If you dont conceal your weapon, can you be charged with a concealed weapon?

I am a police officer who is an avid 2nd amendment advocate. Even though I am a cop, I still keep a valid firearm permit since I could be fired at anytime for anything. A fellow officer asked me a question that has left me perplexed every since. His question was "If you find someone with a pistol on his person, in open view, and is not causing a disturbance or anything; and he does not have a concealed weapons permit. Is he doing anything illegal?" At first I said that he would be charged with having a concealed weapon without a permit, however when I thought about it, the weapon was not concealed, so that charge will not fit. I am researching my code books trying to find out what a person could be charged with but as of yet I have not found any. Be advised that I live in Mississippi. We are a pretty conservative state but we dont have a gunslinger law. I went on a call one evening at a chinese restaurant where there was a gentleman with a 44 magnum draped across his chest. He had a valid CCW from Tennessee however the permit allows for a CONCEALED weapon only. I asked him to conceal the weapon and he did, but I dont know of a law on the books that would have allowed me charge him with anything. I would appreciate any thoughts on this. Personally I think that everyone should be allowed to open carry as long as the weapon is made safe and holstered. I know that if someone saw someone open carrying that they would most likely call the police however, even if I saw them with an open carry weapon but were not showing any signs of violence, I wouldnt be able to do anything to him, nor would I want to.

Just to clarify something, just because a guy has a badge, does not make him an expert in ever facet of the law. I would have been glad to ask the city attorney about this however I spent a lengthy lunch break on the carpet in front of my chief while he told me that I needed to keep my questions to myself because the last inquiry I made to the city attorney, left me with a vague answer to my question and a bill for his services in my chiefs mail box. I carry around firearm permit applications with me in my patrol car so that people I talk to have no excuse for not getting a permit.
I spoke to the shift captain today and he told me that the proper charge would be a concealed weapons violation. I asked him how that was and he told me that even in a holster, it is considered concealed. I told him I didnt think that was legal and he told me that it may not be, but its the charge that they use. I have seen many people charged with offenses that didnt even exist, but they didnt know any better so they just plead guilty and paid the fine. And as to the knowledge and experience of law enforcement supervisors, just because they have a butter bar on their collar, doesnt mean that they are inteligent or well versed in the law. Try actually reading some police reports and you will find that a lot of cops cant spell, much less enforce only the actual laws that are on the books. I really appreciate all of your responses. I have yet to encounter someone open carrying other than the gentleman at the chinese restaraunt. If I ever do encounter someone open carrying, I will make sure that he is legit, and then send him on his way. Reguardless of the law, it is best to conceal because dut to the increasingly liberal state of mind that our country remains in, even a safely holstered weapon has become a reason for alarm. However most of the alarmed will pray for their neighbor to have a gun, when the sh-- hits the fan.