Voters last fall passed Initiative 502, allowing adults older than 21 to possess up to an ounce of marijuana. The measure, which took effect Dec. 6, set a driving-under-the-influence limit designed to be similar to the .08 blood-alcohol content for drunken driving -- 5 nanograms of active THC per milliliter of blood.
State toxicologist Fiona Couper told a legislative hearing in Olympia on Wednesday that the Washington State Patrol's toxicology lab has completed tests on all blood samples taken from drivers in December, and has started on samples from last month. She says there's no spike, but notes the law has only just taken effect.
Couper says that every year, about 6,000 blood samples from drivers are submitted to the lab. About 1,000 to 1,100 of those come back positive for active THC, with the average being about 6 nanograms.
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