272
Opinion of the Court
for United States 16. These contentions misapprehend the reliability needed for a tip to justify a Terry stop.
An accurate description of a subject's readily observable location and appearance is of course reliable in this limited sense: It will help the police correctly identify the person whom the tipster means to accuse. Such a tip, however, does not show that the tipster has knowledge of concealed criminal activity. The reasonable suspicion here at issue requires that a tip be reliable in its assertion of illegality, not just in its tendency to identify a determinate person. Cf. 4 W. LaFave, Search and Seizure § 9.4(h), p. 213 (3d ed. 1996) (distinguishing reliability as to identification, which is often important in other criminal law contexts, from reliability as to the likelihood of criminal activity, which is central in anonymous-tip cases).
A second major argument advanced by Florida and the United States as amicus is, in essence, that the standard Terry analysis should be modified to license a "firearm exception." Under such an exception, a tip alleging an illegal gun would justify a stop and frisk even if the accusation would fail standard pre-search reliability testing. We decline to adopt this position.
Firearms are dangerous, and extraordinary dangers sometimes justify unusual precautions. Our decisions recognize the serious threat that armed criminals pose to public safety; Terry's rule, which permits protective police searches on the basis of reasonable suspicion rather than demanding that officers meet the higher standard of probable cause, responds to this very concern. See 392 U. S., at 30. But an automatic firearm exception to our established reliability analysis would rove too far. Such an exception would enable any person seeking to harass another to set in motion an intrusive, embarrassing police search of the targeted person simply by placing an anonymous call falsely reporting the target's unlawful carriage of a gun. Nor could one securely confine such an exception to allegations involving firearms.
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