Nearly half of drivers killed in crashes had THC in their blood
American College of Surgeons
October 5, 2025
Over 40% of fatal crash victims had THC levels far above legal limits, showing cannabis use before driving remains widespread. The rate didn’t drop after legalization, suggesting policy changes haven’t altered risky habits. Experts warn that the lack of public awareness around marijuana’s dangers behind the wheel is putting lives at risk.
Key Takeaways
• In a review of 246 deceased drivers, 41.9% tested positive for active THC in their blood, with an average level of 30.7 ng/mL — far exceeding most state impairment limits.
• The high rate of THC positivity remained consistent over six years and was unaffected by the state’s legalization of recreational cannabis during the study period.
• Messaging around the dangers of smoking cannabis and driving needs to be stronger, authors argue.
