Tex. Occ. Code § 1702.169
A commissioned security officer other than a person acting as a personal protection officer may not carry a firearm unless:
(1) the security officer is:
Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. Sept. 1, 1999.
Acts 2007, 80th Leg., R.S., Ch. 1048 (H.B. 2101), Sec. 1, eff. September 1, 2007.