TJ is wrong about masking and washing or cleaning hair, right about 1 product that is helpful. The way to beat a hair test is by using several methods to remove the THC metabolites from the hair not by masking and Aloe Rid Treatment is one of them. It's very hard to find.

Max, how old are you? Good job withh the AP classes.

Hair tests can go back about 90 days or 1 & 1/2 inches of hair. 3 sessions during that times can cause you to fail. They measure from the root out and hair grows about 1/2 inch per month.

Methods to remove the metabolites involve bleaching and redying the hair (the dye is to hide the fact you bleached it), using perms or straighteners, several comercial shampoos used for this such as Zydot, Toxin Wash (most are ripe offs but there is proof that these are some of the better ones) Paul Mitchell Cleanse 3, the Aloe Rid Treatment, and Malibu 2000.

Finally there is the a method that involves using vinegar and acne products that use 2% salicylic acid to soak the hair for 5-10 minutes then washing with Tide or other laudry detergent.

I've heard about using a baking soda paste then the detergent but I like the acids better.

There's a start. These methods are not 100% but can improve your chances greatly. A random hair test that allows little prep will be hard to beat so you would probably have to start treating your hair and quit for a while.

The search feature has more from me.