A San Antonio congressman got popped at the airport security checkpoint with a handgun in his carry on a few years ago. He introduced legislation to change the offense and it was passed a few years ago. Texas Code now reads...

(e-1) It is a defense to prosecution under Subsection (a)(5) that the actor:
(1) possessed, at the screening checkpoint for the secured area, a concealed handgun that the actor was licensed to carry under Subchapter H, Chapter 411, Government Code; and
(2) exited the screening checkpoint for the secured area immediately upon completion of the required screening processes and notification that the actor possessed the handgun.
(e-2) A peace officer investigating conduct that may constitute an offense under Subsection (a)(5) and that consists only of an actor's possession of a concealed handgun that the actor is licensed to carry under Subchapter H, Chapter 411, Government Code, may not arrest the actor for the offense unless:
(1) the officer advises the actor of the defense available under Subsection (e-1) and gives the actor an opportunity to exit the screening checkpoint for the secured area; and
(2) the actor does not immediately exit the checkpoint upon completion of the required screening processes.

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Smith & Wesson beat four aces