In Canada, impaired driving is the leading cause of criminal death and injury. With the recent legalization of cannabis in Canada, it now raises the question of how do we define and identify cannabis impairment while driving?

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Author Details


  • Asbridge, Mark, Jill A. Hayden, and Jennifer L. Cartwright. “Acute Cannabis Consumption and Motor Vehicle Collision Risk: Systematic Review of Observational Studies and Meta-Analysis.” BMJ 344 (February 9, 2012): e536.
  • Canada. (2019, January 8). Drug-impaired driving. Retrieved from driving/drug-impaired-driving.html
  • Cole, D. (2019, October 4). How Long Does Weed Stay In Your System? (Urine, Blood, Hair & Saliva). Retrieved from:
  • stay-in-your-system-urine-blood-hair-saliva-450eec0b501e Department of Justice. (2018, June 22). Impaired Driving Laws. Retrieved from
  • Government of Canada. (2016, December 12). Bill C-46: An Act to amend the Criminal Code (offences relating to conveyances) and to make consequential amendments to other Acts. Retrieved from
  • Government of Canada. (2018, June 22). Government of Canada. (2019, January 8). Drug-impaired driving. Retrieved from
  • driving/drug-impaired-driving.html Iversen, L. (2003). Cannabis and the brain. Brain, 126(6), 1252-1270. doi:10.1093/brain/awg143
  • Nathalie A. Desrosiers, Johannes G. Ramaekers, Emeline Chauchard, David A. Gorelick, Marilyn A. Huestis, Smoked Cannabis: Psychomotor and Neurocognitive Effects in Occasional and Frequent Smokers, Journal of Analytical Toxicology, Volume 39, Issue 4, May 2015, Pages 251–261,
  • RCMP. (2018, December 20). Impaired driving investigations - Royal Canadian Mounted Police. Retrieved from
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