They will take a clipping of hair off your head to be tested it takes 2 to 3 days for the results. Do not waist you time or money to try to cheat it!!! Nothing works!!!! You can use every shampoo on the market every day for years and still fail the test! Bleach,tide,ect...... Ps if you shave your head it would look bad, like you have something to hide but if your bald they will take it from other parts of the body. The drugs are trapped in side of the hair shaft that's why you can't cheat it!!!