(a) A person who performs emergency services for a participating department shall present to the participating department head a certification of physical fitness by a qualified physician.
(b) If a participating department provides membership to a person who performs support services under Section 862.0025, the participating department head shall assign a person to perform support services if the person:
(1) does not present an acceptable certification under Subsection (a); or
(2) will only perform support services for the department.