)in which case did the supreme court rule that in addition to the suspicion required to justify a stop, the officer must have reasonable suspicion that the person stopped is ʺarmedʺ and ʺdangerousʺ before a frisk can be conducted?

The correct answer is Terry v. Ohio, 392 U.S. 1 (1968),

In this case, the Supreme Court ruled that a police officer can stops a suspect on the street and frisks him or her without probable cause to arrest if there is reasonable suspicion that the suspect is armed.

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