The Impact of Cannabis Decriminalization and Legalization on Road Safety Outcomes: A Systematic Revi

The Impact of Cannabis Decriminalization and Legalization on Road Safety Outcomes: A Systematic Review, in American Journal of Preventive Medicine

key takeaway: It's complicated. "Increased cannabis positivity may reflect changes in cannabis use; however, it does not in itself indicate increased impaired driving. Subgroups impacted by medical and recreational legalization, respectively, likely explain opposing findings for fatal collisions."