Yes, and my point is that poor job performance for whatever reason is grounds for losing one's job - thus if pot or any other thing caused job performance to suffer it could result in loss of a job. But not merely testing positive for a substance than can linger in the system up to a month. When it comes to pot, is it in any way fair to fire someone who smoked some week at a party two weeks ago and still tested positive despite not smoking at work and performing well? Methinks not.