JonMc
Striker
It isn't a particularly strong argument against it. You'd expect people in all professions to avoid going to work under the influence of drugs (including alcohol). Here comes your problem... you were using cocaine and weed staying in your system for extended periods of time as an argument against those drugs whilst ignoring the fact that drugs staying in your system and having an influence on your are very much distinct.
Not under the influence. Not at all. I don't care if he/she is under the influence or not. I wouldn't trust a doctor who takes coke to make a diagnosis on my family. At all.