An employer, labor union, or employment agency commits an unlawful employment practice if the employer, labor union, or employment agency retaliates or discriminates against a person who, under this chapter:
(1) opposes a discriminatory practice;
(2) makes or files a charge;
(3) files a complaint; or
(4) testifies, assists, or participates in any manner in an investigation, proceeding, or hearing.
Official text of the Texas Labor Code as published by the Texas Legislative Council.