Traffic stops are used in police dragnets to check compliance with laws such as those requiring the use of seat belts or those forbidding the possession of narcotics.
In the United States, some people have objected that the tactic violates the U.S. Constitution, whose Bill of Rights contains a provision against unreasonable searches. Typically police must either have probable cause for a search or get a warrant from a judge specifying a particular individual by name or get a "John Doe warrant " with a specific description.
A recent court ruling declared that using drug-sniffing dogs at traffic stops to search for illegal drugs "compromises no legitimate privacy interest" on the grounds that "any interest in possessing contraband cannot be deemed 'legitimate'" [1]
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