Certainly something to check on. I've placed a call to verify whether property-owners can grant permission to anyone. Chapter 46, section 15 does list a lot of exclusions to 46.02, though as you note, none for "permission of property owner".
I just spoke with an attorney. ...
He did remind me that on private property the owner can grant just about anyone permission to OC (felons excluded) handguns.
I suggest seeking counsel of a different attorney, because this one doesn't know what the hell he's talking about.
There is no "with permission" exception to PC 46.02.
What's interesting is I also see no exception for employees who aren't security guards yet I see gunshop employees OCing in every gunshop I enter. While there are exceptions to 46.02 specifically for security guards, none of the openly-armed guys I've seen selling guns behind the counter meet the requirements set forth. Section b of 46.15, chapter 46 discusses security guards and requires they meet subdivision 5. Following are the relevant parts:
None of the gunshop employees I've seen meet (b) "wearing a distinctive uniform" and as far as I know don't hold security-officer commissions. In fact, every employee I've ever bothered to ask has said they OC because they have permission from the owner to OC.
(2) is on the person's own premises or premises under
the person's control unless the person is an employee or agent of
the owner of the premises and the person's primary responsibility
is to act in the capacity of a security guard to protect persons or
property, in which event the person must comply with Subdivision
(5) holds a security officer commission issued by the Texas Private Security Board, if:
(A) the person is engaged in the performance of the person's duties as a security officer or traveling to and from the person's place of assignment;
(B) the person is wearing a distinctive uniform; and
(C) the weapon is in plain view;
Any thoughts as to how those employees are violating 46.02 and yet aren't fulfilling b.5 of 46.15 Non-Applicability?