You have to understand a couple of things:

A). Drinking water in the days before a U/A is of no help. THC is NOT water-soluble unlike other types of drugs. Therefore, you cannot rid the body of THC by drinking copius amounts of water.
THC is fat-soluble. THC is stored in the fat cells and remain there until the fat cells are burned for energy. When fat cells burn, the stored THC metabolites are released back into the bloodstream. The kidneys filter the THC metabolites from the bloodstream and are deposited into the bladder for the eventual exit. The rate of filteration is unaffected by copius water consumption.
Drinking water is only helpful on the day of the U/A. Thats because the water consumption serves to dilute the THC metabolite concentration that is present in the bladder. You are NOT eliminating THC, but instead the THC metabolite concentration is "thinned-out" to where a urine sample could register below the cutoff thresholds of the drug screen (that is providing that the THC metabolite concentration is not too high). This dilution phenomena, however, is only temporary - once the fluids ingested had all been urinated out, the bladder is replenished with fresh THCA-laden urine, and thus the donor is right back to square one.

B). Exercise is only helpful if a person has weeks to prepare for a U/A. Exercising 3 days or less before a U/A can be detrimental. Thats because youre burning fat cells - which releases THC metabolites into the bloodstream and end up in the urine, as earlier pointed out. So for 3 days before a U/A, you want to curtail all fat-burning activities and be as dormant as possible until after the U/A. That way you wont be releasing a bunch of THC metabolites into the bloodstream, which will end up in the urine to be detected.

My PO insists everyone will be clean after 30 days of no use,
That P/O is dead wrong. The "30 day rule" does not apply to "everyone". Each persons body is different and metabolic rates vary from person to person. We've had posters here that still tested positive long after 30 days were up. Its not an uncommon thing. We've even had a couple of posters (MollylovesMary, for one) who still tested positive after 100 days of abstination.

As far as your wranglings with the P/Os accusations, thats something you need to take up with the attorney thats handling your case. You still have retained the services of an attorney, have you?

Probation drug testing is a real PITA. A person placed on probation has relinquished many of his/her rights, including the right to a fair drug test (yea, I know. thats a contradiction in terms). Because of this, there are really no rules in the game of probation drug testing. And unless you have very effective legal counsel, you may just have to put up with the antics of the P/O and tell your side to a judge - convince the judge one way or another that you have not resumed using cannabis and that youre very willing to take a blood test - even if you have to pay out of your pocket. Blood testing for drug use, however is not going to be cheap.

Which is the likely reason why your P/O wont test your blood. It sounds more like a question of economics on the P/Os part and is using the "blood tests are for DUI's only" excuse to mask the unwillingness to spend the money necessary to test blood. P/O's can be big cheapskates too.
Burnt Toast Reviewed by Burnt Toast on . Random Drug Testing I was wondering if anyone has any knowledge on my problem. I am on probation and have random drug tests. They waited 45 days to do a baseline test on me and ever since this PO has been on my ass accusing of being a liar and she says I have to be still using. My 1st test I was at 198 and was a chronic smoker, all day every day, so I imagine I was probably way higher back then. A this time she told me that I should have been clean in 30 days so she was going to monitor me closer. So she tests me Rating: 5