"The stuff" got through home tests when the cranberry detox I was doing failed, and passed a real lab test the next day with a 2nd bottle. Follow the instructions and check the product website for more details, but it's clear if you can follow directions.

Looks like it would be fun but I can't get the gun to calibrate, the cross-hairs are mostly off the screen no matter what I do. If I hold the gun very still & at an odd angle I can get the cross- hairs on the screen but can't control them, they jump around at slightest movement.