hello fellow pot heads i would like to share my information that ive gathered over the last few years of my drug test experience. first an foremost ive taken around 10 drug tests in my life an passed every1 of them.(knock on wood i got some more to do) some were random from my probo officer some were well know of before. as well all know Thc is stored in our fat so i have had a great advantage with that. i weigh 140lb an im 5'9. so i have very small amount of body fat obviously. every drug test ive taken was within 1 week of smoking.. yes 1 week. the least amount of time was 3 days. the most recent was 4 days with out smokin an i passed that test last week. all i did was drink some water before the test day then smack out a gallon or gallon an half of water on the test day no vitamin B for yellow or anything never had a problem with the water down piss. now before when i stated i passed a Random drug test i Passed that in 3 DAYS.. yes i smoked 3 days before it got a random drug test told the people i couldnt piss drank as much water as i could in a couple minutes at a foset an pissed an PASSED! i hope this helps you all out with your parnoia an anxiety over drug tests.. i now smile when i take a piss test even though i smoked that week!