The 2025 Assembly Joint Resolution 121 proposes an amendment to the Wisconsin Constitution regarding the custody of county jails and their inmates. It establishes that the county sheriff shall have custody of the county jail and its inmates, unless the county board of supervisors decides to delegate that authority to another public officer or entity. This amendment is based on previous rulings by the Wisconsin Supreme Court affirming the sheriff's inherent constitutional authority over jail custody.

To become effective, this proposed constitutional amendment must be adopted by two successive legislatures and ratified by the public. The resolution outlines the creation of a new section in Article VI of the Constitution and stipulates that it should be published for three months prior to the next general election, where it will be presented to voters for approval.