I think they shouldn't lump it in with alcohol. Further research needs to be done, I agree that someone who medicates alot will be affected less as they are used to the high.

It's a schedule 1 drug here in the states so nobody wants to do a study.

Some articles I've found.
Marijuana And Actual Driving Performance

DUI Marijuana: Does Marijuana Impair Driving? - Arizona DUI Laws Attorney Lawyer Phoenix DUI Drunk Driving Defense Extreme Penalties In Scottsdale

Peace :smokin: