Wis. Stat. § 302.36

The sheriff, jailer, or keeper of a jail shall establish a prisoner classification system to determine prisoner housing assignments, how to supervise and provide services and programs to a prisoner, and what services and programs to provide a prisoner. The prisoner classification system shall be based on objective criteria, including a prisoner’s criminal offense record and gender, information relating to the current offense for which the prisoner is in jail, the prisoner’s history of behavior in jail, the prisoner’s medical and mental health condition, and any other factor the sheriff, jailer, or keeper of a jail considers necessary to provide for the protection of prisoners, staff, and the general public.