Texas Occupations Code - OCC § 901.606. Immunity from Liability

(a) A person acting in good faith who voluntarily reports or assists in the investigation of a report of an alleged violation of this chapter or who testifies or otherwise participates in an administrative or judicial proceeding arising from a report or investigation of an alleged violation of this chapter is immune from civil or criminal liability that might otherwise be incurred or imposed.

(b) A person who reports the person's own violation of this chapter or who acts in bad faith or with malicious purpose in reporting an alleged violation of this chapter is not immune from civil or criminal liability.