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Legal Weed Means Tougher DUI Laws in Washington

When Washington voters legalized marijuana last month, they also accepted a new legal standard for toking and driving. Just as .08 percent is a Washington driver’s limit for blood alcohol content, five nanograms per milliliter of blood is their new limit for active THC, marijuana’s psychoactive component. In most recreational users, active THC will drop below that threshold within two to three hours of using marijuana. But among the heaviest users, active THC levels may never drop below five nanograms, …

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