Dumb sign since only law abiding will follow it and the cops never need to due to overriding State law.
It helps when I answer the door holding my 1911.
Maybe when they created these laws, and the liberal retard news like CNN were talking about how shootouts will ensue when you allow concealed carry, this was a way for those that had concerns or fear (Starbucks and other gay establishments) a way out?
So you create a state wide law but you allow the local beatnik college coffee shop the ability to post this sign so that they feel safe, since they after all have safe zones and a terminal with a direct line to the police, so no one needs a gun.