(a) This subtitle applies only to an employee of a participating governmental unit who is:
(1) a law enforcement officer who is certified by the Maryland Police Training and Standards Commission as a law enforcement officer; or
(2) a firefighter who is:
(i) a paid firefighter, as determined by the eligible governmental unit; or
(ii) a paid paramedic, as determined by the eligible governmental unit.
(b) This subtitle does not apply to an employee of a participating governmental unit who is a volunteer firefighter or volunteer paramedic.