drink gallons of water till you piss clear..piss clear 4-6 times take a vitamin and piss till it gets a touch of yellow...then hope youre in a room where theyre not watching you piss and put 2 drops visine in the cup of piss...not sure if this works anymore or if they can test to see if you did this anymore...my dad was a truckdriver and his labor union used this trick...i used it when i applied to walmart and i passed..i had smoked up to the day before starting to drink the gallon of water.