State law does not require coroners to test deceased drivers specifically for marijuana use in fatal wrecks — some do and some don’t — and many police agencies say they don’t pursue cannabinoid tests of a surviving driver whose blood alcohol level is already high enough to charge them with a crime.
Marijuana is figuring into more fatal crashes overall. In 2013, drivers tested positive for the drug in about 10 percent of all fatal crashes. By 2016, it was 20 percent.
More drivers are testing positive for marijuana and nothing else. Of the drivers involved in fatal crashes in 2014 who tested positive for cannabinoids, more than 52 percent had no alcohol in their system. By 2016, it had grown to 69 percent.
https://www.denverpost.com/2017/08/25/colorado-marijuana-traffic-fatalities/
*
” In 2013, drivers tested positive for the drug in about 10 percent of all fatal crashes. By 2016, it was 20 percent.”
Meaning they smoked sometime in the previous 3 or 4 weeks.
They do not test for THC. They test for its metabolites which remain in your system for up to a month.
Wait a minute. You just said, “State law does not require coroners to test deceased drivers specifically for marijuana use in fatal wrecks — some do and some don’t.”
That means that no accurate figures can be generated. All these percentages can only be made up.