I knew I had a experimentation and quit 35 days before. However 5 days before I experimented myself and I was positive. I knew I was close to the cut off and short on time so I bought the 3 day detox. After day one I was experimenting negative. This is a great product that for sure makes a difference. Be smart, give yourself plenty of time, and follow the directions on the product you order. These products are top notch and do the job. I would also recommend the synthetic urine, it works too!