If there's no rule... Then how can you break it?
Research the state law and make sure your office isn't located on a restricted property, or involved in a business that makes it prohibitive. Example: if you work in a courthouse building, there may be no policy because it should already be understood. Smart to leave it out of the employee handbook? No. Possible? Yes. Same as if your state prohibits carry in a bar.
If the state laws don't apply, and your employer's rules don't apply... Keep calm and carry on.
Research the state law and make sure your office isn't located on a restricted property, or involved in a business that makes it prohibitive. Example: if you work in a courthouse building, there may be no policy because it should already be understood. Smart to leave it out of the employee handbook? No. Possible? Yes. Same as if your state prohibits carry in a bar.
If the state laws don't apply, and your employer's rules don't apply... Keep calm and carry on.