On June 12th, 2007. See this statement in context.
June 12th, 2007 / 10 a.m.
Chair, Drugs and Driving Committee, Canadian Society of Forensic Science
That's right. There is no correlation for drugs. There just isn't enough literature out there. But for alcohol it's 80 milligrams per 100 millilitres, and that's based on blood levels, not urine.
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