In this chapter:
(1) "Emergency medical services personnel" means a person described by Section 773.003, Health and Safety Code, who is a paid employee of a political subdivision.
(2) "Firefighter" means a firefighter who is a permanent, paid employee of the fire department of a political subdivision. The term includes the chief of the department. The term does not include a volunteer firefighter.
(3) "Police officer" means a paid employee who is full-time, holds an officer license issued under Chapter 1701, Occupations Code, and regularly serves in a professional law enforcement capacity in the police department of a political subdivision. The term includes the chief of the department.