Cannabis is basically the new abortion or 2nd Amendment. Seems like most Americans are evenly split on the topic with opinions bordering on religious fervor, with each side grasping on to bits of scientific evidence to support their opinion.
It's funny people are having a conniption regarding my assumptions that (1) half the faculty use weed, (2) a minority use hallucinogens, and (3) our UDS dates are given in advance. Even if my assumptions about faculty are correct:
(1) As pointed out above, the proportion of cannabis use is about equal or less than that reported in Medscape. If it makes you feel better, half my faculty are militantly against cannabis, one puff means your stimulant or benzo is revoked. The other half, though, would rip me if I ever diagnosed a patient with "cannabis use disorder, mild."
(2) We have a sizaeble faculty. So hallucinogen use, probably equals that of the population, or less. I don't follow faculty around, I don't know when they last used hallucinogens, the 1960s or yesterday? Who's to say they don't have their own cash shrink prescribing for them?
(3) Of course UDS dates are given in advance, just like anyone else who isn't a professional athlete. USADA doesn't jump out of the bush with unannounced blood tests. And no where did I say/guess that faculty are using cannabis or hallucinogens daily or heavily. UDS are generally useless anyway, as most substances pass within 1-2 days. Hence, the OP's original point about being aggrieved by their program switching to hair samples unannounced.