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Romano E, Torres-Saavedra P, Voas RB, Lacey JH.
“Drugs and alcohol: their relative crash risk”.
J Stud Alcohol Drugs. 2014 Jan 13;75(1):56-64.
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Abstract
OBJECTIVE: The purpose of this study was to determine (a) whether among sober (blood alcohol concentration [BAC] = .00) drivers, being drug positive increases the drivers’ risk of being killed in a fatal crash; (b) whether among drinking (BAC > .00) drivers, being drug positive increases the drivers’ risk of being killed in a fatal crash; and (c) whether alcohol and other drugs interact in increasing crash risk.
METHODS: We compared BACs for the 2006, 2007, and 2008 crash cases drawn from the U.S. Fatality Analysis Reporting System (FARS) with control drug and blood alcohol data from participants in the 2007 U.S. National Roadside Survey. Only FARS drivers from states with drug information on 80 or more of the drivers who also participated in the
2007 National Roadside Survey were ed.
RESULTS: For both sober and drinking drivers, being positive for a drug was found to increase the risk of being fatally injured. When the drug-positive variable was separated into marijuana and other drugs, only the latter was found to contribute significantly to crash risk. In all cases, the contribution of
drugs other than alcohol to crash risk was significantly lower than that produced by alcohol.
CONCLUSIONS: Although overall, drugs contribute to crash risk regardless of the presence of alcohol, such a contribution is much lower than that by alcohol. The lower contribution of drugs other than alcohol to crash risk relative to that of alcohol suggests caution
in focusing too much on drugged driving, potentially diverting scarce resources from curbing drunk driving. (J. Stud. Alcohol Drugs, 75, 56–64, 2014)
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