Depends on the state. In reality though, the only "protection" those laws provides is a sign. Violating that law has varying penalties if caught but if a person is intent on shooting someone illegally they aren't going to care so it's more of a feel good measure than actual protection. Places like government buildings/courthouses/concerts etc have laws in place like that too but the difference is they have screening for weapons at the door and armed security/police present to put teeth and enforcement to itI thought private businesses could refuse weapons in their establishments? Or does state rule override that?