And now there is a law in Oklahoma that says employers can't ban guns in employees vehicles :-)
This is a basic dispute over what rules you can impose on your own private property.
It's about corporate privlidges vs. individual Rights.
I happen to strongly agree with the new Oklahoma law, yet I've already admitted to breaking my company's rules.
But as of right now at my company in Texas they are completely entitled to make those rules as a condition of entering their property, and I break those rules at my peril.