Well, I posted that on another forum and here is what I got from one guy:

Not to long ago a man went into his old doctor’s office to get his medical records to take to his new doctor. Will he was wearing a shoulder holster in the open.
When he checked in with the receptionist she seen he was armed with a weapon. She tell’s the office manager who gets the nurses to start clearing the waiting area and call the police.

Will they get the waiting area and office cleared and the police swat team shows up. They go in and have they guy get down on the ground and cuff him and take him into custody.

Will after talking to him for over 4 hours they let him go and told him not to wear his shoulder holster in public again.

The whole time the man was not threaten any one or acting funny. When the police came into the office waiting area he was reading a book.

The state of Missouri has a open carry law this was a year or two before the CCW was pasted.

The police even said he was legal to carry that way after it was done. But they did it this way because they did not know what he was going to do with it so they had to check it out as if he was going to do something with the weapon.

They man later told the news he knew he was in the right.
But said he also did every thing the police asked him to do and did not resist them any way for he had lived in a state that had a CCW law and knew what to do and not to do.
Somehow we'd have to bring the cops around before trying the open carry idea. Either that or overwhelm them with litigation every time some innocent gun-toter got popped (another civil rights tactic).