The impact of marijuana decriminalization on California drivers

Drug and Alcohol Dependence
Robin A PolliniJohn H Lacey

Abstract

The liberalization of marijuana laws has led to concerns that such changes will increase "drugged driving" and crash-related mortality. California decriminalized marijuana effective January 1, 2011; we examine the impact of this change on marijuana-involved driving. We used laboratory testing from roadside surveys and the Fatality Analysis Reporting System (FARS) to assess impacts on weekend nighttime drivers and fatally injured drivers, respectively. We calculated marijuana prevalence (measured by laboratory-confirmed delta-9-tetrahydrocannabinol [THC] in roadside surveys and cannabinoids in FARS) and compared corresponding 95% confidence intervals (CI) to identify statistically significant changes post-decriminalization. We also conducted multiple logistic regression analyses to determine whether the odds of marijuana-involved driving increased significantly after controlling for potential confounders. There was no statistically significant change in the prevalence of THC-positive driving among weekend nighttime drivers (n=894) in 2012 (9.2%; 95% CI: 6.3, 12.2) compared to 2010 (11.3%; 95% CI: 8.5, 14.0) or in the adjusted odds of testing positive for THC (adjusted odds ratio [AOR]=0.96; 95% CI: 0.57, 1.60). In contrast, we f...Continue Reading

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Citations

Jan 29, 2016·Journal of Addiction Medicine·Jane Carlisle Maxwell, Bruce Mendelson
Apr 10, 2016·Accident; Analysis and Prevention·Megan E SlaterRalph W Hingson
Jul 20, 2016·Analytical Chemistry·Jung-Rok LeeShan X Wang
Nov 7, 2016·Health Promotion Practice·Ashley Brooks-RussellSheana Bull
Jun 24, 2017·American Journal of Public Health·Jayson D AydelotteCarlos V R Brown
Feb 13, 2018·Journal of Ethnicity in Substance Abuse·Jennifer M WhitehillEmily Flom
May 14, 2017·The Journal of Primary Prevention·Eduardo RomanoJohn H Lacey

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