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 effects that are measurable,” he said. “When people smoke cannabis, they’re only impaired for a short, short period of time. You could have THC in your bloodstream, but you’re not a danger.”

Researchers at the Toronto-based Centre for Addiction and Mental Health gave participants 10 minutes to smoke cannabis to a level they chose, then tested them in a driving simulator.

BY PATRICK CAIN GLOBAL NEWS
Read More here: globalnews.ca/news/6245267/cannabis-and-driving-study-thc/