Very wierd, Tbelle.
Back in the military, we had regular urinalaysis tests to ensure no one was doing drugs of any kind. The military has ZERO TOLERANCE for drug abuse. If you test positive you are automatically out. Needless to say, we heard a lot of stories and excuses about ways to get around the testing.
One really lame one was drinking aloe. Despite being very bitter, or so I was told, it did NOT flush your system out. There were also two popular excuses used to try and justify testing positive: eating sesame seeds makes you test positive and supposedly 2nd-hand smoke from people doing drugs. Of course, the command knew better. It would take like a bathtub full of sesame seeds to have someone test positive on a urinalysis. And supposedly, 2nd hand smoke doesn't do it either (not sure about that one).
In short, if you want to pass a urinalysis, people, STOP DOING THE STUPID DRUGS!!!