That is happening, but it is also both a function of a crumbling system and a bit of desperation of the system to hire people, whether they are necessary or not. The system does not really care about the drug use as much as it cares about whether whatever the factor, you can or cannot be manipulated because of it. The caveat of that being though that the system used to function on that basis, something that I am increasingly witnessing is no longer the case. What we are really living through right now is a kind of civilizational event horizon where, e.g., one society/culture has no remaining knowledge of what something really was for or how it was really used or what systems created it, even as they still use or worship it or perform certain rituals simply out of repetition and custom.
A rather good example of this process is the whole "space race" where the Germans pioneered space travel technology, which ended in a kind of collapse of the whole knowledge base to the point that the USA was hitching a ride on Russian rockets just to get to an aging space station, and where space travel had to essentially be rediscovered by SpaceX, etc. I don't think people quite understand what happened in that 1955-2010 period where the "advanced society" of today stumbled upon the ancient technology of the 1955-1960s when men with straight edges and graphing paper put men on the moon and brought them back home and couldn't figure out how exactly they did it … something that has still not been replicated.