1 in 7 California drivers had drugs in their systems, survey finds By Wesley Lowery, Los Angeles Times California officials are warning against "drugged driving" after a statewide survey found drugs that can affect driving in one of every seven weekend nighttime motorists - nearly twice the number of those with alcohol in their system. The survey results, announced Monday by the California Office of Traffic Safety, found that 14% of drivers surveyed tested positive for driving under the influence of impairing drugs - both illegal and prescription - and 7.3% of drivers tested positive for driving with alcohol in their system. "These results reinforce our belief that driving after consuming potentially impairing drugs is a serious and growing problem," Christopher J. Murphy, director of the Office of Traffic Safety, said in a statement. The impaired driving survey included more than 1,300 drivers who voluntarily provided breath and/or saliva samples at roadside locations set up in nine California cities between 10 p.m. and 3 a.m. Friday and Saturday nights. Samples were tested for alcohol, THC and major illegal drugs, as well as prescription and over-the-counter medications that may adversely affect driving. Of the drugs found in the system of surveyed drivers, marijuana was most prevalent, with 7.4% of drivers testing positive. "Drugged driving poses a serious threat to public safety," Gil Kerlikowske, director of the Office of National Drug Control Policy, said in a statement. We look forward to working with California and other states to raise awareness about this important issue, and continue to take action to make our roadways safer.