Cannabis and Driving Study Casts Doubt on Zero-Tolerance Limits for THC

People using a driving simulator showed no signs of impairment a day after they smoked cannabis, though they still tested positive for THC, its main psychoactive component, a recently-published paper says. The research has implications for laws and workplace rules that require no trace of THC, which Scott Macdonald, a retired professor at the University of Victoria, calls “not scientific.” “I consider it one of the biggest myths about cannabis, that there are 24-hour hangover…

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Author: Patrick Cain, Global News