In Arizona v. Johnson, 555 U.S. 323, the Supreme Court held unanimously that during a lawful traffic stop, a police officer may pat down a passenger for weapons whenever the officer reasonably suspects the passenger is armed and dangerous. The officer does not need any separate suspicion that the passenger has committed, is committing, or is about to commit a crime. Justice Ruth Bader Ginsburg wrote the opinion.1Justia. Arizona v. Johnson, 555 U.S. 323
The Tucson Stop
The case grew out of a 2002 traffic stop in Tucson. Officers pulled over a vehicle for a civil infraction that warranted a citation. Lemon Johnson was in the back seat. While speaking with him, an officer noticed a scanner in his jacket and clothing associated with a local gang, and came to suspect he might be armed. The officer had Johnson step out of the car and patted him down. The frisk turned up a gun.1Justia. Arizona v. Johnson, 555 U.S. 323
The Two-Part Rule the Court Set
The Court organized the authority to frisk a passenger around two requirements. The initial stop of the vehicle must be lawful. And the officer must have reasonable suspicion, based on specific facts, that the person to be frisked is armed and dangerous.1Justia. Arizona v. Johnson, 555 U.S. 323
What the Court made explicit is what the second requirement is not. It is not a requirement that the passenger be suspected of a crime. The frisk is a safety measure, not an evidence search, so the officer’s reason to act has to point at danger, not at wrongdoing. In Johnson’s case, the scanner and the gang indicators were enough.1Justia. Arizona v. Johnson, 555 U.S. 323
The frisk itself stays narrow. It is a pat-down of outer clothing for weapons, nothing more, under the limits the Court set in Terry v. Ohio.2Legal Information Institute. Terry v. Ohio, 392 U.S. 1
Why a Passenger Is Already Seized
The decision rests on an earlier point the Court had settled in Brendlin v. California: when police stop a car, everyone in it is seized under the Fourth Amendment. A reasonable passenger does not feel free to get out and walk off while the officer is working with the driver.3Justia. Brendlin v. California, 551 U.S. 249
Because the passenger is already lawfully detained for the duration of the stop, no new justification is needed to keep them there. The officer’s safety interest covers everyone in the car, and the frisk question turns only on whether the specific person appears to be armed and dangerous.1Justia. Arizona v. Johnson, 555 U.S. 323
How Long the Authority Lasts
The authority to detain, and with it the authority to frisk under Johnson, runs only as long as the traffic stop itself. A stop lasts for the time reasonably needed to handle the traffic mission: checking the license, registration, insurance, and warrants, and issuing a ticket or warning.4Justia. Rodriguez v. United States, 575 U.S. 348
Once those tasks are done, or should reasonably have been done, the seizure ends. If an officer wants to keep a passenger at the scene past that point, there has to be new, independent reasonable suspicion. Prolonging a stop to run an unrelated investigation, without that added basis, violates the Fourth Amendment.4Justia. Rodriguez v. United States, 575 U.S. 348