Takeaway
In short, this case holds that when police have probable cause to search a readily movable car, they may search it without a warrant even after taking it to the station house; the Court treated that search as constitutionally equivalent to immediately searching or temporarily seizing the vehicle.
After two armed men robbed a Gulf service station in North Braddock, Pennsylvania, witnesses reported that a light-blue compact station wagon carrying four men had fled nearby. They described one man as wearing a green sweater; the victim also described the robbers as wearing a green sweater and a trench coat. Within an hour, police stopped a matching station wagon about two miles away. Chambers was one of its four occupants, wore a green sweater, and a trench coat was in the car.
Police arrested all four men and took the station wagon to the police station. During a thorough warrantless search there, officers found two .38-caliber revolvers, a glove containing coins, and cards belonging to the victim of an earlier service-station robbery. The day after the arrest, police conducted a warrant-authorized search of Chambers's home and seized .38-caliber ammunition. Chambers was convicted of both robberies after his first trial ended in a mistrial.
Chambers later pursued state and then federal habeas relief, challenging the vehicle search, the admission of the ammunition found at his home, and the effectiveness of counsel at his second trial. The federal district court denied relief without an evidentiary hearing, and the Third Circuit affirmed. The Supreme Court granted certiorari and affirmed.