Guy at the liquor store said...
If they test for creatinine, then you will likely have lower than normal levels of it after flushing. This is going to be hard to explain, as it is a highly probable indication that you have been trying to flush your system to clean up your urine.
Alternating water with sports drinks though, can be a good solution. It can help to clean up the urine and to pass toxins faster, all while helping you to keep decent enough creatinine levels.
Increase Creatinine
The body naturally produces creatinine, and you can also buy supplements at most health food stores. Increasing the amount of creatinine in your urine may help with diluting various types of drugs in the system. For the best results, you do need to start about 48 hours before the test will take place. If you have a shorter window of time, it can be more difficult to do successfully. Keep in mind that many tests for drugs also will identify the level of creatinine present.
If it is spiking off the charts, it can be a red flag. However, you can always tell them that you are involved with using the supplement for a very strict diet and workout regiment. If you are in decent shape, this could be a believable story that will at least buy you some time before a second test is conducted.