Drug Rehab and Police/social/medical Records?

Will going to drug rehab be on your medical/social/police record? I know my teen has smoked pot, and although we have spoken to him on several occasions about this, we continue to find evidence that he still is. He wants to be a fireman–and I know that he will never become one if he gets caught. Will sending him to rehab cost him a record that he won’t be able to overcome?