Well, usually if you are high and drunk you get the spins, and no one should be driving under the influence of that. When i first posted "driving high makes you a better driver" it was partly a joke. I don't think driving under the influence of anything makes you a "better driver", but i must say if your an experience marijuana smoker driving under the influence is just like driving on the influence of nictoine for a cigarette smoker. It's not gonna effect your driving that much, but as you said its not good to drive under the influence of anything, and i agree with that 100%. Sorry about your sister. Just thank god it wasnt too severe.