I’ve often dreamed about doing one of those before and after driving tests, to show the impairment caused by alcohol, for cannabis. I’ve always been sure that the THC users would be better drivers, relatively less impaired, that is, than alcohol users.
So, on a whim, I did a Google search and found a USDOT study that already beat me to the punch.
U.S. Department of Transportation
Ganja Driving
National Traffic Safety Administration
DOT HS 808 939
Marijuana, Alcohol and
Actual Driving Performance
July 1999
Quoted from the conclusion section, referring to the impairment caused by smoking weed, etc.:
“not been shown to extend into the area that can rightfully be regarded as dangerous or an obviously unacceptable threat to public safety. Alcohol present in blood concentrations around the legal limit (0.10 g/dl) in most American States is more impairing than anything subjects have shown after THC alone in our studies. As mentioned, medicinal drugs have had worse effects on psychiatric patients’ driving performance in other studies employing the same test procedures.”
