December 20, 2025
Highways and high times collide
Over 40% of Deceased Drivers in Vehicle Crashes Test Positive for THC: Study
Commenters say weed + wheels don’t mix, argue legalization didn’t help
TLDR: An Ohio review found 41.9% of drivers killed in crashes had active, impairment-level THC, and legalization didn’t change that. Commenters erupted: some say they constantly see people vaping behind the wheel, others question sample size and want population context—everyone agrees the “don’t drive high” message needs teeth.
A new Ohio study says 41.9% of drivers who died in crashes had active THC, averaging 30.7 ng/mL—far above typical state impairment limits (often 2–5). Legal weed didn’t change the rate. That was enough to set the comment section on fire. SilverElfin swears they see people “smoking and vaping at stoplights all the time,” and doesn’t buy that legalization had no impact, citing west coast vibes where public puffing feels way more common. iLoveOncall brought the gallows humor: “And what share of the remaining 60% were killed by the initial 40%?” Oof. Meanwhile jjice confessed it’s a “huge peeve,” saying their THC-using friends “have no qualms driving,” even on the job. Others tried to cool the takes: epistasis clarified the numbers are actual impairment-level THC, not just residue, and neoCrimeLabs asked for context—what percent of the general population would test positive? Some called the 246-driver sample “small,” but the authors say the high positivity held steady over six years and across legalization. The ACS Clinical Congress abstract isn’t peer reviewed yet, but the message is blunt: treat weed like alcohol—don’t drive. The meme-ification was instant: Don’t vape and valet, Highway, not high-way, and the eternal plea—call a ride
Key Points
- •Among 246 deceased drivers in Montgomery County, Ohio, 41.9% tested positive for active THC.
- •Average blood THC level was 30.7 ng/mL, exceeding typical state impairment limits of 2–5 ng/mL.
- •THC positivity rates remained consistent over six years (yearly range: 25.7% to 48.9%).
- •Legalization of recreational cannabis in Ohio in 2023 did not significantly affect THC positivity (42.1% vs. 45.2%).
- •Findings will be presented as an abstract at ACS Clinical Congress 2025; the research is not yet peer reviewed.