More than 40% of drivers killed in motor vehicle crashes in one Ohio county tested positive for active THC, the psychoactive component of cannabis, according to a new study by the American College of Surgeons (ACS) .

Researchers reviewed coroner records from Montgomery County between January 2019 and September 2024 and found that 41.9% of the 246 deceased drivers tested positive for THC, with an average blood level of 30.7 ng/mL. That’s several times higher than most state-defined impairment limits, which range from 2-5 ng/mL.

“An average level of 30.7 ng/mL generally means those people must have consumed marijuana at some time close to driving,” said lead author Dr. Akpofure P. Ekeh, a professor of surgery at Wright State University. “This isn’t about residual use; it’s about recent

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