Defendants-appellants Mateen Yusuf Sha-bazz (Shabazz) and Keith Lamar Parker (Parker) were convicted on drug possession charges. They argue that evidence discovered in a warrantless search of the car in which they were traveling should have been suppressed, that the trial court erroneously failed to submit a “mere presence” jury instruction, and that their convictions rest on insufficient evidence. We affirm.
Facts and Proceedings Below
On July 10, 1991, Shabazz and Parker were traveling in a 1976 Chevrolet Malibu on Interstate 10 in Beaumont, Texas, when they were pulled over by two officers of the Beaumont Police Department for exceeding the speed limit. Officer Gerald LaChance approached Shabazz, who had been driving the car, and asked him to step to the rear of the vehicle with his driver’s license. Shabazz complied and produced what turned out to be a false driver’s license bearing the name Edward (or Edwin) L. Wallace. Parker remained in the vehicle. While running a computer check on Shabazz’s license, the officers questioned Shabazz and Parker individually. Comparing notes, the police officers determined that Shabazz and Parker had given conflicting answers concerning their recent whereabouts. Shabazz had said that he and Parker had been visiting Parker’s sister in Houston, where they had been for a week, since the Fourth of July. Parker, on the other hand, had said that they had only been in Houston since the eighth, just two days prior to the stop.
Based upon the conflict in their stories, and Officer Froman’s belief that Parker seemed nervous, the officers decided to seek consent to search the car. Because Parker had represented himself as the owner of the car, he was asked if he would consent to a search of the vehicle. Parker gave both written and oral consent to a search.
*434 During the search, Officer LaChance discovered a Phillips-head screwdriver on the front floorboard of the driver’s side of the car. He also observed that the screws in the front driver’s side air conditioner vent had shiny nicks on them and appeared to be loose. Using the screwdriver, Officer La-Chance loosened the screws. The vent thereupon fell open and out of it tumbled a number of plastic baggies, which contained over 300 grams of crack cocaine and over 100 grams of powder cocaine. Shabazz and Parker were immediately arrested.
A grand jury returned a two-count indictment against Shabazz and Parker charging them with possession with intent to distribute cocaine and possession with intent to distribute a cocaine mixture and substance containing cocaine base, in violation of 21 U.S.C. § 841(a). A jury trial was held in the Eastern District of Texas and defendants were convicted on both counts. The court sentenced Parker to 216 months’ imprisonment, to be followed by 6 years of supervised release, and a $100 special assessment. Sha-bazz received a 192 month sentence, 5 years of supervised release, and a $100 special assessment. Parker and Shabazz now appeal their convictions.
Discussion
Appellants raise three arguments on appeal. They argue that the trial court erred by failing to suppress the evidence found in the search of the automobile, that the court erred by failing to give the jury a “mere presence” instruction, and that the evidence was insufficient to prove that they knowingly possessed the cocaine. We will address these issues in turn.
1. Suppression of Evidence
Prior to trial, appellants
1
moved to suppress the evidence found in the search of the automobile as the fruits of a Fourth Amendment violation. Following an evidentiary hearing, the district court denied the motion. On appeal, we review the district court’s findings of fact for clear error; conclusions of law are examined
de novo. See United States v. Coleman,
The Fourth Amendment prohibits unreasonable searches and seizures. There is no question but that the stopping of a vehicle and the detention of its occupants is a “seizure” within the meaning of the Fourth Amendment.
See Delaware v. Prouse,
Under
Terry,
the judicial inquiry into the reasonableness of a search or seizure “is a dual one — whether the officer’s action was justified at its inception, and whether it was reasonably related in scope to the circumstances which justified the interference in the first place.”
Terry,
A.
Appellants do not argue, nor could they, that the initial stop of their vehicle for speeding was improper. This is so whether or not
Terry
applies.
See United States v. Causey,
“An officer conducting a routine traffic stop may request a driver’s license and vehicle registration, run a computer cheek, and issue a citation. When the driver has produced a valid license and proof that he is entitled to operate the car, he must be allowed to proceed on his way, without being subject to further delay by police for additional questioning. In order to justify a temporary detention for questioning, the officer must also have reasonable suspicion of illegal transactions in drugs or of any other serious crime.” Id.864 F.2d at 1519 .
*436
The reasoning of
Guzman
was apparently applied by this Court in the similar case of
United States v. Kelley, supra.
As in
Guzman,
the motorists in
Kelley
were stopped for seat belt violations and, subsequent to questioning by police officers, were discovered to be in possession of drugs.
4
“We do not disagree with the Tenth Circuit,” said
Kelley,
“that, under appropriate circumstances, excessive questioning about matters wholly unrelated to the purpose of a routine traffic stop may violate the Fourth Amendment.”
The Fourth Amendment injury found in
Guzman
and assumed
arguendo
in Kelley
5
was a violation of Terry’s second prong: that the scope of a search must be reasonably related to its initial justification.
