I'm not sure what DNA has to do with determining whether someone is under the influence; however, I do know that the government - federal, state, and local - are just itching to get a comprehensive DNA database of everyone in the country; in NY now, even people who are convicted, or plead guilty to, a class B misdemeanor - just slightly worse than a reckless driving ticket - are forced to give a DNA sample that goes into the NY and federal databases.