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Taking one toke of a joint is enough to lead to a traffic fine under rules rolled out ahead of the legalization of cannabis in Canada next year.

Drivers who smoke weed and don’t want to get caught legally impaired would need to wait at least several hours before getting behind the wheel, said Doug Beirness, senior research associate at the Canadian Centre on Substance Use and Addiction (CCSA).

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“There really is no amount of cannabis you can smoke and stay under a level of two (nanograms per millilitre),” he said in an interview from Ottawa.

The Alberta NDP introduced Bill 29 Tuesday to update the provincial Traffic Safety Act in response to federal legislation and pending changes to the Criminal Code of Canada. Use of recreational pot will be legal July 1.

Under Bill C-46, impaired drivers face a maximum $1,000 fine if their blood tests positive for two to five nanograms per millilitre of tetrahydrocannabinol (THC), the main psychoactive compound in cannabis.