A favorite citation used by the marijuana lobby to promote the idea that marijuana doesn’t impair driving is one published in 2015 by the National Highway Traffic Safety Administration (www.nhtsa.gov/behavioral-research/drug-and-alcohol-crash-risk-study). And when the study is cited, the results are usually badly misquoted.
Los Angeles Times: “Good news (?): marijuana doesn’t increase the likelihood of car crashes.”
USA Today: “New study shows no link between marijuana use and car accidents.”
Reason: “Landmark study finds marijuana … READ MORE
Two articles on the effect of recreational marijuana commercialization on traffic fatalities reached opposite conclusions in the June 22nd 2020 issue of JAMA Internal Medicine. Readers should understand the effect of study design differences before concluding that marijuana can be commercialized without an increase in traffic fatalities.
Colorado politician Representative Ed Perlmutter introduced H.R. 1595 to the US House of Representatives on March 7, 2019. 
NORML (National Organization to Reform Marijuana Laws) held their annual conference in Washington, DC on July 23, 2018. Deputy Director Paul Armentano presented “The Influence of Cannabis on Psychomotor Performance and Accident Risk.”
Michigan is considering legalizing the recreational use of marijuana in next month’s election. Ross Jones of Detroit’s ABC affiliate WXYZ reported on his interviews of a number of Colorado leaders this week, asking if Colorado was less safe since legalizing marijuana in Colorado. I was one of his interviewees.