a good rule   (quote)

"...if your job involves a steering wheel, great heights, carrying a suitcase containing nuclear launch codes, machinery that may casually remove a limb, or, for the love of God, driving a bus full of adorable school children, it’s best to find another job. Because you cannot, in good conscience, drink while working under those circumstances. For all its benefits, being lit doesn’t improve your motor skills, depth perception or sense of balance. The last thing you want to do is kill someone or lose a hand, because ... they have the wrong kinds of bars in prisons, and it’s nearly impossible to execute a proper kegstand with only one hand."
 -Modern Drunkard Magazine