By Laura Payton, Ottawa News Bureau Online Producer, April 25, 2017 

OTTAWA — Blood tests for THC are less accurate than those measuring alcohol in impaired drivers, experts say, raising questions about how police will enforce stiff new penalties when the government legalizes marijuana.

The government says it would introduce new penalties for driving while impaired by marijuana, ranging from a fine to up to 10 years in prison for the most serious cases. The penalties are to be based on the nanograms of THC found per millilitre of blood, also known as per se limits.

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