening event freeing the subsequent consent to search from any

illegality.” Aplt’s Br. at 28.



                                   Standard of Review

      “When reviewing an order granting or denying a motion to suppress, we

accept the district court’s factual findings unless they are clearly erroneous, and

we view the evidence in the light most favorable to the district court’s

determination.” United States v. Caro, 

, 1243 (10th Cir. 2001).

“[A]t a hearing on a motion to suppress, the credibility of the witnesses and the

weight given to the evidence, as well as the inferences and conclusions drawn

therefrom, are matters for the trial judge.” United States v. Fernandez, 

, 876 (10th Cir. 1994). “However, the ultimate determination of

reasonableness under the Fourth Amendment is a question of law which we

review de novo.” 

.



                                 A. Legality of Detention

      The Fourth Amendment protects individuals from “unreasonable searches


                                            9
and seizures.” U.S. C ONST . amend. IV. “A traffic stop is a ‘seizure’ within the

meaning of the Fourth Amendment, even though the purpose of the stop is limited

and the resulting detention quite brief.” United States v. Holt, 

,

1220 (10th Cir. 2001) (en banc) (internal quotation marks omitted). “A routine

traffic stop is analogous to an investigative detention and is analyzed under the

principles stated in Terry v. Ohio, 

(1968).” 

.

      “To determine the reasonableness of an investigative detention, we make a

dual inquiry. First, we ask whether the officer’s action was justified at its

inception, and second, whether it was reasonably related in scope to the

circumstances which justified the interference in the first place.” 

marks omitted). “Thus, we assess the reasonableness of a traffic stop

based on an observed violation by considering the scope of the officer’s actions

and balancing the motorist’s legitimate expectation of privacy against the

government’s law-enforcement-related interests.” 

.

1.    Regulatory Purpose of Traffic Stops

      It is undisputed that the initial stop of the defendants’ car was justified by

Officer Ramos’ reasonable articulable suspicion that the Nissan’s license plate

had expired. Although this suspicion was dispelled almost immediately, the

government argues that Officer Ramos’ detention of the defendants was lawful

without further reasonable suspicion because “[o]nce a lawful traffic stop has


                                         10
been made, and the officer has routinely requested license, registration, and

insurance information, his investigation of the occupants’ identity and the

vehicle’s ownership serves a proper regulatory purpose that is independent of the

traffic-infraction violation.” Aplt’s Br. at 20 (relying on Delaware v. Prouse, 

, 658 (1979) (acknowledging the States’ “vital interest in ensuring that

only those qualified to do so are permitted to operate motor vehicles, that these

vehicles are fit for safe operation, and hence that licensing, registration, and

vehicle inspection requirements are being observed”)). The government would

have us hold that so long as “there is a reasonable-suspicion justification for the

detention at the time the officer begins his regulatory check of license and

registration information,” he is entitled to further detain a driver to complete his

review of the documents – even if his reasonable suspicion is immediately

dispelled. 

      As a preliminary matter, we note that the government’s argument was not

adequately raised before the district court. The government concedes that it “did

not initiate the argument that the continuation of the stop was justified by a

regulatory purpose,” but contends that it may defend the district court’s ruling on

the government’s motion for reconsideration that Officer Ramos had not

completed his review of the defendants’ information at the time he determined no

traffic violation had occurred. Aplt’s Reply Br. at 2 n.1 (citing Aplt’s App. at


                                          11
174-76). Because “[i]t is within our discretion to decide on a case-by-case basis

which questions to address for the first time on appeal,” Thompson v. United

States, 

, 1211 (10th Cir. 2000), we will reach the issue.

      During a typical traffic stop, an officer “may request a driver’s license and

vehicle registration, run a computer check, and issue a citation.” 

. Also, “questions relating to a driver’s travel plans ordinarily fall within

the scope of a traffic stop.” United States v. Williams, 

, 1267 (10th

Cir. 2001). While an “officer may detain the driver and his vehicle as long as

reasonably necessary to make these determinations and to issue a citation or

warning,” United States v. Wood, 

, 945 (10th Cir. 1997), “[t]he

scope of the detention must be carefully tailored to its underlying justification.”

