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This study examines crime in suburban Abuja, Nigeria, to assess whether the patterns of crime concentration commonly identified in developed contexts are also evident in an understudied, data-poor…

This study evaluates the effectiveness of a Dutch police intervention conducted in March 2025 targeting drivers sanctioned for using a smartphone in traffic. As part of the intervention, individual...

Why do crowded streets sometimes deter crime and sometimes attract it? Pedestrian volume can reduce crime through informal surveillance (“eyes on the street”) or raise it by expanding anonymity and…

Abstract. This article examines how police officers and staff understand police uniforms as shaping professionalism, internal legitimacy and the public per

Do fixed automated license plate reader (ALPR) networks reduce motor vehicle theft or improve case outcomes? We use the staggered deployment of fixed ALPRs supplied by Flock Safety across 216 U.S.…

This article argues that police services should not defend Equity, Diversity, and Inclusion (EDI) primarily through the private-sector “business case”. Although claims about performance, efficiency,…

Objectives Despite numerous evaluations assessing public perceptions of specialized police equipment, few studies have examined how citizens perceive officers’ use of everyday tools, such as mobile…

A novel dataset provides some surprising answers

Purpose: Understanding how much of routine policing involves vulnerable people could inform resourcing, training, and multi-agency response, yet administrative data provide limited insight. We…

In recent years, homicides linked to organized criminal groups (OCGs) in Sweden have increased sharply, coinciding with changes in their modus operandi. Despite growing concern in Sweden and…

The long-term decline in homicide clearance rates has persisted even as homicide levels fluctuate, underscoring the need to better understand the forces that shape investigative outcomes and public engagement...

This chapter examines the implementation and impact of gunshot detection technology (GDT) by law enforcement agencies across the United States. While GDT holds promise for enhancing police response…

Outlaw motorcycle gangs (OMCGs) are a cause of growing concern, not least because their members are found to be disproportionately engaged in serious and organized crime. As of 2020, upon request of…

Taser rollout rests on a two-part promise: control at a distance should replace close-contact force and reduce injury. Using 579,524 Metropolitan Police use-of-force reports from 2018–2021, we…

How does violent crime in London compare to other global cities?

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The second report from the from the Independent Review of Disclosure and Fraud Offences, chaired by Jonathan Fisher KC.

Purpose Estimate the causal effect of shift timing on discretionary police behavior. We test whether patrol officers’ enforcement activity changes near the end of shift and whether stop selectivity…

Police are often becoming primary responders to people experiencing mental illness (PMI), frequently managing crises that fall outside traditional law enforcement roles. Police-PMI encounters are…

APPAM's 2026 member survey reveals how public policy researchers are using AI tools—and where confidence, training, and clear standards are falling short.

Objectives: We estimate the causal effect of school holidays on crime by exploiting the staggered timing of the Swedish winter sports break (sportlov) across municipalities. Methods: We use a…

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