Marijuana Use While Driving in California

A study conducted for California’s State Highway Department found that on any given Friday or Saturday night, up to 7 percent of all drivers test positive for marijuana use. The 7 percent figure means that traces of marijuana was found in their blood, and does not mean that they were impaired to drive.

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Source:  Maia Szalavitz, “7% of California Drivers Test Positive for Marijuana, but Are They Impaired?,” Time, November 20, 2012.