Florida v. Royer, 

, 500 (1983).

      [A]n investigative detention must be temporary and last no longer than
      is necessary to effectuate the purpose of the stop. Similarly, the
      investigative methods employed should be the least intrusive means
      reasonably available to verify or dispel the officer’s suspicion in a short
      period of time.

ordinarily expect to be allowed to continue on their way once

the purposes of a stop are met.” 

.



      The cases relied upon by the government permitting a prolonged detention

for regulatory checks of identification documents and questioning about travel


                                          12
plans are distinguishable from the instant case because they all involved traffic

stops in which citations were actually warranted, such that the regulatory checks

and questions were at all times supported by reasonable suspicion. See 

(defendant clocked exceeding the speed limit); United States

v. West, 

, 1174 (10th Cir. 2000) (same); 

(same); United States v. Rivera, 

, 1262 (10th Cir. 1989) (defendant

observed tailgating). In this case, however, Officer Ramos’ suspicion that a

traffic violation had occurred was dispelled almost immediately after he stopped

the defendants and he observed that the vehicle’s license plate was current.

Nevertheless, Officer Ramos prolonged the detention, retaining the defendants

identification documents for several minutes, questioning the defendants

extensively, and checking the VIN on the car two separate times.

      In United States v. McSwain, 

(10th Cir. 1994), we held that

when an officer stopped the defendant for the sole purpose of ensuring the

validity of the vehicle’s registration sticker, and upon approaching the car

observed that the sticker was valid, “the purpose of the stop was satisfied. [The

officer’s] further detention of the vehicle to question [defendant] about his

vehicle and travel itinerary and to request his license and registration exceeded

the scope of the stop’s underlying justification.” 

The government

attempts to distinguish McSwain on the basis that Officer Ramos did not learn


                                         13
that the registration sticker was current until after he had requested the

defendants’ identification documents. This difference in timing is irrelevant

because when Officer Ramos’ suspicion regarding the validity of the license plate

was dispelled, the sole purpose of the stop was met, as in McSwain. He was not

justified in extending the scope of the detention, and he should have returned the

defendants’ documents and allowed them to continue on their way. See 

(recommending that “[a]s a matter of courtesy, the officer could

explain to drivers in [such] circumstances the reason for the initial detention and

then allow them to continue on their way”).

      In United States v. Valadez, 

(5th Cir. 2001), an officer

stopped a car that appeared to have an expired vehicle registration sticker on the

front windshield and illegal window tinting on other windows. After making

contact with the driver, the officer acknowledged that the sticker was valid but

that the window tint appeared to be illegal. Before retrieving a window-tint meter

from his patrol car, the officer asked the driver for his driver’s license and

insurance card, both of which appeared to be valid. When the officer returned to

his patrol car to get the window-tint meter, he requested a computer check of the

driver’s license, and the driver’s outstanding warrants and criminal history. While

the computer checks were in progress, the officer returned to the vehicle,

inspected the window tint, and determined that it was legal. However, the officer


                                          14
continued to detain and question the driver, who admitted that he was carrying

weapons in his car. When further inquiry revealed that the driver had a felony

record, he was charged with being a felon in possession of a weapon.

      However, the Fifth Circuit held that in the absence of reasonable suspicion

beyond that which led to the initial stop,

      [f]urther detention was not lawful after the point at which the purposes
      of the stop was resolved – that is, when Officer Slubar determined that
      Valadez had a proper inspection sticker and proper window tinting.
      There was then no further reason to detain Valadez, and all that
      followed thereafter contravened Valadez’s Fourth Amendment rights.
      Therefore, because the relevant period of lawful detention at issue
      expired, all evidence that followed, including Valadez’s responses to
      the questions, his guns, and his criminal record should be suppressed.

