Why do the detectives sometimes wear their shields upside down?

Some eagle-eyed viewers have noted that certain scenes feature our heroes wearing their shields upside down, which would seem to be in direct contradiction to the uniform code. Once again, we go straight to Bill Clark for the answer. According to Bill, the shields are only upside-down during outdoor cold weather scenes. The badgeholder is designed to fit into a suit jacket or shirt-pocket lapel so that it appears right side up, but with an overcoat it's trickier. Instead, you have to clip it onto the outside of the coat, and the clip, for whatever reason, is designed in such a way that the shield hangs upside down. No disrespect intended; that's the way they're made.  more