California’s AB 109, known as the Public Safety Realignment Act, is a 2011 law that moved responsibility for certain lower-level felony offenders out of state prisons and state parole and into county jails and county probation departments. Signed by Governor Jerry Brown and effective October 1, 2011, the law was California’s response to a U.S. Supreme Court order in Brown v. Plata requiring the state to reduce its prison population to 137.5 percent of design capacity.1Justia U.S. Supreme Court. Brown v. Plata, 563 U.S. 493 (2011) Rather than release large numbers of inmates, the Legislature redirected certain offenders away from the state system entirely. Within a year, the state prison population fell by roughly 27,400 inmates.2California Department of Justice. 2011 Public Safety Realignment – CDCR Fact Sheet
Who AB 109 Applies To
The law covers people whose current felony is not serious, not violent, and not sex-related. Practitioners call this the “triple-non” standard. Typical examples include commercial burglary, check fraud, and low-level drug possession. If the current offense doesn’t appear on California’s statutory lists of violent or serious felonies, and the person isn’t required to register as a sex offender, the case usually falls under realignment.
The two statutory lists set the boundary. Violent felonies include murder, robbery, kidnapping, arson, and carjacking.3California Legislative Information. California Penal Code 667.5 Serious felonies cover a broader range, including first-degree burglary, bank robbery, assault with a deadly weapon, and selling certain controlled substances to minors.4California Legislative Information. California Penal Code 1192.7 Anything on either list pushes a case outside realignment.
Priors Count Differently for Sentencing and for Supervision
This distinction trips people up. For sentencing, any prior or current serious or violent felony conviction sends the person to state prison, even when the new offense is minor.5California Legislative Information. California Penal Code 1170 The same rule applies to registered sex offenders and to defendants sentenced with an aggravated white-collar crime enhancement.
Post-release supervision works the other way. When someone finishes a state prison term and the commitment offense itself qualifies as triple-non, they go to county supervision regardless of their prior record.2California Department of Justice. 2011 Public Safety Realignment – CDCR Fact Sheet A person with a decades-old robbery conviction who just finished a sentence for drug possession is supervised by county probation, not state parole.
How Sentencing Changed
Before realignment, nearly every felony sentence meant state prison. AB 109 rewrote Penal Code 1170(h) so that triple-non felonies are now served in county jail.5California Legislative Information. California Penal Code 1170 The term lengths stayed the same (commonly 16 months, two years, or three years), but the person serves the time locally. County jails were built for short pretrial holds, not multi-year sentences, and they generally offer fewer programs and less space than state prisons.
Split Sentences
AB 109 created the “split sentence,” now the default in realignment cases. A judge divides the total term between jail custody and a period of mandatory supervision in the community. A three-year sentence might become 18 months in jail followed by 18 months on county probation supervision.5California Legislative Information. California Penal Code 1170 The statute presumes a split sentence. A judge can impose a straight jail term, but only after making a specific finding that a split sentence wouldn’t serve the interests of justice. During mandatory supervision, the person reports to a probation officer and must follow conditions much like traditional probation. Violations can bring the person back to court for modification or revocation.
Custody Credits
Realignment sentences served in county jail earn credits under Penal Code 4019 on a day-for-day basis: for every two days actually served, four days count toward the sentence.6California Legislative Information. California Penal Code 4019 That roughly halves a straight jail term, assuming the person follows facility rules and performs assigned work. The mandatory supervision portion of a split sentence earns only actual-time credit; there is no day-for-day reduction on the supervision tail.
Post-Release Community Supervision
The second major piece of AB 109 is what happens after someone leaves state prison. The law created Post-Release Community Supervision (PRCS), which routes triple-non offenders to county probation departments instead of to state parole.7California Legislative Information. California Penal Code 3451 PRCS lasts up to three years from the date of release. The supervising probation department sets conditions consistent with evidence-based practices, meaning conditions grounded in research on what actually reduces reoffending.8California Courts. Postrelease Community Supervision Act of 2011
One structural change matters above the rest: people on PRCS who violate the technical conditions of their supervision cannot be returned to state prison. Any sanction stays at the county level.
What Happens When Someone Violates
AB 109 gave probation departments a graduated response toolkit. The most distinctive tool is flash incarceration: a probation officer can send someone to county jail for one to ten days without going to court, as an immediate consequence for a PRCS violation.9California Legislative Information. California Penal Code 3454 After the flash period, the person returns to community supervision. The Legislature designed this as a first-line response, favoring short and swift stays over the long revocations that defined the old parole system.
When intermediate sanctions aren’t enough, the supervising agency can petition the court to revoke, modify, or terminate PRCS. If the court finds a violation, it can modify conditions, order up to 180 days in county jail per violation, or refer the person to a reentry court or evidence-based treatment program.10California Legislative Information. California Penal Code 3455 Even in the worst case, the person stays in the county system.
How Counties Pay for Realignment
Shifting thousands of offenders to counties without money would have collapsed the system. Companion legislation (AB 118) created the Local Revenue Fund 2011, drawing from redirected portions of the state sales tax, vehicle license fees, and excise taxes.11Department of Finance. Fund 3171 – Local Revenue Fund 2011 The money flows to all 58 counties and must be used exclusively for public safety. A later constitutional amendment locked in these revenues so the state cannot claw them back without voter approval. Each county also maintains a Community Corrections Partnership, chaired by the chief probation officer and including the district attorney, public defender, sheriff, a police chief, a superior court representative, and the heads of county social services, mental health, employment, substance abuse, and education departments, along with a community-based rehabilitation organization and a victims’ representative.12California Legislative Information. California Penal Code 1230 That partnership writes the county’s local public safety plan.
What AB 109 Means for Victims
Realignment left some awkward gaps on the victim side. When a court orders victim restitution as part of a state prison sentence, CDCR keeps authority to collect even after the offender moves to county PRCS. Victims cannot make restitution payments through the county probation department for state-imposed obligations; CDCR refers those cases to the Franchise Tax Board for collection after release.13California Department of Corrections and Rehabilitation. Restitution Collection and AB109
Victim notification has also been uneven. Marsy’s Law requires that victims be notified when offenders are considered for release or moved between facilities, but the new categories created by AB 109 (PRCS, flash incarceration, mandatory supervision) didn’t exist when Marsy’s Law was written. Counties have struggled to decide when notification obligations apply to these statuses, particularly for early release to house arrest or electronic monitoring due to jail overcrowding. Victims seeking information about an offender’s restitution balance or release status can contact CDCR’s Office of Victim and Survivor Rights and Services.13California Department of Corrections and Rehabilitation. Restitution Collection and AB109
Whether you are facing a felony charge, finishing a prison term, or tracking an offender’s status, the single question that governs almost everything under AB 109 is whether the current offense is triple-non. That one line determines which side of the state-county divide the case falls on, and nearly every other rule follows from the answer.