How Do You Test for Marijuana Impairment?
Colorado legalized marijuana and those over 21 years of age may purchase it from retailers. In this segment, we discuss how the testing is handled to determine driver impairment. As with alcohol, Colorado has a measurable level (limit) in place, which is five nanograms of tetrahydrocannabinol (THC)—per milliliter of whole blood. In 2016, approximately 30% of traffic fatalities involved an impaired driver, which translated into 196 deaths. Roughly 17% of those arrested for operating a vehicle under the influence involved marijuana. Surprisingly, 55% of marijuana users
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