(a) A person who by virtue of his or her employment by a public entity does home inspection work for that agency shall not be required to be registered under this subchapter if the home inspections are conducted:
(1) Solely for the benefit of that entity; and
(2) For no compensation other than the employee's salary.
(b) This subchapter shall not apply to:
(1) Any person holding a valid registration, certificate, or license issued by the state if the person's activity is limited to the activity authorized by his or her registration, certificate, or license;
(2) A person who inspects his or her own home; or
(3) A public entity that inspects its residential units with its own personnel specifically trained for the home inspection.