See Terry,
At the outset, we reject any notion that a police officer’s questioning, even on a subject unrelated to the purpose of the stop, is itself a Fourth Amendment violation. To be sure, one can find suggestive statements to this effect in the case law.
See, e.g., Kelley,
*437
Here, appellants cannot successfully claim that the detention exceeded its original scope. Appellants concede, and we have no doubt, that in a valid traffic stop, an officer can request a driver’s license, insurance papers, vehicle registration, run a computer check thereon, and issue a citation.
See Kelley,
Support for our conclusion can be found in one of
Guzman’s
Tenth Circuit progeny,
United States v. Walker,
“Under the reasoning of United States v. Morales-Zamora,914 F.2d 200 (10th Cir.1990), our determination that the defendant was unlawfully detained might be different if the questioning by the officer did not delay the stop beyond the measure of time necessary to issue a citation. For example, this ease would be changed significantly if the officer asked the same questions while awaiting the results of an NCIC [National Crime Information Center] license or registration inquiry.” Id.933 F.2d at 816 n. 2 (emphasis added). 8
So too in this case, appellants cannot complain of questioning that took place during the pendency of a computer check. While appellants were under no obligation to answer the questions, the Constitution does not forbid law enforcement officers from asking.
We recognize that a detention may be of excessively long duration even though the officers have not completed and continue to pursue investigation of the matters justifying its initiation.
See, e.g., Sharpe,
“While it is clear that ‘the brevity of the invasion of the individual’s Fourth Amendment interests is an important factor in determining whether the seizure is so minimally intrusive as to be justifiable on reasonable suspicion,’ we have emphasized the need to consider the law enforcement purposes to be served by the stop as well as the time reasonably needed to effectuate those purposes.”470 U.S. at 685 ,105 S.Ct. at 1575 (quoting United States v. Place, [462 U.S. 696 , 707],103 S.Ct. 2637 , 2645 [77 L.Ed.2d 110 ] (1983)).
In this case, the law enforcement interest to be served by running a computer check on the license of someone stopped for a traffic violation is unquestioned. It is also clear that the time it took for Officers La-Chance and Froman to run the check im *438 posed no significant Fourth Amendment hardship. Officer LaChance testified that, depending upon the number of checks being requested of the lone teletype operator, a computer check can take anywhere from two to three to ten to fifteen minutes. He also testified that in this instance only about four minutes elapsed from the time that the car was stopped to the time Parker gave consent.
The district court found “that the period of detention by the officers was not beyond the scope of the initial purpose for the stop, which was speeding” and “this detention did not go beyond that purpose.” He implicitly credited the testimony of the officers that the questioning and consent to search' took place while the officers were awaiting the results of the computer check and that this process lasted only about four minutes. These findings are supported by the evidence and are not clearly erroneous. Based upon these facts, we cannot say that the period of appellants’ detention was either unreasonably lengthy or extended beyond the period justified by the valid speeding stop.
B.
We now turn to the issue of the validity of the consent to search. The standards governing the judicial assessment of the voluntariness of a tendered consent were described in
Kelley,
“ ‘To be valid, consent to search must be free and voluntary.’ United States v. Olivier-Becerril,861 F.2d 424 , 425 (5th Cir.1988). The government has the burden of proving, by a preponderance of the evidence, that the consent was voluntary. United States v. Yeagin,927 F.2d 798 , 800 (5th Cir.1991). Where consent is preceded by a Fourth Amendment violation, the government has a heavier burden of proving consent. United States v. Ruigomez,702 F.2d 61 , 65 (5th Cir.1983). The voluntariness of consent is ‘a question of fact to be determined from the totality of all the circumstances.’ Schneckloth v. Bustamonte,412 U.S. 218 , 227,93 S.Ct. 2041 , 2048,36 L.Ed.2d 854 (1973). We will not reverse the district court’s finding that consent was voluntary unless it is clearly erroneous. Olivier-Becerril,861 F.2d at 425-26 . Where the judge bases a finding of consent on the oral testimony at a suppression hearing, the clearly erroneous standard is particularly strong since the judge had the opportunity to observe the demeanor of the witnesses.’ United States v. Sutton,850 F.2d 1083 , 1086 (5th Cir.1988).”
In evaluating the voluntariness of a consent, this Court has looked to six factors:
“(1) the voluntariness of the defendant’s custodial status; (2) the presence of coercive police procedures; (3) the extent and level of the defendant’s cooperation with the police; (4) the defendant’s awareness of his right to refuse to consent; (5) the defendant’s education and intelligence; and (6) the defendant’s belief that no incriminating evidence will be found.” Olivier-Becerril,861 F.2d at 426 (citations omitted).
Although all six factors are relevant, no single factor is dispositive. See id.
