Yeah me and gutshot were just discussing this.
If a courthouse has any state office other than those associated with court proceedings, then they have to allow open carry of ONLY a firearm, no other weapons.
Offices associated with court proceedings would include;
Circuit and district clerks
Driver's licensing(yes i'm serious about this one)
Even in the ones that allow it, you still can only go into the state offices other than those listed and the adjoining hallways.
So the justice centers are COMPLETELY off limits as they will not house other state offices.
Tread carefully on this, I only know of one courthouse that you can open carry in and I forget which one it is, I just know one exists.
You can never open carry into a detention center of any kind.