My brother is 14 years old, and confronted me about his physical. His friend told him about how his physical went, he (his friend) said he didnt have to piss in a cup or anything drug related. He also said that you don't have to do the urine test until age 16+. I'm really not sure about this and dont really remember. My brother hasnt smoked in close to a week and doesnt have one scheduled yet, but he wants to know if he can start smoking again or if there is a urine test. Any help/information on the age for urine tests is greatly appreciated. Thanks GC.