• Robert G Morris, Michael TenEyck, J C Barnes, and Tomislav V Kovandzic.
• Program in Criminology, University of Texas at Dallas, Richardson, Texas, United States of America.
• Plos One. 2014 Jan 1;9(3):e92816.

BackgroundDebate has surrounded the legalization of marijuana for medical purposes for decades. Some have argued medical marijuana legalization (MML) poses a threat to public health and safety, perhaps also affecting crime rates. In recent years, some U.S. states have legalized marijuana for medical purposes, reigniting political and public interest in the impact of marijuana legalization on a range of outcomes.MethodsRelying on U.S. state panel data, we analyzed the association between state MML and state crime rates for all Part I offenses collected by the FBI.FindingsResults did not indicate a crime exacerbating effect of MML on any of the Part I offenses. Alternatively, state MML may be correlated with a reduction in homicide and assault rates, net of other covariates.ConclusionsThese findings run counter to arguments suggesting the legalization of marijuana for medical purposes poses a danger to public health in terms of exposure to violent crime and property crimes.

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