Research Report

Incarceration Trends Pretrial Probation June 25, 2026

Implementing a Mobile Probation Unit

In the United States, more adults are under probation supervision than are held in prisons and jails or under parole supervision combined. In 2023, about 3.1 million, or 1 in 85 US adults, were subject to probation supervision. Probation violations, owing to technical violations or new offenses, are a significant driver of jail incarceration. With support from the MacArthur Foundation’s Safety and Justice Challenge (SJC), Palm Beach County, Florida, established its Mobile Probation Unit (MPU) to improve access to probation services, reduce probation violations, and limit jail reincarceration for people on probation.

Why This Matters

Probation departments play a critical role in determining whether people remain safely in the community or cycle back into local jails for technical violations or new arrests. Yet many people face barriers to complying with probation requirements, including lack of transportation, unstable housing, and work and family obligations. These challenges are especially pronounced in a county as dispersed as Palm Beach, where accessing probation offices can involve long travel times and multiple transfers on public transit. Providing flexible, accessible, and supportive probation services can increase compliance, reduce unnecessary jail incarceration, and improve long-term outcomes for people on probation.

What We Found

The Mobile Probation Unit was developed to bring probation services directly into communities, reducing logistical barriers that often lead to violations. Stakeholders reported several key successes associated with the intervention. The MPU was expanded beyond its initial pilot program, indicating strong early support and use. Its convenience contributed to consistent use by many people on probation, and stakeholders reported a reduction in probation violations after the MPU was implemented. Implementing the MPU also strengthened collaboration between criminal legal system stakeholders and community partners. Challenges associated with developing the MPU included inconsistent staffing of the unit, limited success reaching parts of the county most affected by racial disparities in criminal legal system involvement, and limited availability of supportive services.

How We Did It

For this case study, we conducted semistructured interviews with 16 key criminal legal system stakeholders in Palm Beach County and 10 people on probation who used the MPU; reviewed SJC progress reports and other documentation related to the development and implementation of the MPU; analyzed program data provided by local stakeholders; and examined jail population data collected by the Institute for State and Local Governance. We analyzed transcripts and notes from the interviews using NVivo qualitative analysis software, applying a codebook developed to identify themes related to the implementation of the MPU and other local criminal legal system reform efforts.

Research Report

Housing Incarceration Trends Probation July 11, 2023

At The Intersection of Probation and Jail Reduction Efforts: Findings on Probation, Jail, and Transitional Housing Trends in Pima County, Arizona

Ammar Khalid, Rochisha Shukla, Arielle Jackson, and Andreea Matei

Reducing jail populations – and the collateral consequences of criminal legal system involvement – requires jurisdictions to critically examine why and how people are entering the system to begin with. Much of the research around jail reform focuses on the pretrial population; however, with rising numbers o individuals under probation supervision and jail commonly being used to detain those awaiting a hearing on a probation violation, reform efforts to understand how violations contribute to the overall jail population are essential. To learn more about the impact probation revocations have on jails and to advance promising strategies to address them, CUNY ISLG funded the Urban Institute through the Safety and Justice Challenge (SJC) to conduct a mixed-methods study on how people on probation end up in jail incarceration and the impact of a program aimed at improving these outcomes with transitional housing support through the Adult Probation Department (APD) in Pima County, Arizona. Using administrative data from the Pima County Jail and APD, case record reviews, and interviews with APD leadership, probation officers, judges, community-based housing providers, and people on probation, 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. It also sought to understand the impact of the transitional housing support program on short and long-term outcomes for people on probation receiving funding from APD for transitional housing.

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Expediting Probation to Reduce Length of Stay in Jail

By: Beth Huebner, Lee Ann Slocum

Data Analysis Incarceration Trends Probation January 12, 2023

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.

Probation matters. More people are under probation supervision in America than any other correctional sanction. One in 84 adult U.S. residents is on probation right now, which increases the risk for later imprisonment. As an initiative of the John D. and Catherine T. MacArthur Foundation, the Safety and Justice Challenge (SJC) is seeking to reduce jail populations. So, looking at probation violations is an important step toward doing that. Most of the current research on jail reform has considered the pretrial population, but we know less about individuals returned to jail for a probation technical violation, which includes failure to meet the conditions of probation supervision (e.g., maintaining employment, regular office visits, and routine drug tests).

We looked at the probation revocation process in St. Louis County, an SJC site. Before joining the SJC, the county’s jail population had been either near or over capacity for over a decade. But it has reduced average jail populations by 30% since 2016 through a series of measures.

We looked at how long people who violated probation in St. Louis County were detained in jail, and race differences in jail admission and length of stay trends. We also used a racial equity framework for the study to see if jail reform efforts harmed or helped people of color. As part of this work, we evaluated the county’s Expedited Probation Program (EPP). This program was implemented as part of the SJC reform efforts and is designed to speed up case processing and provide services for people detained on a probation violation.

We found that individuals who are booked into jail for probation violations represent a small part of the total jail population in St. Louis County, but they have substantially longer lengths of stay than other groups. The length of stay for people on probation declined by 33% from 2016 to 2019, from 44 to 30 days. In comparison, the average length of stay for the total jail population remained stable at 23 days in 2016 and 2019.

