By Anthony Morgan,  Timothy Cubitt,  Isabella Voce

• Using data from a large national survey of online Australians, we examined the presence of risk and protective factors for cognitive and behavioural radicalisation among individuals who participated in an anti-authority protest since early 2020.

• Anti-authority protesters exhibited more risk factors and fewer protective factors for cognitive and behavioural radicalisation than other respondents, including people who had protested in support of other issues or movements. They were also more likely to justify violence in support of their cause and willing to support or participate in violent or unlawful behaviour on behalf of their group.

• These findings show that people who participated in anti-authority protests were more vulnerable to radicalisation compared with other protestors and non-protestors. The results have implications for responding to protest movements that promote anti-government sentiment, that spread disinformation and that are exploited by malicious actors.

• AIC Research Report 31

Canberra: Australian Institute of Criminology, 2024. 62p.

By Sunyoung Pyo

The national debate about police use of force against racial minority residents has led to increased attention to body-worn cameras (BWCs) as tools for increasing police accountability. Although researchers have documented the effectiveness of BWCs, little research has been done to examine why police departments decide to use them in the first place. Based on an innovation framework, the current study aims to explain what factors determine police departments’ decisions to implement BWCs. By examining 139 U.S. police departments using event history analyses, I find that the police departments with a higher severity of police-involved deaths of minority residents and a higher strength of social movements protesting police brutality are more likely to implement BWCs. In addition, some organizational and environmental factors, including the availability of federal grants and the council-manager form of government, have significant associations with BWC implementation. Findings also suggest that different patterns of BWC implementation are demonstrated according to environmental context.

Urban Affairs Review, 58(1), 258-289. 2022

By John R. "Rick" Brown, Robin S. Engel, et al.

The Colorado Springs Police Department (CSPD) commissioned this report in partnership with the City of Colorado Springs to provide a proactive, independent systematic review of the patterns and trends associated with use of force by the CSPD. In response to Request for Proposal, Consultant Services (R20-093 IP), Assessment of Colorado Springs Police Department’s Use of Force released on July 20, 2020, the Transparency Matters, LLC (hereafter TMLLC) team was selected to complete this work. This report documents the results from comprehensive analyses of use of force incidents reported by the CSPD, specifically focusing on understanding how, when, why, and against whom officers use force, as well as the context of police encounters with the public, from both the community and officer perspectives. The purpose of this study is to examine current practices and identify opportunities to reduce the frequency and severity of use of force incidents, racial/ethnic disparities in force, and injuries to both officers and citizens through improvements to policies, training, and supervision. This report includes nine sections: (1) Introduction, (2) Review of CSPD Policies and Practices, (3) Data and Research Methods, (4) Physical Force and Weapons Used, (5) Types of Force, Force Effectiveness, and Injuries, (6) Pointing of Firearms, (7) Community Perspectives, (8) CSPD Officer Perspectives, and (9) Recommendations. This executive summary provides an overview of the primary findings from each of these report sections. 

Lancaster, PA:Transparency Matters and University of Cincinnati, 2022. 280p

By Brian Rappert, Otto Adang, Aline Daillère, Jasper De Paepe (UGent) , Abi Dymond, Marleen Easton (UGent) and Stephen Skinner

