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Good question. This is something I should have addressed in the post itself. DWI checkpoints remain legal on the premise that intoxicated drivers pose an immediate threat to public safety. Those in possession of drugs are not necessarily wasted or dangerous, thus the Supreme Court could not rationalize the monumental invasion of privacy involved in stopping everyone on the road just to find a little pot, etc.

This was the only good 4th Amendment ruling handed down by the Court in recent memory. Of course DWI checkpoints remain, and often serve as a pretext to look for drug offenders.