I use urineluck 4.0 synthetic Urine, I have never failed a test. Just heat it up in the microwave before you leave, verify the temp of the urine on the gauge, then put the heat pack on it and put it in your underarmor. When they have you go in to bathroom whip out the bottle very quietly and pour it in the cup. Cap the empty bottle up and put it back in your drawers and walk out and hand them the synthetic piss. It has worked for every single piss test I have taken, and my friends have passed using it too. We have had a 100% pass rate thus far. Practice a few times at home w/o heating it.
Sometimes with probation, they will actually watch your penis while urinating. If this is the case you had better start taking Niacin vitamin and burning lots of fat (extreme cardio and high rep weight lifting) as a precautionary measure. Drink a lot of water and intake a lot of protein and creatine and Avoid fatty foods. About 7 -10 days before the test stop working out, keep taking extra fluids, protein, and niacin vitamin. Some even suggest a teaspoon of white vinegar a day, but it tastes nasty. At about 4 days prior to the test I begin intaking fatty foods heavily. This will let the fat store up again in your system. The introduction of fat back to your system should aid in bonding any remaining THC so you do not piss it out on the test day. Especially since your so close, the method should work. I had been smoking heavily on couchlock smoke and I used this method with only 13 days to spare and it worked. Granted my metabolism is fast and I have a small percentage of body fat. If you are over average body fat, you need to give more time. Someone mentioned earlier, but make sure you do not use the first piss of the day and piss in the tiolet for a second or two before hitting the cup.