I'm sure you can pick other counties in the US which have either very high representation of THC users or very low representations. Without knowing how other counties score in terms of driver fatalities and THC, this is not really very useful.
To me it sounds like an effort to paint THC as big and scary. But in my experience living in a few large cities, weed is rare - but lots of people go out, drink, and drive home one or more times per week.
ScienceDaily goes even further by rounding up to 50% and burying the location halfway down the summarization.
"Nearly half of drivers killed in crashes had THC in their blood THC-impaired driving deaths are soaring, and legalization hasn’t slowed the trend. Date: October 5, 2025 Source: American College of Surgeons Summary: 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."
Unless they publish who funded the study, I'm skeptical that the alcohol industry might be involved. It's absolutely in their best interest to paint marijuana as the devil (and take attention away from alcohol).
Obviously nobody should be driving with any impairment, but people do - driving tired, texting, even talking to passengers and turning their heads to look at the passengers while they talk! (Really, why??? I see people doing this all the time.)