When I went to college, my dad gave me some excellent advice. He said "I know you're going to drink, so if you do, stick to beer. You don't know what people put into mixed drinks" This was before date-rape drugs - he was just talking about alcohol content.
I followed his advice, and it served me well. Not that I never drank too much, but I didn't drink to the point of getting sick or putting myself in dangerous situations, and often found myself carrying home and/or cleaning up after friends who had tried the "Hairy Gorillas" or even innocuous-seeming Strawberry Daquiris. (Another bit of advice for the ladies: high heels + icy Northern winters + excessive drinking = disaster)
The whole "zero tolerance" concept is pointless - why not promote sensible drinking - allow 3.2 or regular beer and discourage hard liquor (including mixed drinks, shots, shooters, punch, etc.)
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