” 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.
“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.”
Just one more thing that invalidates these figures. The only other place you can get away with experimental design this shoddy is in the greentard syndicate.