The use of force by the police and other law enforcement officers has long been a significant topic of concern, especially when it results in death. This issue and the controversies around it have recently been highlighted by a series of high-profile deaths in 2020. Police Lethal Force and Accountability assesses the frequency of deaths, and the availability and reliability of information regarding deaths, associated with the application of force by law enforcement agencies in four jurisdictions: Belgium, England & Wales, France and the Netherlands. By adopting a common set of considerations for assessing the policies and practices within these individual jurisdictions, this report enables comparisons to be made across them. In doing so, we look to provide those in policing agencies, campaigning groups, government ministries and others, with sound information with which they can identify priorities to ensure uses of force are being accurately recorded and investigated. By enabling those concerned to understand how uses of force are recorded and addressed in comparison with other jurisdictions, we hope this report will help them to build a stronger case when holding public institutions accountable and identifying points for improvement. As documented, while deaths from the use of force appear relatively rare across these four jurisdictions when compared to countries such as the US1 , the procedures 1 In the US, roughly 1,110 police killings have taken place annually over recent years, see https://mappingpoliceviolence.org/national trends, (accessed 4 December 2020). and policies for recording, investigating and disclosing details associated with deaths are wanting. The availability of official information on the number of deaths associated with the use of force, its reliability, and the extent of details collected on those that die at the hands of the state vary from country to country. While there are elements of good practice, the procedures and policies are often lacking in critical respects. As a result of such deficiencies, it is difficult to assess many important dimensions of policing, including whether some communities are disproportionality subjected to the lethal use of force. Ultimately, reducing the extent of police force requires addressing underlying societal conditions associated with employment, health, housing and education. However, more can be done by law enforcement agencies, as well as by their oversight bodies and government ministers. Assembling data and evidence that is accessible, relevant and useful to those concerned with lethal force is a necessary step to enhance accountability for, and possibly prevent, deaths. In the context of democratic societies, the police and police-related bodies not only need to act on what they know in order to learn lessons, but also to demonstrate they are doing so to the populations they are meant to serve. Every death associated with the use of force by law enforcement officials should be recorded, recognised and investigated. No one’s death should go unacknowledged and unexamined.

Exeter, UK: University of Exeter, et al. 2020. 63p.

John A. Shjarback

Objectives: To quantify nonfatal injurious police shootings of people and examine the factors associated with victim mortality.

Methods: We gathered victim-level data on fatal and nonfatal injurious police shootings from four states that have such information publicly available: Florida (2009–14), Colorado (2010–19), Texas (2015–19), and California (2016–19). For each state, we examined bivariate associations between mortality and race/ethnicity, gender, age, weapon, and access to trauma care. We also estimated logistic regression models predicting victim mortality in each state.

Results: Forty-five percent of these police shooting victims (N = 1,322) did not die. Black–white disparities were more pronounced in nonfatal injurious police shootings than in fatal police shootings. Overall, Black victims were less likely than white victims to die from their wound(s). Younger victims were less likely to die from their wound(s), as well as those who were unarmed.

Conclusions: Racial and age disparities in police shootings are likely more pronounced than previous estimates suggest.

Policy implications: Other states should strongly consider compiling data like that which is currently being gathered in California. Absent data on nonfatal injurious police shootings–which account for a large share of deadly force incidents–researchers and analysts must be cautious about comparing and/or ranking jurisdictions in terms of their police-involved fatality rates.

PLOS ONE, Nov. 2021. 14p.

By University of Chicago Law School - Global Human Rights Clinic,

This Report is being published in the midst of a long series of horrifying incidents of police abuse of power in the United States. The deaths of George Floyd, Lacquan McDonald, Eric Garner, Michael Brown, Ahmaud Arbery, Tony McDade, Regis Korchinski-Paquet, Breonna Taylor and many others, have echoed throughout the communities of this nation and prompted protests across the country. The video and testimonies from these incidents provide grim illustrations of the power law enforcement officers have over the people they are sworn to serve and protect, and the deadly consequences when they abuse that power. Society vests law enforcement with the responsibility to protect public safety and enforce the law when necessary. For these reasons, and these reasons only, law enforcement officers are granted the immense power to use force, including lethal force. This authority—state sanctioned violence—necessarily comes with limits and obligations to ensure those who enforce the law do not abuse it. These limits and obligations require that police use their power in a manner that protects and serves the entire community that has vested them with this privilege. The exercise of this authority also requires accountability when abuses occur. Without accountability, state sanctioned violence is nothing but the exercise of arbitrary brute force, a common tool of tyrannical and despotic governments. Yet, as endless reports and studies have indicated, the police in the United States do not always use their power in a manner that reflects the restraint, care and humility promised to its people. The many and terrible deaths of unarmed African Americans, the targeting of poor communities and communities of color, and the absence of a mandate to protect individuals from domestic violence, all sanctioned by the Supreme Court of the United States in the name of police discretion, have scarred many and raised questions of whether the police sufficiently serve their mandate.2

Chicago: University of Chicago Law School, 2020. 105p.

