; (B) performs services for a program on a contractual basis; (C) is a school resource officer; or (D) is a school security guard. (6) Protection and advocacy system The term protection and advocacy system means a protection and advocacy system established under section 143 of the Developmental Disabilities Assistance and Bill of Rights Act of 2000 ( 42 U.S.C. 15043 ). (7) School resource officer The term school resource officer means a sworn law enforcement officer who— (A) is assigned by the employing police department to a program; (B) is contracting with a program