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The next time police force you off the road, they may want more than your driver’s license; they may want a sample of your saliva. A practice call “Stop and Swab,” in which law enforcement check points are used to ...

Drivers in Fort Worth, Texas, last week faced a so-called “voluntary” roadblock, where police and federal contractors asked for samples of their breath, saliva and blood. The stops are part of a government study trying to determine the number of ...