By the Nashville Community Oversight Board

National and local high-profile police killings have brought greater scrutiny to police use of force and have spurred conversations about police accountability across the country and in Nashville. As Metro Nashville Community Oversight (MNCO) itself was born from community outcry in response to multiple fatal police shootings, MNCO believes it is imperative to track and analyze trends in the Metro Nashville Police Department’s (MNPD’s) use of force and to propose policy that will reduce excessive force interactions. This report is thus the first annual use of force report that will assess the types of force used by MNPD and how frequently they are used. We will track policy implementation and make further recommendations each year. Using existing datasets provided to MNCO by MNPD weekly, MNCO researchers began investigating MNPD’s current use of force incidents and identifying patterns within these force interactions. Key findings include that Black and Hispanic subjects, both adults and youth, are more likely to be recipients of use of force (especially firearm displays and soft empty hand control techniques); white and male officers are more likely to use force; subject resistance level is a significant predictor of force used; Black people are more likely to have force used against them when they are not coded as resisting officer commands; force usage concentrates in non-white and high-poverty areas of Nashville; and youth who had force used against them by school resource officers were 96% Black and 58% female in 2023. These findings prompted the COB to make the following recommendations: MNPD should include all soft empty hand control usages (regardless of injury status), firearm displays, Taser displays, and accidental discharges in departmental use of force analyses when there is a subject present, including on MNPD’s Use of Force Dashboard. MNPD should revisit and modify its use of force training and reporting mechanisms to include more consistent tracking of resistance levels across all Form 108 types (108, 108F, 108T, and 108NC). To accomplish this, MNPD should update the MNPD Manual to define all terms in the “Subject’s NonCompliance” section in Form 108s. Further, the data provided to MNCO should be updated to reflect this change. MNPD should randomly audit instances from 2022 onward in which officers use force and resistance was not tracked, or was coded as no resistance. This is to include all Form 108, 108F, 108T, and 108NCs. If officers are determined to have used a disproportionate level of force, MNPD should take appropriate disciplinary action. MNPD should create a Peer Review Panel where supervisors or peers can anonymously report officers who they believe are involved in an above-average number of violent encounters. This panel should be supported by part-time staff who, in addition to serving on the panel, study policecommunity violence and create interventions that would combat such violence. MNPD should use a comparative method based on their force and resistance continuums to evaluate when officers are using force that is disproportionate to resistance, even when force levels are low. The establishment of such a method should be done in consultation with MNCO and with community input such that community perception of force is prioritized in MNPD’s assessment of force and resistance. This comparative method should be incorporated into MNPD’s Early Intervention System and should flag officers who repeatedly use a level of force disproportionate to resistance. Additionally, a review of each officer’s use of force from the prior year should be included in their annual performance evaluation to identify officers who are involved in a disproportionate number of force incidents or who are frequently using excessive force. MNPD should develop use of force policies and training specific to interactions with youth, modeled after best practice policies from organizations like Strategies for Youth. These policies and training should discuss de-escalation, officer presence, communication style, allowed/disallowed uses of force, disparate force across race and gender, and other topics as deemed necessary. Such policies must address that force of any kind must be consistent with the age, body size, disability status, relative strength, and risk posed by the youth. MNPD should electronically notify MNCO staff every time MNPD staff use force in Metro Nashville Public Schools. Such notification should be delivered in a monthly report that includes information including but not limited to officer name, incident number, school location, subject demographics, type of force used, and incident report narrative. MNPD should modify its implicit bias training to address the bias officers may have against entire neighborhoods based on the racial and socioeconomic makeup of those neighborhoods. These trainings should include paid representatives and trainers from the Nashville community who can serve as consultants and speak to the histories of their community and the issues they face, and should be precinct- and neighborhood-specific. MNPD should train recruits and officers in procedural justice principles, focusing on both internal and external standards. Such training should be standalone, repeated annually, and follow evidence-based standards demonstrated to be efficacious. MNPD should modify its use of force forms to include checkboxes for all de-escalation techniques (as outlined in section 11.10.030(M)) used by officers. These techniques should be tracked and analyzed as to how they relate to officer use of force. MNPD should modify its de-escalation policy and training to include specific stipulations on procedural justice. These should address active/empathetic listening, nonverbal communication, word choice, and de-escalation techniques that are grounded in procedural justice principles such as rapport-building. MNPD should continue to focus recruitment on non-white and female candidates until all ranks of the department are staffed with representation at levels significantly closer to Nashville’s demographic makeup. While this report provides a comprehensive overview of current use of force patterns within MNPD, MNCO researchers hope to continue investigations into topics such as use of force by school resource officers, the impact of precision policing tactics on use of force patterns, and community perceptions around police use of force.

