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Crashes involving cannabis-impaired older adults higher after legalization


Following the legalization of cannabis in Canada in October 2018, drivers presenting to some British Columbia hospitals with moderate injuries were twice as likely to have over-the-limit tetrahydrocannabinol (THC) levels in their bloodstreams. This was discovered in a recent study led by Vancouver Coastal Health Research Institute (VCHRI) clinician-scientist Dr. Jeffrey Brubacher.

The legal THC limit for drivers in the country is less than two nanograms (ng) per millilitre of blood. Exceeding that limit may put a driver at risk of decreased judgement and driving abilities as THC can cause dizziness, memory loss and problems with concentration. 

Levels of THC above the two ng per millilitre limit were detected in blood samples of 3.8 per cent of the drivers reviewed in Brubacher's study before legalization. That number jumped to 8.6 per cent after legalization. Most of this increase occurred in males. 

The magnitude of this increase surprised Brubacher, as did the fact that drivers aged 50 and older were 5.18 times more likely to be part of this group. 

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SOURCE: Crashes involving cannabis-impaired older adults higher after legalization ( )
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