      Similarly, we hold that once Officer Ramos became aware that there was no

traffic violation, it was unreasonable and a violation of the Fourth Amendment to

extend the scope of the detention for the purpose of inspecting the defendants’

identification, registration, and insurance documents. Although Officer Ramos

defends his prolonged detention of the defendants based on their supposedly

inconsistent descriptions of their travel plans and his doubt of their claim to be

brothers, these statements were made after Officer Ramos determined that the

licence plate sticker was valid. Therefore, they were tainted by the unlawful

detention and cannot contribute to the reasonable suspicion inquiry. 

that as part of Officer Ramos’ regulatory investigation of the

                                             15
defendants’ identification documents, he checked the VIN plates on the vehicle

against the car’s registration two separate times, looking through the windshield

to examine the dashboard plate and opening the car door to view the plate on the

interior of the driver’s side door panel. This procedure contravenes our holding

in Caro that “where the dashboard VIN plate is readable from outside the

passenger compartment, that VIN matches the VIN listed on the registration, and

there are no signs the plate has been tampered with, there is insufficient cause for

an officer to extend the scope of a detention by entering a vehicle’s passenger

compartment for the purpose of further examining any 

.

It was during Officer Ramos’ check of the interior VIN that he questioned Mr.

Sepulveda about the defendants’ travel plans and became suspicious based on the

inconsistencies between his and Mr. Pina-Aboite’s stories. Under Caro, Mr.

Sepulveda’s statements would be suppressed as the fruit of an illegal search, and

so could not contribute to Officer Ramos’ reasonable suspicion of illegal activity.

2.    Reasonable Suspicion of Illegal Activity

      Although we have held that Officer Ramos was not justified in prolonging

the defendants’ detention for a regulatory purpose, it is permissible for an officer

to detain a driver for further questioning beyond that related to the traffic initial

stop “if he has an objectively reasonable and articulable suspicion illegal activity


                                          16
has occurred or is occurring.” United States v. Hunnicutt, 

, 1349

(10th Cir. 1998). “Reasonable suspicion is a minimal level of objective

justification which the officers can articulate, as distinct from an inchoate and

unparticularized suspicion or hunch.” United States v. Valles, 

, 680

(10th Cir. 2002) (internal quotation marks omitted). Reviewing courts making

reasonable-suspicion determinations “must look at the ‘totality of the

circumstances’ of each case to see whether the detaining officer has a

‘particularized and objective basis’ for suspecting legal wrongdoing.” United

States v. Arvizu, 

, 273 (2002).

      The government argues that at the time that Officer Ramos discovered that

the vehicle’s registration sticker was valid, he had an objectively reasonable and

articulable suspicion of illegal activity based on “the defendants’ excessive

nervousness” – which Officer Ramos deduced from their “shaking hands and

heavy breathing”– and Mr. Sepulveda’s avoidance of eye contact. Aplt’s Br. at

25; see United States v. Walker, 

, 817 n.3 (10th Cir. 1991) (“The

general term ‘nervousness’ encompasses an almost infinite variety of behaviors.

No doubt there are circumstances in which an individual’s nervous behavior

would give rise to a reasonable suspicion of criminal activity.”); United States v.

Chavez-Valenzuela, 

, 727 n.6 (9th Cir. 2001) (“[A]voidance of eye

contact is a common sign of nervousness.”).


                                          17
      The district court concluded that under the circumstances the defendants’

nervousness did not give rise to a reasonable articulable suspicion of illegal

activity. “We must accept this determination unless it is clearly erroneous.”

.

      “We have repeatedly held that nervousness is of limited significance in

determining reasonable suspicion and that the government’s repetitive reliance on

the nervousness of either the driver or passenger as a basis for reasonable

suspicion in all cases of this kind must be treated with caution.” 

(internal quotation marks omitted). “It is certainly not uncommon for

most citizens – whether innocent or guilty – to exhibit signs of nervousness when

confronted by a law enforcement officer.” 

