No Sir, I do not misunderstand the law. I deal with these laws daily all over the State.
Just as with bars, an officer is not able to carry where guns are posted as forbidden. If the officer is called there, then he/she can carry a sidearm inside.
Caddo Parish SO recently fired a deputy for going inside a bar with his sidearm without being called to the bar.
If an officer is making a random check for security, then carrying a firearm is tolerated.
Now for the real issue: There is no laws that forbid a person from carrying a gun into a convenience store but the store can forbid weapons, such as Circle K has done nationwide. Lowe's Building Materials also did this years ago but has since reversed their position on guns. If one goes inside a store where guns are forbidden, then they can ask you to leave. Yet cou cannot be charged with carrying a weapon inside the store. If you refuse to leave, then you can be charged with Entering & Remaining, among other possible charges.
A POST certified law enforcement officer does not have any more rights than a civilian citizen. He has powers of arrest but is limited to where he can go without being called there.
Would Circle K ask the officer to leave their store? No, but the stores are posted restricting guns and the officer could be asked to leave.
I work with these laws, courts, attorneys, law enforcement agencies and politicians all day long. seven days a week and have tangled with this issue before.
So what about cops on LSU campus or any school campus for that matter?