18 months after implementation of the PFA, monthly pretrial supervision populations had increased 38%, while pretrial jail populations decreased 10% during the same period.

Overall, jail populations decreased by ~ 1,000 people while pretrial supervision populations increased by ~ 7,700 people.

Comparison of September 2022 to March 2023 (pre-PFA) vs. September 2024 to March 2025 (post-PFA)
Source: Loyola's Center for Criminal Justice analyses of monthly average daily jail population data provided by the Illinois Department of Corrections' Jail and Detention Standards Unit and obtained from the Lake County and Cook County jails, plus pretrial supervision populations from AOIC & OSPS. Pretrial supervision populations include those in the Cook County Sheriff's Electronic Monitoring program. Only counties/jails with complete data reported are included.Get the data