D.A.: No prosecution for John Bryson LOS ANGELES, July 3 (UPI) -- Former U.S. Commerce Secretary John Bryson tested positive for Ambien, but will not be prosecuted following two traffic collisions, Los Angeles prosecutors say. The Los Angeles County district attorney's office said Bryson will not be prosecuted for the alleged hit-and-run crashes in June because of insufficient evidence, the Los Angeles Times reported Tuesday. Tests did not show alcohol or controlled substances in his blood but he did test positive for Ambien, a sleep aid, prosecutors said in a memo outlining their decision not to file criminal charges against him. Bryson was found unconscious in his Lexus in Southern California June 9 after striking two vehicles. He suffered a seizure at the time of the crashes and resigned from office shortly after taking medical leave June 11. The district attorney's office memo indicated there were "low end of therapeutic levels" of Ambien in Bryson's system and a criminalist was unable to determine whether the drug was a factor in the collisions. Two doctors who treated Bryson said the crashes resulted from confusion following a seizure, the Times reported. "Based on doctors' opinions there is insufficient evidence to show knowing failure to provide personal information for hit and run," the memo said. The memo also concluded there was "insufficient evidence to prove driving under the influence." Before being appointed to the Obama administration Cabinet, Bryson had served as chairman, chief executive officer and president of Edison International, the parent company of Southern California Edison and as a director of The Boeing Co.