Drivers 50 and older were the injured group most likely to far exceed allowable THC levels while behind the wheel, Canadian researchers report in a new study that found more people overall seem to be driving high since recreational cannabis got the green light.
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When adult-use cannabis was legalized in October 2018, federal regulations spelled out the prohibited blood drug concentrations that would apply.
For THC and its related penalties, information from the federal government notes a straight summary conviction offence applies if THC per millilitre (ml) of blood is at or over 2 nanograms (ng), but less than 5 ng. The drug-alone hybrid
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