This section does not apply to officers, agents, or employees of this or any other state or the United States, or to law enforcement officers, authorized to carry concealed weapons or dangerous ordnance, and acting within the scope of their duties. This paragraph, to me, grants law officers the right to carry a weapon when ever they choose. On or off duty. Note it says nothing about the policy of the department to carry on or off duty, but that policy does change from department to department. Lets consider another angle of attack.
Many police departments do in fact let their officers carry weapons off duty.
Then you can use the following provisions. Of course, if you happen to be found not guilty and released from custody you will have lost some time at work, some money if you hired a lawyer and your dignity. He can arrest you again tommorrow. Again and again and again, until he disarms you. The weapon was carried or kept ready at hand by the actor for defensive purposes, while the actor was engaged in or was going to or from the actor's lawful business or occupation, which business or occupation was of such character or was necessarily carried on in such manner or at such a time or place as to render the actor particularly susceptible to criminal attack, such as would justify a prudent person in going armed.