In my personal experience...The overpriced "detox" crap simply didn't do the trick...IDK if its specific to the one I bought a couple times but you have to drink it basically on your way to the test - the timing has to be just perfect...So I ended up projectile vommiting it all out on my way into the p.o.'s office bc my body didn't agree with that nasty sh but luckily I didnt get tested that time....I tried it another time and it didnt work either but I didn't use it for weed that time so maybe there's hope for you? In general my friends who used it and didn't fail for any drugs - basically failed anyway bc it came back as diluted...So maybe your'e better of drinking 6 gallons of water? save $50. Oh and did I mention those drinks make you feel like ABSOLUTE HELL for a couple days? My recommendation is substitution - no risk there unless youre having an observed screen - then you just gotta learn all the tricks