According to a new study, drivers who test positive for THC do not possess a significantly increased risk of being responsible for a non-fatal motor vehicle accident.
For the study, researchers at the University of British Columbia compared the likelihood of crash responsibility in drivers testing positive for THC and/or other substances as compared to drug-free drivers over a six-year period (2010 to 2016).
As reported on by NORML, the state found that, “In this multi-site observational study of non-fatally injured drivers, we found no increase in crash risk, after adjustment for age, sex, and use of other impairing substances, in drivers with THC<5ng/ml. For drivers with THC>5ngml there may be an increased risk of crash responsibility, but this result was statistically non-significant and further study is required. … Our findings … suggest that the impact of cannabis on road safety is relatively small at present time.”
By contrast, authors reported, “There was a significantly increased risk for drivers who used alcohol, sedating medications, or recreational drugs others than cannabis.” Drivers who tested positive for the concurrent use of cannabis and alcohol possessed a higher risk of accident as compared to drivers who tested positive for alcohol alone