Over the past 22 years, the impact on Illinois’ prison admissions and population of those on Mandatory Supervised Release (MSR) returned to prison as technical violators or with new prison sentences has varied considerably, the result of multiple factors, including changes in the number of prison releasees, changing parole agent staffing levels, changes to Illinois Department of Corrections policy, changes in MSR conditions imposed by the Prisoner Review Board, and changes to the Illinois Compiled Statutes regarding how parole violations are handled.