For the first time, U.S. drivers killed in crashes in 2015 were more likely to have used drugs than alcohol, according to a new study. The study found 43% of drivers tested in fatal crashes in 2015 had used a legal or illegal drug, compared with 37% who showed alcohol levels above the legal limit, Reuters reports. Among drivers who died in crashes who tested positive for drugs, 36.5% had used marijuana, while 9.3% used amphetamines. The report was released by the Governors Highway Safety Association and the Foundation for Advancing Alcohol Responsibility, a nonprofit funded by distillers. "People generally should get educated that drugs of all sorts can impair your driving ability," said Jim Hedlund, a former official at the National Highway Traffic and Safety Administration, who wrote the report. "If you're on a drug that does so, you shouldn't be driving." National Council on Alcoholism and Drug Dependence, Inc.