Washington Post - After states pass laws permitting medical marijuana, drivers in those states become less likely to test positive for opioids after fatal car accidents, a new study from Columbia University's Mailman School of Public Health has found.
Researchers analyzed federal crash data in 18 states over the period from 1999 to 2013. States that passed a medical marijuana law during this period saw a reduction in opioid involvement in fatal car accidents, relative to states without such a law. The reduction was greatest among drivers aged 21 to 40, the age group most likely to use medical marijuana where it's available.
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