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The hotel owner can not prohibit you from having a gun in your room. That room is your residence while you are staying there.

Your hotel room is your residence throughout the duration of your stay. They may be able to prohibit you from carrying in the lobby, but they can not prohibit you from carrying in your room.

Artilum may want to go back and re-read the law. 30.06 signs do not have to be posted at every entrance, they only have to be posted "conspicuously."