I am not sure but have been reasrching all day, apparently l hear it works with cranberry juice or gatorade about 32 oz and 2 packs shake well, follow up with 32 0z of water and urinate and test your urine prior to the test it supposed to last 8 hours in your system. If it was me I would test this process days before and get a conclusion on how it works. Good Luck! cause one minute weed is legal and then its not, its all done to keep people from working, hell our fore farther of this great nation smoked the piece pipe before stealing this land from the indians ya know what I mean lol??