Cannabis is always an option.
Passing Drug Tests by Kenn A. Biscranium
I'm not sure if it's cool to put plugs out there. Not trying to sell anything (mods) just want to help.
This book was written by a friend of mine. Being that my occupation is in the health, my friend is on the money. Basically, exercise, keep your body clean of preservatives, lots of water, maybe some creatine if you want, no special drinks just physiology.
Screw that spice crap! don't worry about the feds, or staties, just worry about taking your medicine/Cannabis, if it helps, and keeping your pee clean.
Oh and make sure you have a good source if you live in a non-mmj state. Pay for the high grade if you can find it.
In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot.