PROSECUTORIAL DISCRETION: Milwaukee man with a concealed-carry permit shoots a robber in a store… but the store had a sign prohibiting weapons. The prosecutor made the right call. In Tennessee the signs have to be quite specific to have legal effect, but I don’t know about Wisconsin. The FAQ makes it seem that any language is okay so long as the sign is prominent.
Plus, from the comments: “Interesting that the shop with a ‘No Guns’ sign is the one getting robbed.”