United States v. Brignoni-Ponce (1975)
The Supreme Court reviewed a Border Patrol stop of a car whose occupants appeared to be of Mexican ancestry. The agents had no other reason to suspect the car carried undocumented immigrants. The Court ruled that apparent ancestry alone cannot justify a stop.
Border Patrol had to point to specific facts before stopping vehicles.
The decision established reasonable suspicion as the standard for immigration stops and is still cited in profiling cases.
The new injunction applies the same principle to ICE and Border Patrol stops in Southern California.
