that of the driver.” Ibid. Moreover, the Court noted, “as a practical matter, the passengers are already stopped by virtue of the stop of the vehicle,” id., at 413-414, so “the additional intrusion on the passenger is minimal,” id., at 415.
Completing the picture, Brendlin held that a passenger is seized, just as the driver is, “from the moment [a car stopped by the police comes] to a halt on the side of the road.” 551 U. S., at 263. A passenger therefore has standing to challenge a stop’s constitutionality. Id., at 256-259.
After Wilson, but before Brendlin, the Court had stated, in dictum, that officers who conduct “routine traffic stop[s]” may “perform a ‘patdown’ of a driver and any passengers upon reasonable suspicion that they may be armed and dangerous.” Knowles v. Iowa, 525 U. S. 113, 117-118 (1998). That forecast, we now confirm, accurately captures the combined thrust of the Court’s decisions in Mimms, Wilson, and Brendlin.
B
The Arizona Court of Appeals recognized that, initially, Johnson was lawfully detained incident to the legitimate stop of the vehicle in which he was a passenger. See 217 Ariz., at 64,170 P. 3d, at 673. But, that court concluded, once Officer Trevizo undertook to question Johnson on a matter unrelated to the traffic stop, i. e., Johnson’s gang affiliation, patdown authority ceased to exist, absent reasonable suspicion that Johnson had engaged, or was about to engage, in criminal activity. See id., at 65, 170 P. 3d, at 674. In support of the Arizona court’s portrayal of Trevizo’s interrogation of Johnson as “consensual,” Johnson emphasizes Trevizo’s testimony at the suppression hearing. Responding to the prosecutor’s questions, Trevizo affirmed her belief that Johnson could have “refused to get out of the car” and “to turn around for the pat down.” App. 41.
It is not clear why the prosecutor, in opposing the suppression motion, sought to portray the episode as consensual. Cf. Florida v. Bostick, 501 U. S. 429 (1991) (holding that po