A new study from the Cato Institute finds that when Illinois cut supervised release periods from one year to six months for certain prisoners, the share who returned to prison within a year dropped by 41–45 percent—and crime rates didn't budge. The research, published June 10, 2026, analyzed a natural policy experiment created when Illinois amended its SAFE-T Act in late 2022, changing parole terms for prisoners convicted of lesser offenses. The findings add to growing evidence that parole supervision increases reincarceration through technical violations without making communities safer.
The study compared prisoners convicted of Class 3 and 4 offenses who left prison in the six months before the December 6, 2022 amendment—who got one year of mandatory supervised release—with those released in the first five months of 2023, who received six months. The shorter supervision period reduced returns to prison by 9–10 percentage points. Nearly all of that reduction came from fewer technical revocations, which happen when parole boards decide someone violated supervision conditions like failing to get permission before traveling or associating with certain people, not from committing new crimes. During the first 15 months after release, the reform had no detectable effect on rates of new felony charges, new felony convictions, or returns to prison for new crimes.
The report finds that less supervision reduced revocations, leaving more parolees out of prison and theoretically able to commit crimes—yet the absence of supervision also reduced the likelihood they'd commit crimes, offsetting any increase. According to the authors, the constraints of supervision may hinder parolees' ability "to find stable housing, secure employment, and address other factors that promote successful post-release transitions." Policy simulations estimate that cutting existing supervision terms in half for Class 1 through 4 prisoners—excluding the most serious Class X offenders and sex offenders—would reduce Illinois's average prison population by roughly 3 percent with no harm to public safety.
The report explains that longer parole terms diminish the benefits of lawful behavior because parolees face ongoing threat of technical revocation even when they don't commit crimes. Consider two people released the same day: one faces six months of supervision, the other two years. If both avoid all violations for six months, the first exits supervision and only risks prison if they commit a new crime. The second knows authorities can send them back for technical reasons for another 18 months, even with perfect behavior. That difference changes how rewarding good behavior feels. The authors note that supervision conditions are extensive—parolees must live in approved residences, allow officers to search their homes on demand, and get permission before changing addresses or traveling.
The study's policy implications aren't entirely clear, the authors write—some may see a call to reform parole rules and procedures, others may favor replacing supervision with nonprofit-provided services like vocational training, while some may argue for abolishing post-release supervision entirely since it restricts liberty without enhancing safety. The authors point to similar findings from California, which banned reincarceration for technical parole violations in 2011 and saw prison populations drop without increased crime. With U.S. parole populations ranging from roughly 650,000 to 850,000 in recent years, the bottom line is stark: cutting supervision in half could keep thousands out of prison without putting anyone at greater risk.