270
Opinion of the Court
experience that criminal activity may be afoot and that the persons with whom he is dealing may be armed and presently dangerous, where in the course of investigating this behavior he identifies himself as a policeman and makes reasonable inquiries, and where nothing in the initial stages of the encounter serves to dispel his reasonable fear for his own or others' safety, he is entitled for the protection of himself and others in the area to conduct a carefully limited search of the outer clothing of such persons in an attempt to discover weapons which might be used to assault him." Id., at 30.
In the instant case, the officers' suspicion that J. L. was carrying a weapon arose not from any observations of their own but solely from a call made from an unknown location by an unknown caller. Unlike a tip from a known informant whose reputation can be assessed and who can be held responsible if her allegations turn out to be fabricated, see Adams v. Williams, 407 U. S. 143, 146-147 (1972), "an anonymous tip alone seldom demonstrates the informant's basis of knowledge or veracity," Alabama v. White, 496 U. S., at 329. As we have recognized, however, there are situations in which an anonymous tip, suitably corroborated, exhibits "sufficient indicia of reliability to provide reasonable suspicion to make the investigatory stop." Id., at 327. The question we here confront is whether the tip pointing to J. L. had those indicia of reliability.
In White, the police received an anonymous tip asserting that a woman was carrying cocaine and predicting that she would leave an apartment building at a specified time, get into a car matching a particular description, and drive to a named motel. Ibid. Standing alone, the tip would not have justified a Terry stop. 496 U. S., at 329. Only after police observation showed that the informant had accurately predicted the woman's movements, we explained, did it become reasonable to think the tipster had inside knowledge about the suspect and therefore to credit his assertion about the cocaine.
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