I worked with a gal who was in a custody battle with her ex-, was on WIC (Women and Infant Children), foodstamps and Idaho Housing. She smoked weed every day. She knew if she got dinged, at work, on the pee test, she'd lose her kids, her house and her job.
Did not stop her. I just don't see a reason to risk anything at all, for an illegal, momentary high.
A guy who I like a whole lot, had to do his test and when he came back he told her "You're next."
She went pale and stumbled her way to the bathroom, where they were administering the test. She told them her name, they looked it up and she was not on the list. Pranked!
She chased that guy all over the shop, trying to hit any part of him she could reach. She was shaking and pale, from the fear and anger. I have an idea... stop smoking pot and all that stress will go away, like magic!