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Marijuana use involved in more fatal accidents in Colorado

16.05.2014

The proportion of marijuana-positive drivers involved in fatal motor vehicle crashes in Colorado has increased dramatically since the commercialization of medical marijuana in the middle of 2009, according to a study by University of Colorado School of Medicine researchers.

With data from the National Highway Traffic Safety Administration's Fatality Analysis Reporting System covering 1994 to 2011, the researchers analyzed fatal motor vehicle crashes in Colorado and in the 34 states that did not have medical marijuana laws, comparing changes over time in the proportion of drivers who were marijuana-positive and alcohol-impaired.

The researchers found that fatal motor vehicle crashes in Colorado involving at least one driver who tested positive for marijuana accounted for 4.5 percent in the first six months of 1994; this percentage increased to 10 percent in the last six months of 2011.

They reported that Colorado underwent a significant increase in the proportion of drivers in a fatal motor vehicle crash who were marijuana-positive after the commercialization of medical marijuana in the middle of 2009. The increase in Colorado was significantly greater compared to the 34 non-medical marijuana states from mid-2009 to 2011.

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The researchers also reported no significant changes over time in the proportion of drivers in a fatal motor vehicle crash who were alcohol-impaired within Colorado and comparing Colorado to the 34 non-medical marijuana states.

Stacy Salomonsen-Sautel, Ph.D, who was a postdoctoral fellow in the Department of Pharmacology, is the lead author of the study, which is available online in the journal Drug and Alcohol Dependence. Christian Hopfer, MD, associate professor of psychiatry, is the senior author.

Salomonsen-Sautel said the study raises important concerns about the increase in the proportion of drivers in a fatal motor vehicle crash who were marijuana-positive since the commercialization of medical marijuana in Colorado, particularly in comparison to the 34 non-medical marijuana states. While the study does not determine cause and effect relationships, such as whether marijuana-positive drivers caused or contributed to the fatal crashes, it indicates a need for better education and prevention programs to curb impaired driving.

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Other researchers from the School of Medicine who are authors of the study are Sung-Joon Min, Ph.D, Joseph T. Sakai, M.D., and Christian Thurstone, M.D.. The study was funded by the National Institute on Drug Abuse and the National Institute on Alcohol Abuse and Alcoholism.

Faculty at the University of Colorado School of Medicine work to advance science and improve care. These faculty members include physicians, educators and scientists at University of Colorado Hospital, Children's Hospital Colorado, Denver Health, National Jewish Health, and the Denver Veterans Affairs Medical Center. The school is located on the Anschutz Medical Campus, one of four campuses in the University of Colorado system. To learn more about the medical school's care, education, research and community engagement, visit its web site.

Mark Couch | Eurek Alert!
Further information:
http://www.ucdenver.edu

Further reports about: Abuse Drug Health Medicine accidents marijuana

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