Terry v. Ohio

Why This Case Matters

There is no better place to begin than Terry v. Ohio. Before 1968, the Supreme Court had never recognized a constitutional standard allowing an officer to briefly detain someone based on less than probable cause. Officers either had sufficient grounds to make an arrest, or they did not. That approach left officers with few constitutional options when they encountered conduct that strongly suggested criminal activity but fell short of probable cause.

Terry changed that.

In a single opinion, the Supreme Court recognized that the Fourth Amendment permits a limited investigative detention based on reasonable suspicion. It also authorized a limited protective frisk for weapons when an officer reasonably believes a person is armed and presently dangerous. Nearly every Supreme Court decision addressing reasonable suspicion over the last half-century traces its roots to Terry.

The Facts

On October 31, 1963, Cleveland Police Detective Martin McFadden, a veteran officer with thirty-nine years of experience, observed two men repeatedly walking past the same store, looking into the display window, continuing down the block, turning around, and repeating the process. After each pass, the men met briefly on the corner before separating and doing it again. A third man later joined them for a short conversation before walking away.

Detective McFadden believed the men were "casing" the store in preparation for an armed robbery. He approached them, identified himself as a police officer, and asked for their names. Unsatisfied with their responses and concerned for his safety, he conducted a limited pat-down of Terry's outer clothing. During that frisk, Detective McFadden felt a handgun in Terry's overcoat pocket. A second weapon was recovered from one of Terry's companions, and both men were charged with carrying concealed weapons.

The case reached the Supreme Court on a fundamental constitutional question: Does the Fourth Amendment permit an officer to briefly detain a person and conduct a limited frisk for weapons without probable cause to arrest?

The Decision and Its Impact

The Supreme Court answered that question yes—but only within carefully defined constitutional limits.

Writing for the Court, Chief Justice Earl Warren recognized that police officers are often required to make quick decisions in situations where criminal activity appears to be unfolding but probable cause has not yet developed. The Fourth Amendment, the Court explained, does not require officers to simply walk away from suspicious conduct until enough evidence exists to justify an arrest. At the same time, the Court made clear that stopping a person and conducting a frisk are both searches and seizures governed by the Fourth Amendment.

To balance those competing interests, the Court announced a new constitutional standard. An officer may briefly detain an individual when the officer can point to specific and articulable facts which, together with rational inferences drawn from those facts, reasonably justify the intrusion. If the officer also reasonably believes the person is armed and presently dangerous, the officer may conduct a carefully limited frisk of the person's outer clothing for weapons.

Just as important, the Court rejected the idea that an officer's "inchoate and unparticularized suspicion or 'hunch'" could justify a stop. The Fourth Amendment demands objective facts capable of judicial review, not unsupported intuition.

Terry fundamentally changed Fourth Amendment law. For the first time, the Supreme Court recognized that the Constitution permits a limited investigative detention based on less than probable cause. It also established the two concepts that continue to anchor the doctrine today: reasonable suspicion must rest on objective facts, and officers are permitted to draw rational inferences from those facts based on what they observe.

Key Supreme Court Language

Chief Justice Warren wrote:

"And in making that assessment it is imperative that the facts be judged against an objective standard..."

The Court then explained the governing inquiry:

"Would the facts available to the officer at the moment of the seizure or the search warrant a man of reasonable caution in the belief that the action taken was appropriate?"

The Court announced the language that has become the foundation of reasonable suspicion jurisprudence:

"...specific and articulable facts which, taken together with rational inferences from those facts, reasonably warrant that intrusion."

The Court noted that an officer’s training and experience are a factor to consider in the reasonableness analysis:

“And in determining whether the officer acted reasonably in such circumstances, due weight must be given, not to his inchoate and unparticularized suspicion or ‘hunch,’ but to the specific reasonable inferences which he is entitled to draw from the facts in light of his experience.”

These passages continue to appear in Supreme Court opinions nearly six decades later because they define the constitutional standard created in Terry.

Before This Case

Before Terry, the Supreme Court had not recognized a separate constitutional standard authorizing a brief investigative detention based on less than probable cause. Although officers routinely investigated suspicious behavior, the constitutional authority to briefly stop and frisk a person without probable cause had not yet been defined.

After This Case

An officer may briefly detain a person when specific and articulable facts, together with rational inferences drawn from those facts, create reasonable suspicion that criminal activity is afoot. If the officer also reasonably believes the person is armed and presently dangerous, the officer may conduct a limited frisk for weapons.

Looking Ahead

Terry created the doctrine, but it left many questions unanswered. How much suspicion is enough? Can officers rely on information from informants? How should courts evaluate a series of facts that appear innocent when viewed one at a time? What limits exist on the scope and duration of a Terry stop?

Those questions would shape the next six decades of Fourth Amendment law. The Supreme Court's next reasonable suspicion decision, Sibron v. New York, issued the same day as Terry, demonstrates that while the Court recognized a new investigative tool, it was equally committed to enforcing constitutional limits on its use.