Study Reveals Over 40% of Deceased Drivers in Fatal Crashes Tested Positive for THC
A recent study shows that over 40% of drivers involved in fatal crashes tested positive for THC, highlighting ongoing public health concerns related to cannabis use and driving safety, even after legalization.
Recent research presented at the American College of Surgeons Clinical Congress 2025 in Chicago sheds light on the ongoing public health concerns regarding cannabis use and driving safety. The study analyzed autopsy records from Montgomery County, Ohio, between January 2019 and September 2024, focusing on 246 drivers who died in motor vehicle crashes and were tested for THC, the psychoactive compound in cannabis.
The findings revealed that more than 40% of these drivers tested positive for active delta-9-tetrahydrocannabinol (THC), with blood levels significantly higher than those typically associated with impairment. The average THC blood concentration was 30.7 ng/mL, far exceeding the legal thresholds in most states, which range from 2 to 5 ng/mL. This indicates recent cannabis consumption at the time of the fatal crash.
Interestingly, the rate of THC-positive tests remained consistent over the six-year period, with no significant change before or after the legalization of recreational cannabis in Ohio in 2023. The prevalence was 41.9% overall, with yearly rates from 25.7% to 48.9%. These findings suggest that legalization has not reduced the likelihood of drivers testing positive for THC after fatal accidents.
Lead researcher Dr. Akpofure P. Ekeh expressed surprise over the high blood THC levels, emphasizing that these results point toward recent rather than residual use. He highlighted the importance of public health messaging, advocating for people to treat smoking marijuana similarly to alcohol—namely, avoiding driving after consumption.
The study underscores the dual challenge of balancing recreational drug legalization with road safety. The authors stress that while cannabis legalization aims to reduce criminal penalties and improve access, it also necessitates increased awareness of the potential dangers associated with driving under the influence.
This research provides critical insights into the ongoing risks associated with cannabis use and driving, emphasizing that public safety measures and education should be prioritized to mitigate these dangers.
Source: https://medicalxpress.com/news/2025-10-deceased-drivers-motor-vehicle-positive.html
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