. Thus, “courts

should discount the detaining officer’s reliance on the detainee’s nervousness.”

United States v. Johnson, 

, 1192 (10th Cir. 2004) (internal

quotation marks omitted); United States v. Salzano, 

, 1113 (10th

Cir. 1998) (“[A]bsent signs of nervousness beyond the norm, we will discount the

detaining officer’s reliance on the detainee’s nervousness as a basis for

reasonable suspicion.”).

      Using nervousness as a factor in establishing reasonable suspicion is

especially “troublesome” when there is a “complete lack of evidence in the record

that [the detaining officer] had any prior knowledge of [the defendants] to make


                                         18
an evaluation of their behavior.” 

(citing United States

v. Bloom, 

, 1458 (10th Cir.1992) (“Nothing in the record indicates

whether Agent Ochoa had any prior knowledge of Defendant, so we do not

understand how Agent Ochoa would know whether Defendant was acting nervous

and excited or whether he was merely acting in his normal manner. Rather,

Defendant’s appearance to Agent Ochoa is nothing more than an inchoate

suspicion or hunch.”) (internal quotation marks and citations omitted), overruled

in part on other grounds by United States v. Little, 

, 1504 n.5 (10th

Cir. 1994)); 

(noting that the officer “had no prior

acquaintance with Mr. Wood which enabled the trooper to contrast Mr. Wood’s

behavior during the traffic stop with his usual demeanor”). Officer Ramos’

conclusion that the defendants were exhibiting nervous behavior is a “subjective

evaluation” made without any prior knowledge of their usual demeanor, making it

less significant in formulating a reasonable suspicion. 

.

      “While nervousness may . . . appear as a factor in many traffic stop cases,

we have never held that by itself it creates a reasonable suspicion of criminal

activity.” 

; 

(“Nervousness

alone cannot support reasonable suspicion of criminal activity.”). As in

Fernandez, there is

      an important distinction between this case and our other cases in this
      area. More specifically, a defining characteristic of our traffic stop

                                         19
      jurisprudence is the defendant’s lack of a valid registration, license, bill
      of sale, or some other indicia of proof to lawfully operate and possess
      the vehicle in question, thus giving rise to objectively reasonable
      suspicion that the vehicle may be stolen.

(collecting cases). The defendants provided Officer Ramos with valid

licenses, registration, and insurance. Officer Ramos could not “justify the

continued detention . . . based on any specific, objective factors supporting a

reasonable inference that the [vehicle] was stolen, that the defendant[s] [were]

trafficking in drugs, or that [they] were committing any other criminal offense.”

      Indeed, Officer Ramos’ testimony suggests that he was acting on an

inchoate and unparticularized hunch rather than a reasonable articulable

suspicion. He testified that his

      suspicions just rose simply because, again, of the totality of the
      circumstances; not one factor, not an individual factor, but all of them.
      . . . I believed that there was criminal activity afoot, there was
      something wrong; but yet, there was nothing indicating that it would be
      just a stolen vehicle or drugs or a warrant or something else,


Aplt’s App. at 56-57; “there were a lot of things that, based on my training and

experience, just wasn’t [sic] right,” 

“I didn’t know what at the time; but

as the time went on . . . it was obvious that something was definitely not right.”

See 

(holding that there was insufficient

evidence of officer’s reasonable suspicion and noting that officer’s “testimony

                                          20
regarding his ‘sixth sense,’ his detection of a ‘tension in the air,’ and his belief

that something was ‘afoot,’ strongly suggests he was acting more on an

unparticularized hunch than on reasonable and objective suspicion”).

      After reviewing the record, we cannot find clear error in the district court’s

finding that Officer Ramos’ observation of the defendants’ shaking hands, heavy

breathing, and avoidance of eye contact were insufficient to support a reasonable

suspicion of illegal activity. Officer Ramos’ continued detention of the

defendants in the absence of such suspicion was a violation of their Fourth

Amendment rights.




