In the trial of any case involving the compliance of an owner or caretaker with a provision of this chapter requiring the treatment or vaccination of livestock, a person may not attempt to prove that the action was taken by a person other than an authorized representative of the commission.

Acts 1981, 67th Leg., p. 1404, ch. 388, Sec. 1, eff. Sept. 1, 1981.

Acts 2021, 87th Leg., R.S., Ch. 849 (S.B. 705), Sec. 16, eff. September 1, 2021.