It's invasive, it's obviously demeaning, and it doesn't address the actual issue of impairment.
Urine tests are really limited in that they only look for five to nine substances.
But there are so many things that can impair a person, like fatigue, prescription drugs, what have you. The American Civil Liberties Union considers most workplace drug testing an invasion of privacy and a waste of money. Graham Boyd, director of the national ACLU's drug litigation project, points out that urine tests can be faulty and inaccurate. The drug testing industry claims that drug tests reduce accidents and improve productivity. But there's been no significant studies showing that drug testing has an appreciable impact on safety or productivity.