                           B. Effect of Consent to Search

      We hold that Officer Ramos’ prolonged detention of the defendants was

supported neither by the regulatory purpose of checking their identification

documents nor by a reasonable suspicion of illegal activity. However, “[a] search

preceded by a Fourth Amendment violation remains valid if the consent to search

was voluntary in fact under the totality of the circumstances.” 

. “When there has been such a violation, the government bears the

heavy burden of showing that the primary taint of that violation was purged. To

satisfy this burden, the government must prove, from the totality of the

circumstances, a sufficient attenuation or break in the causal connection between

                                           21
the illegal detention and the consent.” 

(internal quotation

marks and citations omitted).

      Although no single factor is dispositive,

      [t]he Supreme Court has provided three factors that are especially
      relevant to determining whether a consent is tainted by a preceding
      illegal search or seizure: 1) the temporal proximity between the police
      illegality and the consent to search; 2) the presence of intervening
      circumstances; and particularly 3) the purpose and flagrancy of the
      official misconduct.


United States v. Melendez-Garcia, 

, 1054 (10th Cir. 1994) (citing

Brown v. Illinois, 

, 603-04 (1975)). Because the issue of the purging

of the taint of a Fourth Amendment violation “is fact-intensive, the district

court’s findings must be upheld unless they are clearly erroneous.” United States

v. Eylicio-Montoya, 

, 1165 (10th Cir. 1995).

1.    Temporal Proximity

      As discussed above, the detention became illegal when Officer Ramos

prolonged the detention past the point at which he determined that the vehicle’s

license plate was not expired. The defendants granted verbal consent to search

and signed the consent forms only a matter of minutes later. “We have repeatedly

held that consent is not voluntary when in such close temporal proximity to an

illegal [detention].” 

(citing 

(holding that consent was not voluntary when obtained ‘only a few minutes’ after

                                         22
the illegal seizure); 

(holding that consent was not

voluntary when ‘only moments’ elapsed between illegal detention and seizure);

and United States v. Maez, 

, 1455 (10th Cir. 1989) (holding that

taint of illegal seizure not purged when consent form signed 45 minutes later)).

2.    Intervening Circumstances

      The government argues that “there was a very significant ‘intervening

circumstance,’ between the presumed illegality and the consent.” Aplt’s Reply

Br. at 10. The government asserts that when Officer Ramos returned the

identification documents to Mr. Pina-Aboite and thanked him, the illegal

detention ended, and the subsequent interaction between Officer Ramos and the

defendants was a consensual encounter, which attenuated the taint of the illegal

detention. We disagree.

      Although in evaluating whether an encounter with law enforcement became

consensual, we apply an objective standard, United States v. Manjarrez, 

, 885-86 (10th Cir. 2003) (“An encounter is consensual when a reasonable

person would believe he was free to leave or disregard the officer’s request for

information.”),

      [i]n applying the second factor in Brown, we look only from the
      defendant’s perspective in determining whether any intervening event
      occurred which isolates the defendant from the coercive effects of the
      original illegal stop so as to render his subsequent consent voluntary in
      fact. For consent obtained subsequent to an illegal detention to be

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      voluntary in fact, there must be proof of facts or events which ensure
      that the consent provided by the defendant is truly voluntary and not the
      fruit of the illegal stop. The facts or events must create a discontinuity
      between the illegal stop and the consent such that the original illegality
      is weakened and attenuated.

(emphasis added).

      After Officer Ramos returned the identification documents to Mr. Pina-

Aboite and thanked him, he immediately called after Mr. Pina-Aboite, saying,

“You know what? Um, this car?” Aplt’s App. at 186. Mr. Pina-Aboite turned

around and walked directly back to Officer Ramos, asking “Do I need to change

the plates or what?” 

responded in the negative, and then

proceeded to ask Mr. Pina-Aboite a series of questions about where the

defendants had crossed to the border and whether they were carrying any drugs or

weapons, culminating in his request to search the car.

