CASE STUDY
Safety and Justice Challenge
LOCATION
Nationwide
ACTIVE
2015-present
A national initiative with The MacArthur Foundation to help jurisdictions across the U.S. implement data-informed strategies that will reduce the misuse and overuse of jails and racial and ethnic disparities present across the criminal justice system.
Challenge:
Local jails are often overlooked in conversations about mass incarceration and criminal legal reform. Jails are intended only to hold people serving short sentences—as well as those awaiting court proceedings who are a danger to community safety or a flight risk—but, in reality, their reach extends far beyond their mandate. On any given day, more than 650,000 individuals are held in American jails, with more than 7 million admissions per year. About 70 percent of individuals in jail are held pretrial—meaning, are presumed innocent—and many are held on small amounts of bail and/or misdemeanor charges. Further, Black, Latinx, and Indigenous populations, individuals with behavioral health and substance abuse challenges, and those with low incomes are dramatically overrepresented in jails. This comes at a cost to both incarcerated individuals and society: pretrial incarceration is linked with a greater likelihood of conviction and future rearrest, as well as reduced employment, income, and family well-being.
Over-incarceration is so ingrained in the criminal legal system that it can only be addressed through innovative solutions. Local drivers of over-incarceration must be identified and addressed from the ground up—within cities, counties, and states, with a diverse set of community stakeholders—to improve the system as a whole.
Approach:
Seeking to raise national attention to the problem of overuse and misuse of incarceration in local jail systems and to catalyze innovation and reform at the local level, in 2015, the John D. and Catherine T. MacArthur Foundation launched the Safety and Justice Challenge (SJC). Supporting a diverse network of more than 57 cities, counties, and states across the country in developing and implementing decarceration strategies, the SJC was designed to generate transformative change in how localities conceive of and use jail incarceration.
Supporting a diverse network of more than 57 cities, counties, and states across the country in developing and implementing decarceration strategies, the SJC was designed to generate transformative change in how localities conceive of and use jail incarceration.
Data, measurement, and evaluation have guided the work of participating cities and counties at all stages of policy and practice change, from identifying drivers of local jail populations, to designing innovative policies and practices, to monitoring progress and evaluating performance. As the national intermediary and primary data and analytic partner, CUNY ISLG played a leading role in driving this approach. The Institute regularly collected systemwide criminal legal data across SJC cities and counties that has served as a foundation for this work, and partners with local jurisdictions, external researchers, technical assistance providers, and the MacArthur Foundation to ensure that it is used effectively to support the goals of the initiative. CUNY ISLG undertakes a range of data and analytic activities to do this, including:
Creating and tracking performance metrics, and performing in-depth analysis to understand key outcomes;
Providing analytic and data capacity-building assistance to sites to support the development and implementation of robust strategies;
And providing strategic guidance and project management toward measurable outcomes.
The data collected by CUNY ISLG across SJC sites also provides a unique opportunity to identify effective strategies that can be shared with the larger field. To inform broader reform efforts, in 2019 CUNY ISLG launched a Research Consortium of pre-qualified researchers to carry out rigorous studies to better understand and inform the field of outcomes, impacts, and implementation lessons of the SJC work, including the effectiveness of various strategies for reducing jail incarceration and racial and ethnic disparities while preserving community safety.
Progress:
Since 2016, we have collected criminal legal data from 25+ SJC cities and counties annually, including case-level criminal legal data from across the system in 15+ jurisdictions. This data collection effort is designed for multiple applications; since it began, CUNY ISLG and other partners have used it for performance measurement and monitoring, data-informed technical assistance, research and evaluation projects, and more. We detail our data collection activities here; a subset of data is publicly available through our Measuring Progress tool. We have also used this data to conduct regular analyses on how SJC strategies impacted community safety. See the analyses from 2023, 2024, and 2026, all of which found no link between these strategies and increases in violent crime.
