When Can Police Set Up Roadblocks?
When police stop only "suspicious" cars at roadblocks, the stops may not be legal.
Sobriety checkpoints are a particular type of roadblock.
When Police May Stop Someone on the Street
A police officer's hunch that something is afoot is not enough.
The Difference Between a Police "Search" and a Police "Frisk"
A search is more extensive than a frisk--but the line can be hard to draw.