             Although we have established a bright-line rule that an encounter
      initiated by a traffic stop may not be deemed consensual unless the
      driver’s documents have been returned to him, a finding that a driver’s
      documentation was returned does not end the matter, as we have
      specifically indicated this is not always sufficient to demonstrate that
      an encounter has become consensual.


United States v. Bustillos-Munoz, 

, 515 (10th Cir. 2000) (internal

quotation marks and citations omitted). “Although not prerequisites, in

determining whether consent is voluntary when given following the return of

defendants’ documents, we look at such factors as whether the officer informed


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the defendant that he was free to leave the scene or that he could refuse to give

consent.” 

. See also Florida v. Bostick, 

,

432 (1991) (stating that informing a defendant of his right to refuse consent is a

factor “particularly worth noting”); United States v. Mendenhall, 

,

558 (1980) (noting that verbal advisement to defendant that she could decline

consent was “especially significant”). In McSwain, we held that “[the

defendant’s] consent was not sufficiently an act of free will to purge the primary

taint of the illegal detention,” observing that

      though [the officer’s] return of [the defendant’s] identification and the
      vehicle registration may be a factor indicating that [the defendant] was
      free to leave, [the officer] failed to specifically inform [the defendant]
      that he was free to leave the scene or that he could refuse to give his
      consent. These are important factors in our 

(internal quotation marks and citations omitted).

      When he returned the documents, Officer Ramos did not tell Mr. Pina-

Aboite that he was free to leave, and he immediately reinitiated conversation with

him about the car, the subject matter of the stop. Indeed, Mr. Pina-Aboite’s quick

return to Officer Ramos and his question about the license plate indicates his

concern that he was still in violation of the traffic laws and that he was not under

the impression that the detention had ended. The district court’s finding that

there was no intervening event creating a discontinuity between the illegal

detention and his eventual consent was not clearly erroneous.

                                          25
3.    Purpose and Flagrancy of Official Misconduct

      Finally, we examine the third Brown factor, the purpose and flagrancy of

the official misconduct. Although Officer Ramos was justified in initially

stopping the defendants based on his belief that the license plate was expired, his

conduct following his discovery that there was no traffic violation was not

justified, namely (a) his continued detention of the defendants in the absence of a

reasonable suspicion of illegal activity; (b) his checking of the dashboard VIN in

the absence of reasonable suspicion that the car was unregistered; (c) his

unauthorized second check of the VIN on the door panel, problematic under Caro,

and his concurrent questioning of Mr. Sepulveda; (d) his failure to advise Mr.

Pina-Aboite that he was free to go upon return of his documents; (e) his calling

Mr. Pina-Aboite back after returning his documents because he “wanted to see if

[Mr. Pina-Aboite] would be able to provide information to sustain or dispel [his]

suspicions,” Aplt’s App. at 90; and (f) his repetitive questioning about travel

plans and whether the defendants were carrying various kinds of contraband.

Officer Ramos’ behavior suggests that he detained the defendants “with a quality

of purposefulness, embarking on a fishing expedition in the hope that something

might turn up.” 

(internal quotation marks and citations

omitted); 

.

      Under the totality of the circumstances, and with special emphasis on the


                                         26
three Brown factors, we conclude that there was not “a sufficient attenuation or

break in the causal connection between the illegal detention and the consent.”

(internal quotation marks omitted). Thus, we agree with

the district court that the government failed to meet its heavy burden of proving

that the defendants’ consent to search the car was untainted by the Fourth

Amendment violation.




                                  CONCLUSION

      Although Officer Ramos’ initial traffic stop of the defendants was justified,

he unlawfully detained them beyond the purposes of the stop. The defendants’

subsequent consent to the search of the car was not sufficient to purge the taint of

the illegal detention. Accordingly, we AFFIRM the district court’s grant of the

defendants’ motion to suppress.



                                              Entered for the Court,


                                              Robert H. Henry
                                              Circuit Judge




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