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Medical Marijuana Laws, Traffic Fatalities, and Alcohol Consumption

D. Mark Anderson, Benjamin Hansen and Daniel I. Rees
The Journal of Law & Economics
Vol. 56, No. 2 (May 2013), pp. 333-369
DOI: 10.1086/668812
Stable URL: http://www.jstor.org/stable/10.1086/668812
Page Count: 37
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Medical Marijuana Laws, Traffic Fatalities, and Alcohol Consumption
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Abstract

AbstractTo date, 19 states have passed medical marijuana laws, yet very little is known about their effects. The current study examines the relationship between the legalization of medical marijuana and traffic fatalities, the leading cause of death among Americans ages 5–34. The first full year after coming into effect, legalization is associated with an 8–11 percent decrease in traffic fatalities. The impact of legalization on traffic fatalities involving alcohol is larger and estimated with more precision than its impact on traffic fatalities that do not involve alcohol. Legalization is also associated with sharp decreases in the price of marijuana and alcohol consumption, which suggests that marijuana and alcohol are substitutes. Because alternative mechanisms cannot be ruled out, the negative relationship between legalization and alcohol-related traffic fatalities does not necessarily imply that driving under the influence of marijuana is safer than driving under the influence of alcohol.

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