California AB 109, the Public Safety Realignment Act signed into law in 2011, shifted responsibility for lower-level felony offenders from the state prison system to California’s 58 counties. Under the law, people convicted of felonies that are not serious, not violent, and not sex-registerable serve their sentences in county jail rather than state prison, and many people released from state prison for those same categories of offenses now report to county probation instead of state parole. In its first year alone, the law reduced the state prison population by more than 25,000.
Why the Law Was Passed
AB 109 was California’s answer to a court order. In Brown v. Plata (2011), the U.S. Supreme Court ruled 5–4 that overcrowding in California’s prisons violated the Eighth Amendment. The state’s 33 adult prisons held about 143,000 inmates in facilities designed for roughly 80,000, and the Court ordered the population reduced to 137.5 percent of design capacity within two years.1Justia US Supreme Court Center. Brown v. Plata – 563 U.S. 493 (2011) That required cutting the inmate count by roughly 33,000.
Governor Jerry Brown signed AB 109 within months. Rather than simply releasing prisoners or building more capacity, the legislature permanently rerouted whole categories of offenders out of the state system.2Stanford Law School. California Realignment
Who AB 109 Covers
Realignment centers on a category practitioners call “triple-nons”: offenders whose current conviction is not a serious felony, not a violent felony, and does not require sex offender registration.2Stanford Law School. California Realignment
The categories draw from existing Penal Code lists. “Serious” felonies are defined in Penal Code Section 1192.7(c) and include offenses such as robbery, arson, and assault with a deadly weapon. “Violent” felonies are defined in Section 667.5(c) and cover crimes such as murder, kidnapping, and certain sex offenses. A felony conviction that falls outside both lists, where the person is not a registerable sex offender, qualifies for county-level handling under AB 109.3California Legislative Information. California Penal Code 1170
Three groups are affected. Newly sentenced triple-non felons serve their time in county jail. Triple-non inmates released from state prison after October 1, 2011 report to county probation rather than state parole. And people under county supervision who commit technical violations of their release conditions can no longer be revoked to state prison; sanctions are handled locally.2Stanford Law School. California Realignment
Where You Serve Time: Split Sentences Under 1170(h)
Penal Code Section 1170(h) reroutes qualifying felony sentences from state prison to county jail. Within that framework, subsection (h)(5) authorizes “split sentences,” where a judge divides the term between a period of county jail custody and a period of mandatory supervision in the community. For qualifying offenses, this split is the default unless the court finds it inappropriate.3California Legislative Information. California Penal Code 1170
During the mandatory supervision portion, the offender reports to a county probation officer under conditions set by the court, which can include drug testing, employment requirements, or treatment. Supervision cannot be terminated early except by court order, and if the offender violates conditions, a judge can revoke the suspended portion and return them to county jail for the remainder.3California Legislative Information. California Penal Code 1170
Post-Release Community Supervision
For triple-non offenders released from state prison after October 1, 2011, AB 109 created Post-Release Community Supervision (PRCS). Instead of a state parole agent, these individuals report to a county probation officer for up to three years.4California Legislative Information. California Penal Code 3451
The statute requires PRCS supervision to be “consistent with evidence-based practices,” meaning programs shown by research to reduce recidivism.5California Legislative Information. California Penal Code 3450 Probation officers typically build individualized plans covering employment, substance abuse treatment, mental health services, and housing.
PRCS is not the catch-all for everyone leaving prison. Offenders convicted of serious felonies, violent felonies, third-strike offenses, or classified as high-risk sex offenders remain on state parole through the California Department of Corrections and Rehabilitation.4California Legislative Information. California Penal Code 3451
How Violations Are Handled
Penal Code Section 3454 gave county probation agencies a tool called “flash incarceration”: a jail stay of one to ten consecutive days imposed after a PRCS violation, without a full court revocation hearing. The idea is that swift, short consequences change behavior more effectively than tolerating violations until they add up to a full revocation. A few days in jail disrupts the pattern without wiping out a job, housing, or treatment progress. The statute encourages frequent short stays over infrequent long ones.6California Legislative Information. California Penal Code 3454
Flash incarceration sits inside a wider set of graduated sanctions. Counties can also impose electronic monitoring, drug treatment referrals, increased reporting, community service, or referral to a reentry court, and they have wide discretion to match the response to the violation.
How Counties Run It: Community Corrections Partnerships
AB 109 routes county decision-making through Community Corrections Partnerships (CCPs), which existed under SB 678 (2009) and gained expanded authority under realignment. Each county’s CCP recommends a spending plan for AB 109 funds to the board of supervisors, with an executive committee inside the CCP holding final approval authority before the plan reaches the board.
