My school, you sign a consent form to "have the bag thrown" at anytime.
1) They reserve the right to hand you the cup and say "now, please"
2) They are permitted to get hair samples to test as well
Since i will also be doing my clinicals at the same hospital i work at now, they reserve the right to random test me as a student, and as an employee, by hair or urine.
Not to mention the LTC place i do part-time work at random tests as well.
Even if i weren't tested at the rate i am (hey i'm GOOD at hitting that cup now!!
) i still wouldn't even attempt it. The consequences aren't even worth the risk. :stone