Yes, Texas is an employment-at-will state. However, you can't fire someone for being in a protected class, you can't fire them for refusing to do an illegal act, you can't fire them for making a worker's comp. claim and you can't fire them in violation of a contract of employment. Employment-at-will has limits and not firing someone for having a gun in the car is no more intrusive on one's personnel policies than the restrictions set out above. Employers can use a pretext and fire someone for having a gun, while claiming another motive. But those actions are not as easy to get away with as one might believe. (I've had clients learn that one the hard way.) Remember, contrary to popular belief and what lawyers learn in law school, you don't have to prove anything; all you have to do is make the jury believe it. (That's an over-simplification, but not by much.) Further, I personally favor a bill that would address this issue in a manner that keeps the existence of a firearm confidential, but that's just my opinion. (Charles Cotton)
I think if you were fired because you have a CHL as opposed to carying at work against stated work policy you should talk to a lawyer about it.