Stop and frisk

A brief, non-intrusive, police stop of a suspect.  The Fourth Amendment requires that the police have a reasonable suspicion that a crime has been, is being, or is about to be committed before stopping a suspect.  If the police reasonably suspect the person is armed and dangerous, they may conduct a frisk, a quick pat-down of the person’s outer clothing.   See Terry v Ohio, 392 US 1, (1967).