Terry stops allow a police officer to briefly detain someone if the officer has reasonable suspicion that the suspect is, or was recently, involved in criminality. An officer can conduct a Terry frisk if he has reason to believe the suspect is armed and dangerous.
The purpose of a Terry stop is to confirm or deny the officer's reasonable suspicion. Against that backdrop comes United States v. Arthur. Two black men wearing dark clothing robbed a Metro PCS store in Maine. Police responded to the silent alarm and attempted to find the culprits. About five minutes after the robbery, police found two black men wearing pea coats walking away from the scene. On their way, they saw no one else matching the suspects' description.