I had to take a pre employment Screening.. just the other day and was searching around on the internet ways to come up clean in less than 48 hours... I read up on everything from synthetic urine, to using others urine, to the diluting method and detox drinks.. I personally went to GNC and bought this detox drink because it was cheap. it was about twenty dollars because it was about to expire. It was QCarbo Clear with the big Vitamin pills. anyways... I smoked about twenty hours before my test, it was stupid I know but didnt expect to get the job, It was the day before I only took about 3 hits of some Killer buds. I followed the steps.. Drink 20 oz of water.. wait 20 min... drink the Detox Drink and take all five vitamins.. wait 20 min.. drink one more glass 20 oz of water. thats all I did. i didnt drink anymore or less water and it was on an empty stomach, which they said was recomended.. I passed the test. Dilution..obviously, from what i have been reading on these posts.. but when you dilute.. and you dont know much about this stuff like me, you have to be careful cuz its detected obviously.. so to cover the dilution u just take watever vitamins is needed to hide the fact that your diluting, Vitamin B2 ( Riboflavin ) and creatine Monohyrdate.. maybe some salt.. all this is debatable I know,, but I just wanted to throw this out there that Qcarbo Worked for me... I also want to note that I passed this test on the Second time Around.. The first time they sent me, I drank ALOT of Cranberry juice the morning and night before the first test, and was constantly pissing clear, I wasnt informed on how to Dilute properly obviously so my results we Negative/Diluted. so watever was in the detox drink I drank had hidden the dilution which was what my goal was...