Sec. 451.001.  DISCRIMINATION AGAINST EMPLOYEES PROHIBITED.  A person may not discharge or in any other manner discriminate against an employee because the employee has:
(1)  filed a workers' compensation claim in good faith;
(2)  hired a lawyer to represent the employee in a claim;
(3)  instituted or caused to be instituted in good faith a proceeding under Subtitle A;   or
(4)  testified or is about to testify in a proceeding under Subtitle A.
Acts 1993, 73rd Leg., ch. 269, Sec. 1, eff. Sept. 1, 1993.