To date, SJC cities and counties across the country have collectively reduced their jail populations by as much as 20 percent, resulting in nearly 13,000 fewer people held in jail on any given day. System involvement of Black, Indigenous, and people of color (BIPOC) has also declined, though not as much as for white people, with disparities persisting. Importantly, our research has demonstrated that jail populations can be reduced safely. The Consortium has supported close to two dozen research projects on topics ranging from understanding the impacts of arrest diversion to unpacking the black box of prosecutorial decisions, better understanding women’s pathways to jail, and assessing the drivers of case processing delays. Findings from across key SJC strategies can be found on the Insight Hub.
Learn more by visiting the Safety and Justice Challenge site, or contact Reagan Daly at reagan.daly@islg.cuny.edu.
Latest Updates
After decades of rapid increase, cities and counties across the country were starting to reduce the numbers of women held in jails. But those numbers have started to climb again. A new analysis from CUNY looks at why women are being booked, how long they’re staying, and how it compares across demographics and to men.
The 2026 Safety and Justice Challenge Research Symposium was an opportunity to reflect on the meaningful efforts and results of participating cities and counties, and dug into the expansive knowledge of what worked, what didn’t, and what should come next.
Studying real, case-level data from cities and counties reducing their jail populations has led researchers to a conclusion: pretrial reforms made through the Safety and Justice Challenge did not lead to rising rates of crime, violent of otherwise. Two new analyses show this trend on both a initiative-wide and county-specific level.
The timely resolution of court cases is a responsibility of the court system. But many criminal courts struggle to resolve cases in reasonable timeframes, with case processing times increasing even when court filings decrease.
For the fourth year in a row, an analysis of individual-level jail data and county-level crime trends assessing the relationship between pretrial release and crime affirms past findings: violent crime and the rate that people returned to jail after release have remained the same before and after reforms were implemented.
Building on past work, Measuring Progress has expanded to include a new set of insights, highlighting the impact of SJC strategies on the individuals cycling through the jail system, what charges they are coming in on, how long they are staying, and whether they are returning to custody.
Factors leading to rising rates of incarcerated women are not well-understood or researched. Recognizing the differences in pathways that lead women and survivors of violence to jail are crucial to developing more gender-responsive, equitable, and effective criminal justice policies focused on reducing jail populations.
The FBI's recently released crime data confirms what we know: the pandemic-era spike in crime has largely subsided. But what caused it? To understand the big picture, we need to go deeper than federal data, which is only released annually.
In 2023, we began leading an entirely new work stream in partnership with the MacArthur Foundation and its affiliates to review and summarize lessons learned from across SJC-funded research projects and initiatives. The goal of this SJC synthesis work is to tap into our unique bird’s eye view to identify issues within the SJC research priorities that inform our work and the field at large.
As part of its efforts to lower jail populations across America and address racial disparities in the criminal justice system, the Safety and Justice Challenge recently funded a project examining racial disparities within a county jail. The resulting report presents an approach that can build greater racial equity within jail settings.
As part of its efforts to lower jail populations across America and address racial disparities in the criminal justice system, the John D. and Catherine T. MacArthur Foundation’s Safety and Justice Challenge recently funded a project examining racial disparities within a county jail.
Across communities participating in the study, people with frequent jail contact account for a majority of bookings, but account for a minority of the people booked. People of color and people with behavioral health needs are overrepresented.
A new study – “At The Intersection of Probation and Jail Reduction Efforts” – is a building block in understanding how probation, jail, and housing challenges intersect, and how providing transitional housing support can help reduce jail incarceration.
Blaming violent crime on criminal legal reforms without any evidence has many negative consequences, including increased political pressure to expand unnecessary, harmful and expensive incarceration practices. Equally dangerously, it diverts resources away from understanding the actual causes of crime, including the complex impact of COVID-19.
In an effort to avoid disrupting people’s employment, family, and other commitments, the Criminal Justice Investment Initiative (CJII) funded Project Reset, a post-arrest, pre-arraignment diversion program that diverts people arrested for low-level crimes away from the courts and into community-based alternatives.
