Cops want to know who’s driving while stoned. Tests are being developed, but level of impairment after smoking weed is still hard to measure.

“The difficulty with [blood testing] is police typically need a judge’s approval for a search warrant, and then need a trained phlebotomist to draw the blood, a process that can easily take a couple of hours. By then, studies show, most of the THC in blood has already dissipated.”

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