The risks of driving while impaired by drugs

Sustained efforts to reduce drunk driving are paying off. Although drinking and driving still result in avoidable tragedies, the numbers have been trending down.


A new layer of complexity was added to impaired driving regulations when cannabis became legal in October 2018. Despite the prevalent idea that cannabis-impaired driving is not as dangerous, the crash rate of cannabis-impaired drivers is:

Since legalization, penalties for cannabis-impaired driving have gone through rounds of changes, and as of now, a level between 2 and 5 nanograms per millilitre of blood will result in a maximum $1,000 fine. Penalties escalate for levels above that, and in cases when cannabis impairment is combined with alcohol impairment. Tests are conducted with an oral sample and refusal to comply also carries penalties.


As with alcohol, there are no hard and fast rules for how much you can consume and how many hours you need to wait before operating a vehicle. There are many factors at play, including the type of marijuana product consumed, tolerance levels and more.


Drug-impaired driving is also not limited to cannabis - over the counter and prescription medication can have adverse effects  on your ability to drive and doing so is subject to the same penalties as alcohol and cannabis-related offences.


When starting a new medication, ask your doctor or pharmacist about potential side-effects. Also try to take the first couple of doses on days when you don’t have to drive to see how it affects you. 


Whether it’s alcohol, marijuana or heavy prescription medication, your best bet is to avoid driving altogether and plan a safe ride home with a friend, taxi or public transportation.

Doing a lot of winter driving? Check out more safe driving tips.   



Madd – Cannabis and Driving


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