Drunk Driving Down; Drugged Driving Up AlcoholismBy Promises Behavioral HealthJuly 14, 2009A government survey found that the number of drunk-driving cases has fallen sharply over the last 30 years due to tougher laws and a shift in societal views on alcohol. However, a separate survey showed that for the first time, 16.3 percent of nighttime weekend drivers tested positive for drugs—mainly marijuana, cocaine, and methamphetamine.