marijuana driving simulation

Study: No Correlation Between THC Detection and Driving Impairment

“In the largest trial to date involving experienced users smoking cannabis, there was no correlation between THC (and related metabolites/cannabinoids) in blood, OF [oral fluid], or breath and driving performance. … The complete lack of a relationship between the concentration of the centrally active component of cannabis in blood, OF, and breath is strong evidence against the use of per se laws for cannabis.”