Tex. Gov't Code § 76.0051
An officer is authorized to carry a weapon while engaged in the actual discharge of the officer's duties only if:
Added by Acts 1997, 75th Leg., ch. 1261, Sec. 29, eff. Sept. 1, 1997.
Acts 2005, 79th Leg., Ch. 255 (H.B. 1326), Sec. 5, eff. May 30, 2005.
Acts 2013, 83rd Leg., R.S., Ch. 93 (S.B. 686), Sec. 2.22, eff. May 18, 2013.