Here is the part of the statute: https://docs.legis.wisconsin.gov/sta...utes/175/60/16
175.60(16) Prohibited activity.
175.60(16)(a) Except as provided in par. (b), neither a licensee nor an out-of-state licensee may knowingly carry a concealed weapon, a weapon that is not concealed, or a firearm that is not a weapon in any of the following places:
175.60(16)(a)6. Any portion of a building that is a county, state, or federal courthouse.