Tested this way for drug court in Florida. Rinse mouth well with peroxide then used mouthwash Worked great for drugs but I got busted for alcohol. I tried telling them that it was the mouthwash, of course they said I had just switched my drug of choice to alcohol and that I was in denial of my alcoholism. I don't drink and had to drop out of drug court or go to a 6 mo. Residential treatment. Back to court to fight cultivation charge.