yo,,, jus drink about a gallon of water over the period of 3 hours the night b-for, and then the next day, just drink a gallon of water and piss aout 4 times b-for your test. then when you pee in the cup they give you, your piss will be clear so remember to take a thing of yellow food coloring and put about 1/2 a drop in the cup and you will pass without them being suspicious. i've passed every time and smoked up to the night before ,, it works