Changes in traffic fatality rates in the first 4 states to legalize recreational marijuana

6/22/20–Researchers have not yet conclusively determined if a state’s legalizing recreational marijuana is associated with traffic fatality rates. Two early studies reported no significant change in roadway deaths following legalization in Colorado and Washington, whereas a study including Oregon reported a temporary increase. A more recent study, including 2017 data, found a statistically significant increase in fatal crashes only after commercial stores opened, suggesting that the effect of legalization may take more time to observe. Read