United States v. Cortez

Background

Border Patrol officers investigating repeated desert footprints identified a pattern. They called the suspected guide “Chevron.” From past tracks they learned Chevron usually led groups at night to milepost 122 on Highway 86 on clear weekend nights. Officers watched from milepost 149, saw a pickup make an east-west-east round trip consistent with a pickup run, stopped the vehicle, and found six people who had crossed the border illegally. The driver and passenger were charged with transporting illegal aliens and were convicted in district court; the Ninth Circuit reversed the convictions.

Reasoning

The Court addressed whether objective facts and reasonable inferences can justify a brief investigative stop of a particular vehicle. Looking at the whole picture, the Justices said officers may combine specific observations, background knowledge, and commonsense inferences to form a particularized suspicion about a vehicle. The stop here was limited to questioning about citizenship and immigration status, not a search. On this record the Court concluded experienced Border Patrol officers could reasonably suspect the stopped pickup was involved in smuggling, and it reversed the Court of Appeals.

Real world impact

The decision allows border officers to rely on patterns, timing, vehicle type, and professional experience to make limited stops when the totality of circumstances points to smuggling activity. The ruling emphasizes that such stops are a lower level of intrusion than a search and do not require probable cause for arrest. It governs when brief questioning is lawful in remote border areas.

Dissents or concurrances

Justice Stewart (concurring in the result) stressed that the officers had abundant specific facts and reasonable inferences here. Justice Marshall joined the judgment.