A six-year analysis of more than 10,000 Canadian drivers involved in motor vehicle collisions suggests cannabis has edged out alcohol as the most common impairing substance detected through after-crash blood testing.
The National Drug Driving Study 2024, produced by the University of British Columbia, says researchers analyzed blood samples from drivers in British Columbia, Alberta, Saskatchewan, Ontario, Quebec, Nova Scotia, New Brunswick and Newfoundland and Labrador between 2018 and 2023.