Membership is deliberately broad, chaired by the chief probation officer and including a superior court judge, county administrator, district attorney, public defender, sheriff, heads of social services and mental health, substance abuse program directors, the county superintendent of education, a local police chief, a community-based organization representative, and a victims’ advocate. The structure forces collaboration among agencies that historically worked separately, and the results vary widely by county. Some invested heavily in evidence-based treatment; others directed most of their AB 109 dollars toward jail expansion and law enforcement overtime.
How AB 109 Is Funded
Counties did not have to absorb realignment out of existing budgets. The state funds AB 109 through a dedicated 1.0625 percent share of the state sales tax, made permanent by Proposition 30 in 2012.7Los Angeles County Chief Executive Office. Estimated AB 109 Funding Levels for Fiscal Year 2025-26 By fiscal year 2022–23, total statewide AB 109 allocations exceeded $2 billion annually.
Government Code Section 30025 lists the eligible uses: managing local jails, providing housing and treatment for offenders, employing and training law enforcement, delivering mental health services aimed at reducing homelessness and preventable incarceration, and funding substance abuse prevention and recovery programs.8California Legislative Information. California Government Code 30025 That breadth gives counties significant flexibility, and two counties with similar allocations can spend the money in dramatically different ways. The allocation formula among the 58 counties has been persistently contested, particularly by rural counties that argue the formula does not reflect their higher per-offender program costs.
What the Results Have Been
By the basic measure, realignment reduced the state prison population. The count dropped by more than 25,000 in the law’s first year. As of June 2024, the California Department of Corrections and Rehabilitation reported roughly 92,600 incarcerated people in state institutions, with projections near 90,900 for June 2025.9California Department of Corrections and Rehabilitation. Spring 2025 Population Projections AB 109 by itself did not push the population below the court-ordered 137.5 percent threshold; that took the additional effect of Proposition 47 in 2014.
On crime, findings are mixed. A study reviewed by the California Senate Budget Committee found no robust evidence that realignment increased violent crime. Initial upticks in aggravated assault disappeared once researchers controlled for pre-existing statewide trends, and murder and rape showed no connection to realignment. Motor vehicle theft did rise in a statistically significant way, roughly 65 additional auto thefts per 100,000 residents annually, and that effect held after controlling for other trends. Broader property crime increases were not statistically significant once trends were accounted for.10California Senate Budget and Fiscal Review Committee. Public Safety Realignment and Crime Rates in California
On recidivism, the Public Policy Institute of California found that people on PRCS had two-year rearrest rates around 72 percent, about 2.6 percentage points higher than comparable pre-realignment populations, with reconviction rates rising by a similar margin. People sentenced under the new 1170(h) framework had rearrest rates of 74.5 percent (2.3 points higher), but reconviction rates actually dropped by 2 points. Offenders on split sentences had higher rearrest rates but lower reconviction rates, suggesting closer supervision catches more violations without producing more convictions.11Public Policy Institute of California. Realignment and Recidivism in California
How AB 109 Relates to Proposition 47
AB 109 changed where lower-level felons are held and supervised, but it did not change what counts as a felony. Proposition 47, passed in November 2014, did that. It reclassified personal-use drug possession as a misdemeanor regardless of circumstance and made theft, shoplifting, receiving stolen property, writing bad checks, and check forgery misdemeanors when the amount involved was $950 or less. People previously convicted of murder or certain sex offenses were excluded from reclassification.
Where AB 109 redirected offenders from state prison to county jail, Proposition 47 kept many out of the felony system entirely. The prison population dropped below the court-ordered threshold only after Proposition 47 took effect.
Ongoing Problems With Realignment
County jails were designed for short-term holds, not the multi-year sentences some realigned offenders now serve. Overcrowding hit many counties almost immediately, and some began releasing inmates early to make room. County jails generally offer less programming, medical care, and mental health treatment than state prisons, so some offenders may receive fewer rehabilitative services under realignment than they would have in the state system.
Probation departments absorbed sharp caseload increases with uneven preparation. Larger counties had existing infrastructure; smaller counties had to hire officers, secure treatment contracts, and build supervision protocols from scratch. The quality of PRCS supervision and split-sentence monitoring varies significantly across California, producing very different outcomes depending on where an offender lives.
Victim restitution also became more complicated. For offenders on PRCS, CDCR retains authority to collect restitution ordered as part of a state prison sentence, even though supervision is local.12California Department of Corrections and Rehabilitation. Restitution Collection and AB109 The split between state collection authority and county supervision can leave victims uncertain about who is enforcing what they are owed.
More than a decade in, the core trade-off in AB 109 has not been resolved. Local control brings flexibility and inconsistency in the same package. Counties that invested in evidence-based programming and strong supervision have results to point to. Counties that used AB 109 money mostly to fund jail operations do not.