I'm no cop, but he never seemed drunk to me in the interviews I've seen. Just 'eccentric'. I wouldn't be surprised to learn he smokes a little herb here and there, but neither takes away from his natural personality. People are MORE like their 'true selves' with a little chemical influence.
And well said dub and 670, I agree with all your thoughts and I think you both provided very well-written and well-thought out views.