How to mask Xanax to be able to pass a drug test?

Urine, hair, saliva,etc.. Test?
Check online or at your local head shop for "Detox" solutions.
Also I will recommend you this website  www.urinetestsolutions.com (follow the links for hair or saliva) also call them, they can help you.
Also Benzodiazepines (Valium, Xanax, Serax,etc) is additional drug class.

Get some golden seal, take it for a few days to detox your system. 24 hrs before the test, don't eat anything a drink a gallon of water. Drink about four more glasses when you go into take the test, and do it mid stream (pee in the toilet first, then fill the cup, then finish in the toilet). You're urine will be pure water, but it will be at body temp. So there's nothing they can do but pass you.