Tagged: statistics

Unsubstantiated Claims for Effectiveness of Rehabilitation Programs

by · Sep 5, 2025 2:23 pm

Corrections officials often claim that their rehabilitation programs are “evidence-based.” For example, a recent report by the California Department of Corrections and Rehabilitation (CDCR) found that participants in enhanced alternative custody programs (EACPs) recidivated at a lower rate than nonparticipants. The report’s accompanying press release painted the results as a clear win for the program. This framing is misleading because the evidence doesn’t hold up under closer scrutiny.

In a recently published Research in Brief, we raise doubts about these claims of effectiveness, noting how the report presents descriptive statistics rather than causal evidence.

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Police Stops and Naïve Denominators

by · Aug 11, 2025 12:19 pm

In their 2025 article published in Crime Science, Jerry Ratcliffe and Shelley Hyland critically examine how reported racial disparities in police stop data can be misleading. They argue that much of the misrepresentation stems from the widespread use of an inappropriate baseline, or “denominator,” when calculating stop rates.

Typically, analysts compare the distribution of police stops across different racial groups to the distribution in the total city population. Unfortunately, this method does not account for differences regarding who is actually more or less likely to encounter police stops. In doing so, this approach ignores important factors such as the uneven geographic distribution of crime and variations in police deployment. According to the authors, by relying on this “naïve denominator,” studies risk overstating racial disparities. Ratcliffe and Hyland’s work challenges researchers, policymakers, and the public to reconsider how police stop data should be interpreted to paint a more accurate and nuanced picture of racial bias in law enforcement.

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Understanding retail theft in California

by · Jul 9, 2025 11:14 am

Concerns about retail theft in California have grown in recent years, with implications for businesses as well as the broader economic climate and the sense of safety across communities. In response, California lawmakers and voters have enacted several legal reforms aimed at curbing theft. A recent report from the California Legislative Analyst’s Office breaks down what we know about retail theft trends over the past decade, explores potential contributing factors, and reviews how recent policy changes may have affected these trends.

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$380m federally funded Justice Reinvestment Initiative fails to deliver on public safety promises

by · Jun 30, 2025 4:36 pm

The federal Justice Reinvestment Initiative (JRI), launched in 2010 and funded by the Bureau of Justice Assistance (BJA), was designed to help states reduce prison populations through legislative reform and evidence-based practices. The initiative offers grant funding as an incentive for states to revise sentencing, pretrial, and community supervision policies. The core idea is to save money by reducing incarceration and reinvesting those savings into local, community-based programs that address root causes of criminal behavior, such as mental health and substance use issues, with the ultimate goal of lowering recidivism.

Despite these aims, there is limited evidence that JRI reforms have consistently achieved their intended outcomes. While many state programs report success in reducing their prison populations, these analyses often rely on superficial data and overlook critical metrics such as public safety. The lack of rigorous evaluation, narrow definitions of “success,” and inconsistent implementation have led to growing concerns—especially about whether offenders released under JRI reforms are adequately supervised.

A recent report published by CJLF critically assesses the impact of JRI, exploring the shortcomings of its implementation in various states. Policymakers are urged to adopt a more cautious, evidence-based approach, including piloting programs and closely monitoring outcomes to ensure public safety is not compromised in the name of reform.

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Understanding the 2020–2021 homicide spike in the U.S.: Causes, variations, and recovery patterns

by · Jun 2, 2025 10:34 am

The United States experienced a sharp rise in homicide rates during 2020–2021, prompting widespread research into one of the most significant crime surges on record. A recently published study by the Manhattan Institute analyzed homicide patterns in 78 large cities, identifying shifts in city-level trends and exploring links to policing disruptions, social unrest, and pandemic-related economic changes. While the study was not designed to evaluate criminal justice reform initiatives, its findings have implications for understanding the social context in which many of these programs were implemented.

Researchers found that the spike in homicides was tended to be more severe in cities and communities already struggling with high baseline violence, with contributing factors including reduced police staffing, disrupted public services, and concentrated group-related gun violence. Surprisingly, unemployment shifts during the pandemic were not consistent predictors of rising homicides, challenging common assumptions.

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Police resources and crime solving: A closer look at clearance rate trends in California

by · Nov 8, 2024 2:20 pm

A recent report by the Center on Juvenile and Criminal Justice (CJCJ) tried to take a stand by exposing poor clearance rates of California law enforcement agencies. They specifically argue that police staffing levels and police spending do not translate to improved clearance rates and actually increase crime.

While clearance rates are an important metric for measuring police effectiveness, the conclusions of the CJCJ report are questionable because the analysis lacks depth and overlooks critical factors related to clearance rates. In this post, I’ll provide additional context to offer a more balanced perspective on the relationship between police resources, clearance rates, and crime rates. Continue reading . . .

Prop 47’s impact on crime in California

by · Oct 24, 2024 2:37 pm

When California voters passed Proposition 47 in 2014, the goal was noble: decrease incarceration rates for nonviolent offenders and redirect resources towards rehabilitation and public safety programs. The measure reclassified certain felonies to misdemeanors, thereby lowering the severity of penalties for certain offenses, and has been touted as a revolutionary step in California’s criminal justice reform. Proponents argued that this would lead to reduced recidivism and better community outcomes. However, a decade later, the reality is far from the success story many hoped for. A recent paper by the Manhattan Institute discusses some of the ways in which Prop. 47 has negatively impacted public safety and health and put strain on county resources.

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Unpacking the truth: California’s reforms and crime data accuracy

by · Aug 15, 2024 5:18 pm

In recent years, the debate surrounding criminal justice reforms in California, has sparked significant discussion. A recent paper by the Center for Juvenile and Criminal Justice claims that reforms such as Proposition 47 have led to a substantial decrease in property crime rates, citing a 53% reduction since 1995 and a 13% decline in Part I property crimes from 2009 to 2023. While the paper shows real data on reported crime, their analysis is oversimplified and missing several important details, presenting potential flaws in their argument.

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Recidivism trends in California: New CDCR report

by · Feb 21, 2024 2:55 pm

Recidivism rates are down, according to a new report by the California Department of Corrections and Rehabilitation (CDCR). In a press release accompanying the report, they state that “the report marks the second year of data showing the effects of the passage of Proposition 57, and the findings point to lower recidivism rates for those who earned credits from participation and completion of rehabilitative programming.”  But this statement is misleading. While the data showed a slight decrease in recidivism rates, correlation does not equal causation, and this would be an overly simplistic interpretation of the data. There are other factors that could have contributed to recidivism rates, such as the COVID-19 pandemic, which influenced crime rates and caused many court closures and temporary suspensions of intakes and transfers to CDCR, which likely influenced recidivism measures in this report. The report did not rigorously evaluate the impacts of Prop 57, and therefore, the findings are not sufficient to demonstrate a casual relationship between Prop 57 and reduced recidivism rates. Continue reading . . .