The district court made specific findings concerning all six of these factors, expressly recognizing that the government had the burden to show voluntary consent by a preponderance of the evidence. As to the first factor, voluntariness of custodial status, the court found that the defendants “were not free to leave until the officers finished their check of the driver’s license or vehicle tag ... they were checking on the radio,” and that this “militate[d] against the government.” Concerning the defendant’s awareness of his right to refuse consent, the fourth factor, this also “militate[d] against the government” to the extent that “Parker apparently was not specifically told by Officer La-Chance that he had a right to refuse to consent”; however, the court also found in this connection that the officers gave Parker a written consent form to read, that “[t]he form itself informs Mr. Parker of his right to refuse consent,” 9 that there was no evidence *439 Parker “didn’t read it” and that he was “a high school graduate and presumably can read.” As to each of the remaining four factors, the court found for the government, finding “there was not the presence of coercive police procedures here,” that “defendants cooperated fully,” that Parker “has a high school education,” and that “Parker believed no incriminating evidence would be found.” While there was conflicting evidence on some of these factors, there is evidence to adequately support each of the district court’s findings, and the findings are not clearly erroneous. After making the foregoing findings, the district court ultimately found “that the consent to search was given voluntarily by Mr. Parker without coercion.”
Based on the district court’s specific findings as to each of the six factors, and considering the evidence as a whole, we cannot say that the district court’s ultimate finding, that Parker voluntarily and without coercion consented to the search, was clearly erroneous or influenced by an incorrect view of the law. 10
Appellants have failed to demonstrate that the district court erred by denying their motion to suppress. 11
11. The “Mere Presence” Instruction
Appellants argue that the trial court erred by failing to give the jury a “mere presence” charge — i.e., an instruction that one’s presence in the area where drugs are found or association with the person actually in control of the drugs, is insufficient to support a finding of possession. Although such an instruction is abstractly an accurate statement of the law,
see United States v. Stephenson,
McKnight
also affords a second basis for rejecting appellants’ assignment of error. “McKnight’s claim fails,” we said, “because this case, unlike
Cordovcir-Larios,
is, by its undisputed facts, not a
‘mere
presence’ case.”
“The dominion and control associated with owning and living in a small, open house like McKnight’s ... is utterly inconsistent with the legal conclusion that McKnight was ‘merely present’ in a house full of guns and drugs in its common areas (and a gun in the dresser used by McKnight).” Id. at 903 (emphasis in original).
*441
By contrast, the facts of
Cordova-Larios,
which we recount in the margin, are far more amenable to such a defense than are the facts of
McKnight.
15
As we said, “The record sufficiently supports the defensive theory of mere presence to entitle the defendant to the requested instruction.”
Cordova-Larios,
We believe that this ease is closer to McKnight than to Cordovcir-Larios. There is no evidence that appellants were mere bystanders who happened to be at the scene of a crime, as in Cordovcir-Larios. Quite the contrary, as in McKnight, the drugs were indisputably discovered in a location the control over which cannot be fairly attributed to anyone but appellants. Accordingly, it was not error to refuse the mere presence instruction.
III. The Sufficiency of the Evidence
Appellants’ final challenge is to the sufficiency of the evidence. We will sustain the convictions if a rational jury could have found as to each appellant that each of the elements of the offense was established beyond a reasonable doubt.
See Jackson v. Virginia,
A. Possession
Possession, as noted previously, may be actual or constructive. Ownership, dominion, or control over the contraband, or over the vehicle in which it was concealed, constitutes constructive possession. Here, Shabazz was driving, and Parker was riding in, the car in which the cocaine was discovered. Parker represented that he owned the vehicle. The two were traveling together, and had been together in Houston for several days. Accordingly, the jury could easily have found that appellants were in constructive possession of the cocaine.
B. Knowing
We have said that, “Knowledge of the presence of contraband may ordinarily be inferred from the exercise of control over the vehicle in which it is concealed.”
United States v. Garcia,
Conclusion
For the reasons stated herein, appellants’ convictions are
AFFIRMED.
Notes
. The government initially challenged the standing of Shabazz, who was driving the car but made no claim to be its owner, to challenge the search as violative of the Fourth Amendment. The district court ruled that Shabazz had the requisite standing. As the government does not raise the issue of standing on appeal, and in light of our affirmance of the district court's denial of the motion to suppress, we do not address the district court's ruling in this respect.
Cf. Rakas v. Illinois,
. Some of our cases have termed this practice a “vehicle frisk.”
See United States v. Hernandez,
. Although some courts have held that a lawful traffic stop may nonetheless violate the Fourth Amendment if the stop was merely a pretext to allow officers to search for contraband,
see United States v. Smith,
. Kelley is also strikingly similar to this case. As here, the Kelley motorists were coming from Houston, were stopped on I — 10 in Beaumont, gave conflicting answers, appeared nervous, and eventually consented to a search of the car. Also, the arresting officers in Kelley, as here, were the ever-vigilant LaChance and Froman of the Beaumont Police Department.
