Whether an officer has reasonable suspicion under the Fourth Amendment to make a Terry stop when a person makes unprovoked, headlong flight after seeing police in an area known for heavy narcotics trafficking.
Holding
Yes. Wardlow's unprovoked flight, considered together with the area's heavy narcotics activity, gave the officers reasonable suspicion to stop him briefly and investigate further.
Reasoning
Under Terry v. Ohio, an officer may briefly detain a person for investigation when the officer has a reasonable, articulable suspicion that criminal activity is occurring. Reasonable suspicion requires less than probable cause, but it must rest on objective, particularized facts rather than an unparticularized hunch.
Wardlow's presence in an area of expected criminal activity could not, standing alone, justify a stop. But the character of a location is a relevant contextual fact. Officers need not disregard that a particular area is known for heavy narcotics trafficking when deciding whether otherwise suspicious conduct warrants investigation.
The additional fact here was Wardlow's unprovoked, headlong flight upon noticing the police. The Court treated such flight as the consummate act of evasion: it is not invariably proof of criminal conduct, but it is strongly suggestive of it. Courts may draw commonsense inferences about human behavior and need not demand scientific certainty before recognizing flight as suspicious.
The holding did not undermine the rule that a person ordinarily may refuse to answer police questions and go about his business. Mere refusal to cooperate does not justify a seizure. But running away from officers is not simply declining to cooperate or peacefully going about one's business; it is conduct that permits officers to stop the person briefly to resolve the resulting ambiguity.
That innocent explanations for flight exist did not defeat reasonable suspicion. Terry itself permits an officer to investigate conduct that is lawful and capable of innocent explanation when, viewed in context, it reasonably suggests criminal activity. A brief stop accepts some risk that innocent people will be detained, while requiring that they be allowed to leave if the investigation does not produce grounds for further action. The Court did not decide whether the frisk was independently lawful, because review was limited to the validity of the initial stop.