motorist while he runs a computer check to determine to whom the vehicle is registered, see United States v. Rutherford, 824 F.2d 831, 834 (10th Cir.1987), the running of such a computer check is not the only reasonable means of investigating a possible ear theft. Instead, we have concluded that officers confronted with a motorist who cannot produce proof of ownership may ask questions about the identity and travel plans of the driver and passengers.
For example, in United States v. Miller, 84 F.3d 1244 (10th Cir.1996), a police officer stopped a van for speeding. When the driver was unable to produce registration papers or proof of insurance, the officer asked the driver a series of questions, including who owned the van and where he was going. When the driver said that he was traveling to Kansas to see his ex-wife, bring a present to his daughter, and help the passenger find a job, the officer asked how long he had known the passenger. See Miller, 84 F.3d at 1248. This circuit rejected the driver’s argument that the officer’s questioning violated the Fourth Amendment. See id. at 1250-51 (“The initial questioning while [the driver] was in the car presents no Fourth Amendment problem.”). We reasoned that in light of the driver’s failure to produce registration papers or proof of insurance, the officer “had reasonable suspicion the van might be stolen, which justified further investigation.” Id. at 1251.
The questions asked by the officer in Miller resemble the questions asked by Officer Martinez in the instant case. Just as the Miller driver’s failure to produce registration papers justified further investigation that included questions about the passenger’s identity, so Mr. Galindo-Gonzales’s failure to produce registration papers justified further questioning by Officer Martinez. We acknowledge that our decisions do not set forth a definitive list of particular questions that an officer may ask a motorist when he has a reasonable suspicion that a vehicle is stolen. However, the questions asked by Officer Martinez here — who the men in the Chevy Blazer were and, after Mr. Galindo-Gonzales did not answer that question, whether the men had identification — are both sufficiently related to determining ownership of the vehicle such that it was reasonable for Officer Martinez to ask them.
We note that in his testimony at the evidentiary hearing, Officer Martinez did not invoke Mr. Galindo-Gonzales’s failure to produce registration papers as a justification for asking questions about the passengers’ identity. Instead, he said that he asked the questions because he suspected that the men were illegal aliens and because he was concerned about his safety. See Rec. vol. II at 35. Nevertheless, our analysis of the reasonableness of Officer Martinez’s questions under the Fourth Amendment is not limited by his own account of his motivation in asking them. In Whren v. United States, 517 U.S. 806, 116 S.Ct. 1769, 135 L.Ed.2d 89 (1996), the Supreme Court explained that “[n]ot only have we never held, outside the context of inventory search or administrative inspection ... that an officer’s motive invalidates objectively justifiable behavior under the Fourth Amendment; but we have repeatedly held and asserted to the contrary.” Whren, 517 U.S. at 812-14, 116 S.Ct. at 1774 (citing United States v. Villamonte-Marquez, 462 U.S. 579, 584 n. 3, 103 S.Ct. 2573, 2577 n. 3, 77 L.Ed.2d 22 (1983); United States v. Robinson, 414 U.S. 218, 94 S.Ct. 467, 38 L.Ed. 2d 427 (1973); Gustafson v. Florida, 414 U.S. 260, 266, 94 S.Ct. 488, 492, 38 L.Ed.2d 456 (1973); Scott v. United States, 436 U.S. 128, 98 S.Ct. 1717, 56 L.Ed.2d 168 (1978)). “[T]he fact that the officer does not have the state of mind which is hypothecated by the reasons which provide the legal justification for the officer’s action does not invalidate the action taken as long as the circumstances, viewed objectively, justify that action.” Scott, 436 U.S. at 138, 98 S.Ct. at 1723-24.
Accordingly, even though Officer Martinez did not characterize his questioning about the passengers as part of an investigation of a possible car theft, the fact that Mr. Galin-do-Gonzales failed to produce registration papers provided an objective justification for the questions that he actually asked. We therefore conclude that Officer Martinez had the necessary reasonable suspicion to question Mr. Galindo-Gonzales about the passengers and that, as a result, the detention of