Detentions by Police
Police officers are sometimes entitled to stop people seemingly at random, as when roadblocks and sobriety checkpoints are involved. But they generally need a level of suspicion that lies somewhere between a hunch and probable cause in order to detain and question citizens. And they need more than that to search them.
A search is more extensive than a frisk—but the line can be hard to draw.
When police stop only "suspicious" cars at roadblocks, the stops may not be legal.
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