Jurisdictions across the country can learn from efforts to study probation violations in-depth. A new report on probation violations as a driver of jail time in St. Louis County, Missouri shows that expediated probation programs have much to offer and can work to reduce racial and ethnic disparities in the system.
When it comes to fixing the societal problems that may lead to crime, it’s well understood that the overreliance on incarceration—especially local jails—is deeply inadequate. However, there is very little known about how to reduce that overreliance on local jails.
New research by Justice System Partners supported by the MacArthur Foundation’s Safety and Justice Challenge (SJC) shows the positive impacts of police-led deflection strategies on jail reduction efforts.
Measuring Progress expanded to include a new set of insights, highlighting the impact of SJC strategies on the individuals cycling through the jail system, what charges they are coming in on, how long they are staying, and whether they are returning to custody.
The PRTs generated good will at these SJC sites. They bring diverse stakeholders together and engage them in conversations they would not otherwise have. But digging into the numbers shows a more complicated story. In fact, PRTs do not substantially reduce jail populations on their own.
The primary purpose of a jail is to detain those who are waiting for court proceedings and are considered a flight risk or public safety threat. However, many people admitted to jail are there because they cannot afford to post bail. As a result, they may remain behind bars for weeks, awaiting trial or a case resolution. This overreliance on jails has negative consequences not only for those who are incarcerated, but also for their families and their communities, particularly communities of color. Findings from our new analysis suggest that decarceration strategies—approaches to keep people OUT of jail—can be crafted and implemented responsibly, without compromising public safety.
Building on significant momentum for evidence-based reforms to local justice systems, the John D. and Catherine T. MacArthur Foundation provided $18 million in grants as part of its Safety and Justice Challenge, a national initiative to reduce over-incarceration by changing the way America thinks about and uses jails. In this report, we measure and describe the effectiveness of strategies to reduce jail populations over the first three years of the initiative.
Project Reports
Nearly half of all women who are incarcerated are held in local jails. Despite work reducing the rate in which they are incarcerated, trends post-pandemic are trending upwards, especially when compared to men and significantly when looking at women of color. Looking at data from across the country, this brief provides insight into these trends and why it matters.
Many Safety and Justice Challenge sites report evidence of racial and ethnic disparities at different decision points in their case processing. Yet, they have less information about how disparities at one decision point can impact disparities at subsequent ones. It was clear that more research was needed into how disparities can compound across decision points and create cumulative effects.
Courts play a central role in local criminal legal systems, shaping the experiences and outcomes of people who face legal charges. Using data collected as part of the Safety and Justice Challenge, ISLG researchers explored how case processing time changed during and after the COVID-19 pandemic in response to public health restrictions and reduced court operations with data from 10 participating SJC jurisdictions.
As part of the SJC, New Orleans and Lucas County, Ohio, implemented tailored strategies to safely reduce jail populations, including a Public Safety Assessment. The Center for Justice Innovation examined whether the PSA managed to reduce jail populations without sacrificing community safety; they found that not only did it not increase crime, but recidivism rates generally decreased.
The Hub connects practitioners and policymakers around the country with the research and tools they need to innovate and improve the fairness and effectiveness of pretrial and jail-related decision-making and outcomes.
The Safety and Justice Challenge (SJC) Research Year-in-Review is a roundup of the latest research from sites across the initiative. The Review is compiled by CUNY ISLG, which serves as the primary data and analytic partner for the SJC, as well as the manager of the SJC Research Consortium. This edition of the Review summarizes research activities that took place throughout 2025, including updates on newly funded work, recently published research products, and work to synthesize findings across the SJC.
To learn more about decision-making processes among public safety communications professionals and influences on responding law enforcement officers, CUNY ISLG funded Arizona State University (ASU) and the University of Missouri-St. Louis (UMSL) through the Safety and Justice Challenge (SJC) to conduct a mixed methods study.
