if you know when you're going in to do the test, drink tons of water before you go in and keep pissing...if it's clear you'll pass the test. I've done it lots of times...you can use something like "I've been dehydrated and I've been drinking plenty of fluids" if they bring up anything about it being clear...I went off on my probation lady once..."well what do you want me to do, hold it for a day then come in here and pee in that little cup for you?" best for sure way to pass a drug test...

it sounds like you'll be good though...you shouldn't have enough chemicals left in your body after this much time.