Whren v. United States

In this case we decide whether the temporary detention of a motorist who the police have probable cause to believe has committed a civil traffic violation is inconsistent with the Fourth Amendment’s prohibition against unreasonable seizures unless a reasonable officer would have been motivated to stop the car by a desire to enforce the traffic laws.

I

On the evening of June 10, 1993, plainclothes vice-squad officers of the District of Columbia Metropolitan Police Department were patrolling a “high drug area” of the city in an unmarked car. Their suspicions were aroused when they passed a dark…