Which element is not required to justify a temporary detention?

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The key idea here is that a temporary detention (a Terry stop) must be justified by reasonable suspicion that the person is involved in criminal activity, based on specific, articulable facts. That requirement — reasonable suspicion grounded in concrete facts the officer can articulate — is what truly justifies stopping someone.

The statement that the stop must last for a brief duration isn’t a formal element used to justify the detention itself. Stops are described as brief because they are temporary, but the legality hinges on the reasonable suspicion supported by articulable facts, not on how long the stop lasts. In other words, the stop can continue longer if new reasonable suspicion develops; its legitimacy isn’t tied to a strict “brief” duration.

So, the element not required to justify a temporary detention is that the duration must be brief. The essential justification remains the presence of reasonable suspicion based on specific articulable facts.