Does having a "I support the police" sticker on your car (of various kinds) help during a traffic stop?

Sometimes you see people with a PAL (police athletic league) or X Location Police Officers Association sticker on their window or bumper. I assume they paid some sort of fee to the organization, and in return got the sticker. Now, I’m sure many people feel a strong motivation to support the local police. However, I wonder if an ulterior motive is to directly show their support to a police officer. Does having one of these stickers “help”? Has anyone ever been given favorable treatment on this basis?