John W. Terry v. State of Ohio
392 US 1, 20 L Ed 2d 889, 88 S. Ct. 1868

Facts

A police officer observed Terry and two other men repeatedly walking past and peering into a local store. The officer, a 39 year veteran, believed that the individuals were engaged in extremely suspicious behavior and were probably "caseing a job." He approach the individuals and asked for their names. After receiving a mumbled response, the officer spun Terry around a patted down his jacket uncovering a gun. He then patted down the other two suspects, uncovering a gun on one suspect, but not on the other. The officer confined his activities to a pat down of the outer layers of clothing.

Question

Does a stop and frisk qualify as a search of seizure protected under the Fourth Amendment?

Does a stop and frisk, lacking probable cause, violate the suspect's rights under the Fourth Amendment?

Holding

"We merely hold today that where a police officer observes unusual conduct which leads him reasonably to conclude in light of his experiences 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 inquires, 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. Such a search is reasonable under the Fourth Amendment, and any weapons seized may properly be introduced in evidence against the person from whom they were taken."

A stop and frisk is clearly a search and a seizure.

Reasoning

The Court felt that the "all or nothing" approach, requiring a warrant and probable cause, to any type of search was inadequate to deal with the realities of police work. They decided that it was likely that an officer could develop a reasonable suspicion that a suspect was armed and dangerous long before the officer would have probable cause to arrest such an individual. As a result, the court felt that it would be unreasonable to prevent an officer from taking necessary measures to ensure his safety and the safety of other in the area.

However, the Court pointed out that the taking of such actions must be based on specific and articulable facts, a simple hunch would not be sufficient. Furthermore, the scope of the frisk must be strictly tied to and justified by the circumstances which made such a frisk necessary. Additionally, the Court pointed out that they still hold the police must obtain a warrant whenever practically possible.