Cities and counties in the Safety and Justice Challenge have engaged in multi-agency efforts to safely shrink their local jail populations by nearly 18,000 people. Importantly, people released pretrial were no more likely to return to jail than before the SJC, including for violent crime. In this report, CUNY ISLG analyzed individual-level jail data from 5 participating counties to explore trends.
CUNY ISLG funded Justice System Partners (JSP) to conduct mixed-methods studies in Cook (IL), Lucas (OH), and Multnomah (OR) counties, where local defense agencies had led programs to systematically enhance due process for individuals at initial appearance.
This edition of the Review summarizes research activities that took place throughout 2024, including new Research Consortium memberships, updates on newly funded work, and recently published research products, with a spotlight on women and survivors of violence in the criminal legal system.
To learn more about the impact of emergency COVID-19 measures on jail reduction efforts, and think about emergency measures that could continue in the post-pandemic era, CUNY ISLG funded JSP through the SJC to conduct a mixed-methods case study on the emergency jail population reduction strategies implemented in Multnomah County, Oregon.
Two years out from COVID-19’s peak, there continues to be no apparent correlation between changes in incarceration and violent crime. Most individuals released from jail on pretrial status did not return to jail custody, and local violent crime rates varied regardless of changes to the jail population—suggesting that jail reduction reforms can be implemented safely.
This edition of the Review summarizes research that took place in 2023, including new Research Consortium member organizations and reviewers, updates on newly funded work, recently published research products, and what has been learned to date across research projects about racial and ethnic disparities in the criminal legal system.
Research on conditions of confinement has historically been limited by a lack of access to the perspectives of individuals residing in jail. To understand the factors driving inequity in jail culture, CUNY ISLG funded Justice System Partners to partner with Wellbeing & Equity Innovations (WEI) to conduct a mixed-methods study in an SJC site using community-based participatory research methods.
In its eighth year, the SJC now supports a diverse network of more than 57 cities, counties, and states across the country in developing and implementing decarceration strategies. This report breaks down its the data-driven model of criminal justice reform, including what kinds of data were captured, how data were mobilized for change, and lessons learned when using administrative data for policy design and evaluation.
Research has uncovered that community safety cannot be treated in a one-size-fits-all manner, and conversations about safety should be locally oriented, bearing in mind the unique local contexts and nuances.
Funded by ISLG, this study sought to track the flow of people with frequent jail contact, assess the various strategies used by sites to reduce jail contact, and investigate outcomes, especially for people of color and people with behavioral health conditions.
This study aimed to decipher the system-level trends in jail incarceration for probation violations and the key pathways to jail incarceration for those individuals currently on probation.
To compliment and expand upon the data trends published by ISLG, the Urban Institute, an SJC partner, worked with a handful of SJC cities and counties to produce a series of case studies digging deeper into several SJC strategies.
The report showed that, on average, SJC cities and counties successfully reduced jail populations without jeopardizing community safety. People released from jail after the implementation of criminal legal reforms were no more likely to return to jail within a year and were extremely unlikely to return to jail for a violent crime.
One practice that defines the pretrial period is plea bargaining. Despite the wide use of plea bargaining, little is known about the practice, largely because it happens outside public view and with little documentation. In an effort to uncover plea bargaining practices, ISLG funded two studies from two research partners: the Urban Institute to conduct a mixed-methods study of plea bargaining processes in one SJC site—Philadelphia, Pennsylvania; and Loyola University Chicago and the University of Missouri-St. Louis (UMSL) to conduct mixed-methods studies of plea bargaining processes in two SJC sites: Milwaukee County, Wisconsin and St. Louis County, Missouri.
Earlier this year, ISLG launched Measuring Progress, an interactive tool that can help stakeholders and the public track progress achieved by Safety and Justice Challenge sites. ISLG has dug deeper into two of the findings so far relating to the effects of COVID-19 on jail populations and racial and ethnic disparities. These briefs provide additional important context to the trends shown in the tool.
