So you allow dopers to not only work for you, but lift things?
If I were an employer, then sure. If people want to huff aircraft wing membrane lacquer in the privacy of their own homes, that is their business. So long as they turn up on time and bright-eyed, it simply would not be my concern, and neither should it be.
I wouldn't even be bothered if they were eating spacecakes at home. Shooting up smack would probably trigger my disgust reflex, but the same principal applies: Are they doing the job, and are they doing it well?
I guess you (and others) would simply like to see such people sacked and put onto the street, artificially made destitute not by a substance, but by ignorant bosses with a puritanical attitude, and a system that's more broken than the mind of a terminal LSD addict?
(edit: Yes commentards, I know that LSD is rather low on the addictiveness scale.)