Passing a drug test is simpler than most people think. Whenever you urinate, you excrete anything that you have ingested. It’s not easy to make anything that goes into your body whenever it comes out. Whenever you grow your hair, your body puts in it whatever you put into your body. You literally are what you eat. This applies to your hair, urine, saliva, and even your skin. Luckily, no one takes skin grafts to test you for drugs. All of the other ways that you can get tested are relatively easy to pass.