While Black individuals on probation had longer lengths of stay than White individuals, we found that some racial disparities in length of stay have declined over time. Still, racial disparities remain in the jail population. While the county population is about two-thirds White and one-fourth Black, the 2016 and 2019 jail probation population was made up of about 54% Black individuals compared to about 45% White individuals.

Meanwhile, the EPP program provides evidence that reforms can reduce the length of time people on probation are in jail and an opportunity to learn about potential best practices. Broadly, the program is designed to expedite the revocation process to divert individuals from jail to community-based treatment. Unlike most correctional interventions, the primary aim of the project is to change how individuals are processed in jail instead of solely expecting individuals in the program to reform based on service provision. Specifically, the goal of the EPP is to have individuals evaluated by a judge and released within 10-12 days of incarceration.

The EPP model integrates evidence-based interventions including: 1) detailed coordination with members of the supervision team such as probation officers, jail case managers, and community treatment staff to ensure a continuum of care; 2) case coordination with a probation officer embedded in the jail; 3) treatment plans presented to judges for approval (reducing delays in the hearing process); and 4) warm handoffs and linkages to services.

The Expedited Probation Program (EPP) achieved its goal of reducing the number of days individuals admitted to the program were detained in jail, and these reductions were substantial. On average, participants spent 28 days in jail compared to 65 days among people in a comparisons group who were not in the program. Further, the processing time continued to decline as the program progressed.

In addition, the implementation of the program led to a larger decline in the length of stay for Black individuals in the program. Although this effect needs to be explored in more detail, there is potential evidence that this type of change to case processing may be able to attenuate some of the racial disparities inherent in this part of the criminal legal system.

While the program was successful in reducing the number of days people were detained in jail, the recidivism rates were higher for the EPP group than for the comparison group. Interviews with program staff suggest that there is substantial stress and barriers to compliance with the court-mandated programming associated with the intervention, which may have led to higher rates of technical violations, like failure to meet conditions of substance abuse treatment or missing appointments, among the intervention group. Emerging from our interviews with stakeholders and system-involved people also indicated that people on probation have substantial unmet needs, many of which were related to substance use disorders and poverty. COVID-19 also has changed how the probation office Interacts with clients, shifting to a community-based model in which probation officers meet clients in the community or over Zoom. There is general support for these changes. In addition, many of the participants appreciated the ability to interact with the court virtually for probation violation hearings.

Overall, the results of the EPP program suggest that collaborative processes can be instituted to reduce the time spent in jail for a probation violation. That noted, to reduce the rates of recidivism among this group, more work needs to be conducted to better understand the needs of people released and how to best provide services to this group that facilitates long-term integration.

Research Report

Frequent Jail Users Incarceration Trends Probation Racial and Ethnic Disparities January 12, 2023

Probation Violations as Drivers of Jail Incarceration in St. Louis County, Missouri

Beth M. Huebner, Lee Ann Slocum, Andrea Giuffre, Kimberly Kras, and Bobby Boxerman

Many have argued that we are in the era of mass probation, as more people are under probation supervision than under any other correctional sanction. Although there have been declines in the national probation population over the past decade, one in 84 adult US residents is currently on probation. Nationwide, local jail populations have also grown—from 184,000 in 1980 to 741,900 in 2019. The increased use of probation inflates the population at risk of subsequent confinement in jail or prison. Individuals who violate their probation, in some states, are detained in jail and await a hearing. Despite the growth in probation revocations and the increased use of jail stays as a response to technical violations, however, there is little evidence to suggest that short-term stays of incarceration reduce recidivism.

Adding to the growing rate of probation is the problem of racial disparity in incarceration. People of color are disproportionately represented among the probation population. In 2018, Black people represented 30% of the US probation population, twice their proportion in the national population. Further, almost half of all young Black men (24 to 32 years old) with no high school degree reported having been on probation at some point. Black individuals, particularly young men, are also more likely than White individuals to struggle on probation and to be given multiple conditions of supervision. Although there is evidence that Black individuals are more likely to have their probation revoked, less is known about how revocation to jail influences trajectories and outcomes for this group.

Jail stays also have deleterious effects in the short and long term. For example, Harding and colleagues found that short terms of jail incarceration resulting from technical violations suppressed the earnings of individuals by about 13% in the nine months after release from custody. The churn of multiple jail stays, even if short in length, also causes strain and instability among families, leaving them feeling hopeless under the constant eye of supervision. Yet, the unique needs of jail populations overall, and those of individuals who violate probation terms, are rarely considered in correctional reforms.

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Research Report

Housing Incarceration Trends Probation Racial and Ethnic Disparities May 5, 2022

Trends in Jail Incarceration for Probation Violations

Rochisha Shukla, Ammar Khalid, Arielle Jackson

Urban Institute report on Trends in Jail Incarceration for Probation Violations

In partnership with the Adult Probation Department in Pima County, Arizona, and as part of broader research funded by the Safety and Justice Challenge to examine the impact on jail use of providing housing supports for people on probation in Pima County, the Urban Institute analyzed trends in jail incarceration for people with probation violations using datasets for overall jail bookings in the county from 2015 to 2020 and petitions-to-revoke for people on probation from 2016 to 2020. This case study summarizes our findings on patterns in overall jail bookings and petitions-to-revoke and, for the probation population in jail, analyzes average lengths of stay and patterns by race and ethnicity and sex.