According to the Supreme Court opinion in Terry v. Ohio, involving the stop and frisk of a citizen on the street to investigate a robbery:
I. A police officer may in appropriate circumstances approach a person to investigate possible criminal behavior even though there is no probable cause to make an arrest.
II. When an officer is justified in believing that the individual whose suspicious behavior he is investigating is armed, the officer may conduct a limited search for weapons.
III. An officer must be absolutely certain in believing that the individual whose suspicious behavior he is investigating is armed before conducting a limited search for weapons.
IV. In determining whether the officer acted reasonably in conducting a stop and frisk, weight must be given to unparticularized suspicions and hunches as well as specific inferences based on the officer's experience.

Question

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The Supreme Court in Terry v. Ohio held that a police officer may stop and frisk a person if they have reasonable suspicion of criminal activity (I) and may conduct a limited search for weapons if they believe the person is armed (II). The officer does not need to be absolutely certain (III), and the decision must be based on specific inferences, not just hunches (IV).

According to the Supreme Court Opinion in Terry V