Is Ritalin, Xanax, and Prebucol okay?
Seriously though, he's not asking for anything more than any committed employer wishs. However this is America and a lot of our people are anesthetized, legally and/or otherwise. Never mind that the operators of nuclear facilities hide little problems like leaks, releases, or hard data or executive branches of government illegally eavesdrop and infiltrate peace organizations or clergy molest their flocks and gain protection from the church...our workforce has to be clean.
In spite of the hyprocracy of our culture.
But like Big John said, hiring parameters set by fear and control can bite us back. I could've trusted my life in Carl Sagan's hands, certainly my intellect, and he admitted smoking pot everyday since receiving his doctorate. Cancer killed him, not his preferences.
But no matter how one's metabolic reaction to pot is, whether they can build a Swiss watch or carve an ice palace, landing a jumbo jet or rigging-down a giant elm calls for absolute precision and foresight with a team, imbibe can certainly wait for later, away from and finished with the task called for.
I both understand his desires to have a sharp person on board, but he's also limited his field of available and often very dedicated and skilled people.
I wish we would screen executives, politicians, and clergy as well. And pot is but one vice, perverts and pedophiles and liars seem to be easier to bring into positions of trust.