(a) A municipal or county department or private entity that employs or supervises first responders providing services for a municipality or county to which this chapter applies may adopt a policy authorizing a first responder who is employed or supervised by the municipal or county department or private entity and who holds a license to carry a handgun under Subchapter H, Chapter 411, Government Code, an unexpired certificate of completion from the department under Section 411.1883(d), Government Code, and the required liability policy under Section 179.053 to:
(1) carry a concealed or holstered handgun while on duty; or
(2) store a handgun on the premises of or in a vehicle owned or leased by the applicable municipality or county, or by the private entity if the handgun is secured with a device approved by the department under Section 411.1883(f), Government Code.
(b) A first responder employed or supervised by a municipal or county department or private entity may not engage in conduct described by Subsection (a)(1) or (2) unless the municipal or county department or private entity has adopted a policy under Subsection (a) that authorizes that conduct.