Why It’s Crazy to Try to Set DUI Limits for Marijuana

Come New Year’s Day, Colorado’s pot shops will start selling legal, recreational weed, but there’s still a marijuana law that’s bugging pot advocates—the state’s new marijuana DUI law. Colorado passed a law last spring that presumes you’re too high to drive if you have five nanograms or more of THC per milliliter of blood, even though many experts say there is insufficient evidence to tie that level of THC to impaired driving. “We don’t have a consensus as to what levels of THC are consistently [...]

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