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Roadblocks
Michigan v. Sitz, 496 U.S. 444 (1990).
Drunk driving roadblocks are constitutional as long as conducted
according to pre-set guidelines which limits discretion and
arbitrariness of officers involved with respect to which vehicles are
stopped.
Indianapolis v. Edmond, 531 U.S. 32 (2000).
Roadblocks conducted for purposes of drug interdiction are
unconstitutional since the purpose behind such roadblocks is
general crime control and not to take dangerous motorists off road.
Illinois v. Lidster, 540 U.S. 419 (2004).
Informational roadblock that sought the assistance of motorists in
the area of a hit and run fatality is constitutional.
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