More Colorado Drivers in Fatal Car Crashes Testing Postiive for Marijuana

A new study funded by the National Institute on Alcohol Abuse and Alcoholism (NIAAA) and the National Institute on Drug Abuse (NIDA), shows an increased number of marijuana-positive Colorado drivers involved in fatal motor vehicle crashes since Colorado’s legalization of medical marijuana in 2009. A similar increase was not seen in the 34 states that did not have medical marijuana laws when this study was conducted. During the same time period, there was no change in the number of alcohol-impaired drivers in fatal motor vehicle crashes in either Colorado or the 34 then non-medical marijuana states.
Although this study did not determine a cause and effect relationship between the marijuana use and the vehicle accidents, research shows that both alcohol and marijuana impair driving. The authors suggest that these findings underscore the need for enhanced education about the dangers of driving under the influence of drugs, including marijuana. For information on drugged driving, go to

For a copy of the study (published online April 23), go to

A separate study conducted by researchers from the University of Massachusetts Amherst School of Public Health and Health Sciences and University of Washington pediatrics department found that underage college men have a high prevalence of driving under the influence of marijuana because they don’t view it as harmful. The researcher noted that more efforts are needed to combat the belief that driving after using marijuana is safe.

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