heres the deal:...im going to be a lab rat for some bullshyt product. They are going to test anti-diarrea(SP?x10) all herbal pills on me and they going to pay me$800. But this sunday i have to get a screening, AKA piss test. Now, iv been of the grass for about a yr now, but i smoked only a joint with a buddy of mine before he went back to school, about 2 1/2 weeks ago. should i be clean? if not what can i do to flush my body?