ok, here's the secret. it will sound a little nuts, but if the test is that important...you will probably agree to try anything. but this is a tried and true method, used at the very highest stages of athletics.
get your buddy's piss and make sure he is clean of all drugs himself, make sure of this! empty the piss into an unrolled condom. attach a small straw like tube about 7 or so inches in length to the condom which is closed off otherwise. insert the condom into your anus (no joke) and run the small straw under your nuts. find a way to pinch it shut, so that the urine does not run out of the tube. now, when you go to take your test, you can simply undo the straw and the piss will flow freely from the condom due to pressure (which you can control) and also gravity. you can run the straw under your cock so that you can appear to be holding your own dick. now, to anybody watching (and the docs/military men who wathc don't usually watch that closely) it will look like the piss is coming from your dick. finish up, put your pants on and your done. now, you passed the first part and your clean urine will pass the next. and also, the temp of the urine will be perfectly 98 degrees or so due to it being in your own ass. it works, believe me.
dj-