I took a gamble and bought the kit, not expecting it to work, but figured it was worth a shot because if it did, I could get a life changing job and it would pay for itself if it worked on my first paycheck. It WORKED. I used the original formula and it worked well enough without the “day of test” shampoo/clarifier a few days later. There was the pre employment test then they hit me with a surprise test the day I was meant to start. I still passed despite smoking the week in between. I did 7 washes to rid multiple substances. The mouthwash isn’t as great for certain things (hot for prescribed meds that the MRO will remove before it gets to employer) but just try be prepared for those or keep mouthwash with you to stall and blame alcohol.