. Kelley did not decide if the Fourth Amendment had been violated because it concluded that defendant's consent to the search cured any violation that might have occurred. Guzman did hold that the Fourth Amendment had been violated but then remanded to determine if the defendants had given a valid consent to the search.
. See also INS v. Delgado,
. Ordering someone to get out of a car is itself a "seizure,” but a constitutionally permissible one when done incident to a lawful traffic stop. See Pennsylvania v. Mimms, supra.
. Morales-Zamora had held that a canine sniff of defendants’ vehicle at a roadblock checkpoint was not an unreasonable detention because agents completed the canine sniff before another agent had finished examining the driver's license and registration.
. The form, which Parker signed, stated:
"I understand I have the right to refuse consent to the search described above and to refuse to sign this form. I further state no promises, threats, force, or physical or mental coer *439 cion of any kind whatsoever have been used against me.”
Parker also orally consented to the search.
. We have held that the district court did not err in its determination that the detention was valid and did not extend beyond the period justified by the valid speeding stop. Nevertheless, we observe that the district court also found that "even if this detention went beyond that period necessitated by the speeding stop, the consent validated the search.” This determination by the district court, while not necessary to its decision or ours, appears to be valid under our holding in
Kelley,
where we applied "the
Brown
[v.
Illinois
[
. Our analysis assumes,
arguendo only,
that decisions such as
United States v. Robinson,
. At the charge conference defense counsel stated "I want to make sure that the Court’s definition of 'possession' includes the fact that the mere presence alone is not sufficient, that mere presence alone is not sufficient to convict the defendants.” The court inquired if counsel were "objecting to the definition of ‘possession,’ ” and counsel replied "insofar as it does not include a statement as to the mere presence, it does not in itself prove up possession and would not enable — enable the jury to convict the defendants just because they were present.” The court responded "I don’t think the charge permits them to convict either defendant simply because they were present.... they have to find possession. 'Possession' is defined here.” Later, defense counsel argued that "the proper precautionary instruction that mere presence alone — by not placing it in there, you’re lessening the government's burden of proof,” and objected "to the Court’s failing to instruct the jury on 'mere presence’ because we feel that the foundation of the case warrants it and that’s the whole thrust of the case. By failing to include it, it amounts to a *440 comment on the weight of the evidence by the Court and it denies the effective assistance of counsel because we will not be able to argue it effectively....” The defense never tendered'— orally or in writing — the “mere presence” instruction they desired. We assume, arguendo, that the objections were adequate so that we may properly treat the case as if an instruction had been requested (and objection made to the refusal to give it) that "mere presence in the area where the narcotic is discovered or mere association with the person who does control the drug or the property where it is located, is insufficient to support a finding of possession." Stephenson at 1355.
. It is settled law that this Court will reverse the refusal to give a requested jury instruction only if that instruction
"(1) was substantially correct; (2) was not substantially covered in the charge delivered to the jury; and (3) concerned an important issue so that the failure to give it seriously impaired the defendant's ability to present a given defense.” United States v. Duncan,919 F.2d 981 , 990 (5th Cir.1990), cert. denied, -U.S. -,111 S.Ct. 2036 ,114 L.Ed.2d 121 (1991).
. The trial court instructed the jury as follows:
"Possession, as that term is used in this case, may be of two kinds: actual possession and constructive possession. A person who knowingly has direct physical control over a thing, at a given time, is then in actual possession of it.
A person who, although not in actual possession, knowingly has both the power and the intention, at a given time, to exercise dominion or control over a thing, either directly or through another person or persons, is then in constructive possession of it.
Possession may be sole or joint. If one person alone has actual or constructive possession of a thing, possession is sole. If two or more persons share actual or constructive possession of a thing, possession is joint.
You may find that the element of possession, as that term is used in these instructions, is present if you find beyond a reasonable doubt that the defendant had actual or constructive possession, either alone or jointly with others.” (Emphasis added).
. In Cordova-Larios, the defendant was a passenger in a truck owned his brother-in-law and driven by a man named Saenz who the two had met only the previous day. The brother-in-law had loaned the truck to Saenz, not the defendant, for Saenz to travel from Juarez, Mexico to Albuquerque, New Mexico. The defendant came along with the intention of buying goods. Border patrol agents gave chase after Saenz stopped the truck on a road by the Rio Grande and someone who had been hiding in bushes placed several bundles of marihuana in the bed of the truck. During the chase, the defendant fell out of the truck. The defendant testified that he had attempted to wrest control of the truck from Saenz but the latter had pushed him out of the passenger door.
. Appellants stipulated that, if the government proves knowing possession, they would concede intent to distribute.
