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.
United States v. Gonzalez-Lerma, 14 F.3d 1479, 1483 (10th Cir.1994) teaches that further questioning and the concomitant detention of a driver are permissible in either of two circumstances: (1) during the course of the traffic stop the officer acquires an objectively reasonable and articulable suspicion that the driver is engaged in illegal activity (see, e.g., United States v. Soto, 988 F.2d 1548, 1554 (10th Cir.1993); United States v. Horn, 970 F.2d 728, 732 (10th Cir.1992)) or (2)the driver voluntarily consents to the officer’s additional questioning. In the first situation a Fourth Amendment seizure has taken place, but it is reasonable and consequently constitutional. In the second there is no seizure, and hence the Fourth Amendment’s strictures are not implicated. But if neither of those factors is present, evidence derived from further questioning (or, a forti-ori, from an ensuing search) is impermissibly tainted in Fourth Amendment terms.
On appeal Sandoval argues that his Fourth Amendment right to be free from unreasonable searches and seizures was violated because neither of the two described circumstances was present, rendering his continued detention and the later search of the truck improper. Because the district judge based his rejection of that argument on his finding that the search of the truck took place during a police-citizen encounter to which Sandoval consented voluntarily, that issue will be addressed first.
Voluntariness of the Continued Encounter
Florida v. Bostick, 501 U.S. 429, 439, 111 S.Ct. 2382, 2389, 115 L.Ed.2d 389 (1991) has reconfirmed the Supreme Court's adherence:
to the rule that, in order to determine whether a particular encounter constitutes a seizure, a court must consider all the circumstances surrounding the encounter to determine whether the police conduct would have communicated to a reasonable person that the person was not free to decline the officers’ requests or otherwise terminate the encounter.
That totality-of-the-circumstances approach means that "[n]o single factor dictates whether a seizure has occurred" (United States v. Houston, 21 F.3d 1035, 1037 (10th Cir.1994)). In the context of traffic stops this Circuit has adopted as an indicium of a seizure the officer's taking of necessary documentation (driver's license and vehicle registration) from a driver, and we have also considered as a necessary (but not always sufficient) condition of the termination of that seizure the officer's return of such documentation-both of those rulings being based on the premise that the requisite consent is impossible because no "reasonable person" would feel free to leave without such documentation (United States v. McKneely, 6 F.3d 1447, 1451 (10th Cir.1993)).
After the point at which the driver has his or her other documentation back, the touchstone of our analysis is simply whether-adapting the language, of Bostick to the circumstances of a traffic stop-the driver (United States v. Werking, 915 F.2d 1404, 1408 (10th Cir.1990)):
has an objective reason to believe that he was not free to end his conversation with the law enforcement officer and proceed on his way.
Where such a belief is present based on the “objective” facts of the situation, a voluntary police-citizen encounter is said to arise (see, e.g., McKneely, 6 F.3d at 1451-53; Werking, 915 F.2d at 1409).
In this case the district court's Opinion at 361 explained its conclusion that Sandoval had consented to the search during such an encounter solely in terms of thE factors we had set out in United States v. Turner, 928 F.2d 956, 959 (10th Cir.1991). Turner, id. stated that a "coercive show of authority" by an officer that would negate a reasonable person's belief that he or she was free to leave would include items:
such as the presence of more than one officer, the display of a weapon, physical touching by the officer, or his use of a