Terry v. Ohio
Overview
 
Terry v. Ohio, 392 U.S. 1
Case citation
Case citation is the system used in many countries to identify the decisions in past court cases, either in special series of books called reporters or law reports, or in a 'neutral' form which will identify a decision wherever it was reported...

 (1968), was a decision by the United States Supreme Court
Supreme Court of the United States
The Supreme Court of the United States is the highest court in the United States. It has ultimate appellate jurisdiction over all state and federal courts, and original jurisdiction over a small range of cases...

 which held that the Fourth Amendment
Fourth Amendment to the United States Constitution
The Fourth Amendment to the United States Constitution is the part of the Bill of Rights which guards against unreasonable searches and seizures, along with requiring any warrant to be judicially sanctioned and supported by probable cause...

 prohibition on unreasonable searches and seizures
Search and seizure
Search and seizure is a legal procedure used in many civil law and common law legal systems whereby police or other authorities and their agents, who suspect that a crime has been committed, do a search of a person's property and confiscate any relevant evidence to the crime.Some countries have...

 is not violated when a police officer stops a suspect on the street and frisks him without probable cause
Probable cause
In United States criminal law, probable cause is the standard by which an officer or agent of the law has the grounds to make an arrest, to conduct a personal or property search, or to obtain a warrant for arrest, etc. when criminal charges are being considered. It is also used to refer to the...

 to arrest
Arrest
An arrest is the act of depriving a person of his or her liberty usually in relation to the purported investigation and prevention of crime and presenting into the criminal justice system or harm to oneself or others...

, if the police officer has a reasonable suspicion
Reasonable suspicion
Reasonable suspicion is a legal standard of proof in United States law that is less than probable cause, the legal standard for arrests and warrants, but more than an "inchoate and unparticularized suspicion or 'hunch' ";...

 that the person has committed, is committing, or is about to commit a crime and has a reasonable belief that the person "may be armed and presently dangerous." (392 U.S.
 
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