Fig. 2From: Marijuana use in U.S. teen drivers: a comparison of a road-side survey of reported use and fluid tests for tetrahydrocannabinol (THC)Positive THC Test by Age Began Drinking and Amount Consumed. Figure Legend 2: The percent distribution of a positive THC test (shown in solid green) by age at which the adolescent driver began drinking and number of drinks consumed in an average week, National Roadside Survey, 2013–2014Back to article page