As a Texas peace officer you have essentially a complete exemption from 46.02, 30.05, & 30.06 criminal statutes for carry. I guess your employer could decide to fire you for violating their parking lot ban, which is contrary to Texas law even for non-LEO. Most folks will tell you that the company can get around the parking lot law by firing you for another reason since Texas (like 48 other states) is an "at will" employment state. Personally I call bull on this. The law is clear, you can keep your firearm in the car and your employer can not use that as a cause of action to fire you. So if they make up something else.... that's arguably a "tort" or maybe an implied contract violation that you can sue for. It's just that (as Chas. has said) there is no explicit civil remedy in the "parking lot" law. Maybe you can get a civil lawyer to take it up or maybe not.
My position (which I have backed up with my behavior) is that I will carry a handgun in my car whenever I am in Texas, despite my company's (unlawful) rule that I may not have said gun in my car in our parking lot. What is the Greek.... Molon Labe? Come and get it!!!!! I don't think our rinky dink "observe and report" mall cops are gonna open my car
