Tex. Agric. Code § 161.102
Immediately after pronouncing that an animal has died from anthrax, as evidenced by a clinical or postmortem examination, a veterinarian shall prepare and submit to the commission or a laboratory approved by the commission:
Acts 1981, 67th Leg., p. 1402, ch. 388, Sec. 1, eff. Sept. 1, 1981.