[ARCHIVE ANSWER]
When they ask you if you are dirty, and you are, do not lie. Tell them before they test you. It gives them the opportunity to not run the test. Pay your probation costs in full, on time, every time. Keep your job. Simply call your PO. If you called the hotline, and your color was up, and tell her outright that you had smoked a bowl of weed over the
weekend. She won't like it, but you will sail through his probation without being violated.
This, of course, depends on whether your PO. is somewhat cool. If she is a real asshole, don't try this approach.
In a perfect world, people on probation and parole should be prescribed marijuana instead of punished for smoking marijuana. Ever wonder why it is so easy to get cannabis while in prison? The prison guards turn their heads and allow marijuana to enter the prisons because it calms down the population. No kidding.