I highly doubt there is no record of a car accident of someone being high, because I'm sure it's happened before in a world of 6 billion. I also watch the show cops and the cop pulled a guy over for driving recklessly and tested him for Marijuana, and the guy tested positive.
A drug test doesn't show what you've done int he past hour, or the past 12 hours for that case. They test from 1 day to a week usually, and even if they do 12 hours he could have smoked anytime in the past couple hours, and by now he would be sober.












