Driving under the influence of booze and weed combined fell by smaller amounts, while stoned driving alone fell by even smaller -- essentially negligible -- numbers.
As SAMHSA notes, motor vehicle crashes are the No. 1 cause of death among 16- to 25-year-olds in the United States. So naturally, any reduction in DUI rates among that age group is welcome.
The data also weaken an argument by opponents of marijuana legalization. From 2002 to 2014, voters approved medical marijuana laws in 15 states and approved recreational weed in four more. Legalization opponents have warned that loosening pot restrictions would lead to more stoned driving. But as the numbers above show, it appears that hasn't happened, at least not among young adults.
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Correction: The drunk driving data was released and analyzed by SAMHSA, and published by the CDC