Plainclothes vice-squad officers in an unmarked car observed a truck stopped at a stop sign for an unusually long time in a high-drug area of Washington, D.C. When the truck suddenly turned without signaling and sped off, the officers stopped it for traffic violations. As an officer approached, he saw plastic bags of crack cocaine in the hands of passenger James L. Whren. Whren and the driver were arrested and challenged the stop as unreasonable, arguing the traffic rationale was pretext for drug investigation.
Does the Fourth Amendment forbid a traffic stop supported by probable cause to believe a traffic violation occurred when the officers' actual motive was to investigate other suspected criminal activity?
A traffic stop is reasonable under the Fourth Amendment when police have probable cause to believe a traffic violation has occurred. The constitutional reasonableness of the stop does not depend on the subjective motivations of the officers involved.
No. The Court held that a stop based on probable cause of a traffic violation is objectively reasonable under the Fourth Amendment even if the officers had an ulterior investigative motive.
The Court applied the general Fourth Amendment principle that reasonableness is judged objectively, not by examining an officer's actual state of mind. It rejected a proposed rule requiring courts to ask whether a reasonable officer would have made the stop absent some additional law-enforcement objective, explaining that such inquiries are impractical and inconsistent with precedent. The Court distinguished prior cases involving special contexts, such as administrative inspections and inventory searches, where programmatic limits matter. Because the officers observed traffic violations, the stop was valid, and any selective or discriminatory enforcement concern was left to the Equal Protection Clause rather than the Fourth Amendment.
Whren is the leading case authorizing so-called pretextual traffic stops under the Fourth Amendment and firmly establishes the objective test for ordinary traffic seizures. It is closely tied to the Court's objective-reasonableness approach in Scott v. United States, 436 U.S. 128 (1978), and has shaped later vehicle-stop doctrine, including Heien v. North Carolina, 574 U.S. 54 (2014), and Devenpeck v. Alford, 543 U.S. 146 (2004). The decision is also important because it channels claims of racially selective traffic enforcement away from the Fourth Amendment and toward equal protection analysis.
Scott v. United States, 436 U.S. 128 (1978) |
Abstain |
Heien v. North Carolina, 574 U.S. 54 (2014) |
Abstain |
Devenpeck v. Alford, 543 U.S. 146 (2004) |
Abstain |
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