Whether a passenger lawfully detained during a traffic stop may be frisked when police lack reasonable suspicion that the passenger is engaged in criminal activity unrelated to the traffic violation.
Holding
Yes. A lawful traffic stop supplies the lawful-stop component of Terry for every occupant of the vehicle; police need not separately suspect a passenger of criminal activity before conducting a frisk.
Reasoning
Terry permits a limited patdown when two conditions are satisfied: the person is lawfully stopped, and the officer reasonably suspects that person is armed and dangerous. In the traffic-stop context, the first condition is met when officers lawfully stop the vehicle for a traffic violation. Under Brendlin, the stop seizes both the driver and all passengers from the moment the car comes to a halt.
The Court read Terry together with Pennsylvania v. Mimms, Maryland v. Wilson, and Brendlin v. California. Mimms permits officers to order a lawfully stopped driver out of a car and to frisk the driver upon reasonable suspicion that the driver is armed and dangerous. Wilson extends the authority to order occupants out of the vehicle to passengers because traffic stops create comparable safety risks for officers regardless of an occupant's status as driver or passenger.
Traffic stops are especially dangerous, and an officer's authority to control the scene protects both officers and occupants. A passenger may have as much reason as a driver to use violence to avoid detection of a more serious offense. Thus, once a passenger is already lawfully seized as part of a traffic stop, the Fourth Amendment does not require an additional, passenger-specific suspicion of criminal activity before a protective frisk; reasonable suspicion that the passenger is armed and dangerous is enough.