I have a question that has probably already been covered before, but I can't find it anywhere. Some businesses where I live in Washington State have signs posted on the doors into the building that state you can't have firearms on the property, and/or show a picture of a pistol with a cross through it. I can't find a firearms law that says you can not bring a concealed pistol onto private property, and I am almost positive there isn't one. What I am wondering is if you could be arrested for tresspass just for entering a building with one of these signs posted. Up until today I had thought that the business owner or an employee had to ask you to leave before the police would do anything. Today though, after a discussion with some family members who also carry concealed, I am wondering if just entering a building with a sign posted, knowing that the owners don't want you to have a firearm would be a crime. Any information and sources where that information was found would be helpful.
Also, the Criminal trespass law I found for WA states "A person is guilty of criminal trespass in the first degree if he knowingly enters or remains unlawfully in a building." and "A person is guilty of criminal trespass in the second degree if he knowingly enters or remains unlawfully in or upon premises of another under circumstances not constituting criminal trespass in the first degree." So I guess part of the question is what "unlawfully entering" means and if that applies to "no firearms" signs.