(a) A security department acts as the security department of a private business if it:
(1) has as its general purpose the protection and security of its own property and grounds; and
(2) does not offer or provide security services to another person.
(b) For purposes of this subchapter, a hospital licensed under Chapter 241 or 577, Health and Safety Code, may provide security services to:
(1) buildings, grounds, and tenants located on the hospital's property or campus, regardless of who owns the building; and
(2) a parent entity or member entity of the hospital or hospital corporation, or an affiliated entity or business with whom the hospital shares common ownership or control.