A police officer may stop and question a person, short of arrest, if the officer has reasonable suspicion, as distinguished from probable cause to believe, that the person has committed a crime; and may make a brief frisk of the person for dangerous weapons if the officer reasonably believes that his personal safety so requires.
Commonwealth v. Hicks, 209 Pa. Super. 1, 223 A.2d 873 (1966).
Thomas P. Ruane,
Criminal Law Arrest,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol5/iss3/11