U.S. data has shown for the first time that drivers killed in crashes were more likely to be on drugs than drunk, with marijuana involved in more than a third of fatal accidents in 2015, a study released on Wednesday showed. Forty-three percent of drivers tested in fatal crashes around the country in 2015 had used a legal or illegal drug, topping the 37 percent who showed alcohol levels above a legal limit, according to the report by the Governors Highway Safety Association and the Foundation for Advancing Alcohol Responsibility, a nonprofit funded by distillers.