One study has found that High Voltage Detox Shampoo does remove drug metabolites from the hair. Three other detox shampoo products were tested: Test Past Detox Shampoo, Stinger Detox Folli-Kleen, and Ultra Kleen Ultra Cleanse Hair Cleansing Shampoo and Conditioner. The hair samples tested came from regular alcohol drinkers. And as you know, alcohol is the most used drug. High Voltage Folli-Cleanse actually decreased the alcohol metabolite ethyl glucuronide by 73%. A decrease by that amount would be enough to pass a drug test.