A large study by U.S. highway safety regulators found that more than half the people injured or killed in traffic crashes had one or more drugs, or alcohol, in their bloodstreams.

Also, just over 54% of injured drivers had drugs or alcohol in their systems, with tetrahydrocannabinol (THC), an active ingredient in marijuana, the most prevalent, followed by alcohol, according to the study published by the National Highway Traffic Safety Administration.

Although the study authors say the results can’t be used to gauge drug use on the roads nationwide, they say the high number of drivers, passengers and other road users with drugs in their systems is concerning.

Study details: https://www.npr.org/2022/12/13/1142598789/drivers-crashes-drugs-alcohol-nhtsa-study