In my opinion, this guy could have been completely clean, and have the same accident. I will never believe that weed caused this accident. Coincidence...yes.<quoted text>George Peter Lynard for one that killed a driver in Nevada while driving under the influence of Marijuana (not alcohol and marijuana). Or check out Michigan V. Swift, another similar case. While I am not a librarian, those are two that I pulled off google real quick for you.
Marijuana doesn't impair you like that.
More importantly, marijuana stays in the system 30 days. He could have smoked marijuana two weeks prior, and it would still be in his system.
You'll never convinced me that marijuana caused the accident.