Towards the goal of reducing the jail population, New York City expanded the City’s Supervised Release Program (SRP) several times by altering the eligibility criteria to include a wider range of individuals. The first large expansion of SRP since 2016 occurred at the beginning of June 2019.
In an effort to better understand the impact of expansion of SRP as a jail-reduction strategy, ISLG and the SJC Research Consortium funded the Center for Court Innovation to examine the impact of the June 2019 expansion.
For this brief, the Urban Institute analyzed trends in jail incarceration for the probation population using datasets for jail bookings in the county from 2015 to 2020 and petitions-to-revoke (PTRs) for people on probation from 2016 to 2020. In addition to describing overall trends in jail bookings and PTRs, this brief analyzes average lengths of stay in jail for the probation population, as well as racial and ethnic disparities in these data.
Currently implemented in more than a dozen cities around the country, jail Population Review Teams (PRTs) are one strategy to reduce jail populations. Funded by the SJC and with guidance from ISLG, the Center for Court Innovation conducted a quantitative research study of the PRT model and its impacts in three sites through the spring of 2020: Lucas County, Ohio; Pima County, Arizona; and St. Louis County, Missouri.
The Urban Institute, a Safety + Justice Challenge Research Consortium Member, conducted an in-depth process and impact evaluation of the Misdemeanor Diversion Program (MDP) in Durham County, North Carolina, which resulted in a series of reports on the program’s implementation and effectiveness. The first report was released in July 2021 and focused on The Urban Institute’s exploration of the MDP’s implementation, successes, challenges, and perceived impact. The second report, released in November 2021, focused on program outcomes, including enrollment, completion, recidivism, and system-level impacts. Overall, the findings show fewer new criminal justice contacts and reductions in racial disparities; findings also emphasized the need for local law enforcement buy-in, the need to scale the MDP, and the need to improve data collection as critical for MDP’s continued success. A policy brief synthesized results from both components of the evaluation and offered policy implications for these types of efforts, specifically in the context of young adults.
The goal of the Safety and Justice Challenge is not only to reduce jail populations, but to do so safely—and this has been a pillar of the initiative since its inception in 2015. While previous briefs have highlighted the substantial reductions made in jail populations across SJC sites, this report provides an initial look at SJC’s decarceration strategies through a safety lens. More specifically, it explores how aggregate crime rates and returns to custody among people released from jail changed after the launch of SJC and the implementation of its decarceration strategies in sites through 2019. Overall, the findings suggest that decarceration strategies can indeed be crafted and implemented responsibly, without compromising public safety. In fact, public safety outcomes across SJC sites and in most individual sites remained relatively constant before and after the implementation of decarceration reforms.
This interim report focuses on performance three years into the Safety and Justice Challenge (through April 2019), an initiative supported by the John D. and Catherine T. MacArthur Foundation to reduce populations and racial disparities in American jails. Three years of data from SJC sites across the United States shows it’s possible to successfully reduce jail populations.
A new brief highlights jail population trends during the COVID-19 pandemic. Throughout 2020, as the extensive impacts of the COVID-19 pandemic became clear, many municipalities—including those participating in the John D. and Catherine T. MacArthur Foundation’s Safety and Justice Challenge (SJC) — implemented emergency measures to reduce their jail populations. Here we describe how those measures influenced jail populations in SJC sites between February and October 2020.
To lend an objective review of 2017 justice reforms in Cook County, IL, the Safety and Justice Challenge Research Consortium issued a RFP for researchers to assess the relationship between bond court reform and crime in the County, grounding local debates in a meaningful and robust analysis that addressed the limitations of prior analyses. Researchers from Loyola University’s Center for Criminal Justice Research, Policy, and Practice conducted the study and this report summarizes their findings: that the new policy significantly increased the number and rate of pre-trial releases, reduced bail amounts for defendants where bail was still ordered, and had no effect on new criminal activity or crime.
These findings provide evidence that advancing equitable and thoughtful criminal legal reform is possible without compromising safety to the community.