No shit. I remember test after test trying to prove a link between pot smoking and driving back in the 60s and 70s that failed again and again. Then they got one, and it's the only one referenced ever.
The interesting mention in the article is the combination of weed & drinking. I've noticed this since the disco days, all my friends were complete shit at driving after only a couple (I mean an actual 2) drinks. They'd weave and wobble all over the road until I made them pull over and ride shotgun. New West cops would always pull up and make sure that I was the driver, they knew I wasn't into getting wasted.
Of course, someone's going to demand "links", and I have to remind them they were called
microfiche and you find them at this thing called a {b]library[/b] not on
www.totllyobscurerightwingparaniosite.net