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After legalisation, the percentage of Canadian adults who used cannabis increased by less than 2%. At the same time, the amount of moderately injured drivers with blood-THC levels over 2ng per millilitre more than doubled.
According to researchers, these numbers suggest that people who already used cannabis may have relaxed their attitudes towards driving while stoned since legalisation in 2018, despite new laws enforcing road-side cannabis testing. Researchers caution that the presence of THC doesn’t necessarily mean that a road accident was caused by cannabis, especially at concentrations less than 5ng per millilitre. However, the largest increase in THC presence was observed among older drivers, whose motor-skills may be more severely impaired by the drug than their younger counterparts.
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