Nashville, TN: Community Oversight Board, 2023. 43p

By David Klinger

What's it like to have official sanction to shoot and kill? In this brilliantly written, controversial, and compelling book, author David Klinger - who himself shot and killed a suspect during his first year as an officer in the Los Angeles Police Department - answers this and many other questions about what it's like to live and work in the place where police officers have to make split-second decisions about life and death: The Kill Zone.

Klinger, now a university professor, writes eloquently about what happens when police officers find themselves face-to-face with dangerous criminals, the excruciating decisions they have to make to shoot or to hold their fire, and how they deal with the consequences of their choices.

San Francisco. Jossey-Bass. 2004. 304p.

By Eric Piza and Victoria A. Sytsma 

  The current study applies Systematic Social observation (SSO) to body-worn camera (BWC) footage of use of physical force events in Newark, NJ. The analysis tests the effect of suspect resistance and police officer interpersonal and informational justice tactics on time until use of physical force in police-citizen encounters. The results indicate police officer actions have a greater effect on the time until physical force than does suspect resistance. Officer adherence to informational justice is negatively associated to the time until both first use of force and highest level of force. Suspect resistance did not achieve statistical significance in any model. This study has implications for research and police practice, and demonstrates the benefits of leveraging video footage in criminological research.

Crime & Delinquency 2022.

By Sébastien Cojean, Nicolas Combalbert & Anne Taillandier-Schmitt  

  Aim: Police action is frequently discussed and almost always monitored. The aim of this systematic review is to identify the psychological and social factors underlying police officers' decisions to use force. Methodology: Scientific articles were selected from six databases (PsycINFO, PsycARTICLES, Psychology and Behavioral Sciences Collection, HeinOnline, ScienceDirect, PubMed). Results We found 923 articles matching our search, and 52 were retained based on their results regarding the psychological factors underlying police officers' decisions to use force and the decision-making process itself. We found that the most frequently studied factors were belonging to an ethnic minority, carrying a conducted energy device (CED), the police department’s policies and managerial organization, and the environment in which the encounter occurred. However, it seems that the most predictive factor in the decision to use force is the resistance and behavior of the suspect.   

International Journal of Law and Psychiatry. Volume 70, May–June 2020

United States Department of Justice Civil Rights Division and United States Attorney's Office District of Minnesota Civil Division

FROM THE EXECUTIVE SUMMERY: On April 21, 2021, the Department of Justice opened a pattern or practice investigation ofthe Minneapolis Police Department (MPD) and the City of Minneapolis. By then, Derek Chauvin had been convicted in state court for the tragic murder of George Floyd in 2020. Inthe years before, shootings by other MPD officers had generated public outcry , culminating in weeks of civil unrest after George Floyd was killed. Our federal investigation focused on the police department as a whole , not the acts of any one officer. To be sure, many MPD officers do their difficult work with professionalism ,courage, and respect. Nevertheless, our investigation found that the systemic problems in MPD made what happened to George Floyd possible.

United States Department of Justice Civil Rights Division. June 16, 2023

By The Chicago’s Use of Force Community Working Group 

 This Report from community representatives of Chicago’s Use of Force Community Working Group offers our feedback on the Chicago Police Department’s (CPD) training on de-escalation and the use of force. The Working Group was first convened in the summer of 2020 in response to the requirements of the federal civil rights Consent Decree designed to bring an end to the CPD’s pattern of police brutality and racial discrimination. Over the course of two years, the Working Group persuaded the CPD to make transformative changes to its policies governing police use of force. Last fall, we issued a Public Report on CPD’s new policies, including areas still in need of change. The new policies, if implemented and enforced on the ground, have the potential to dramatically reduce unnecessary CPD violence and improve public safety. The recent murder of Tyre Nichols by members of the Memphis Police Department serves as a stark reminder of all that is at stake in Chicago. CPD’s pattern of civil rights violations, which led to the Consent Decree, persist because of a culture of violence, racism, and denial similar to the police culture that enabled officers in Memphis to believe that they could beat and kill Mr. Nichols with impunity. … 

Chicago: The Working Group, 2023. 24p.

By The U.S. Commission on Civil Rights, Washington Advisory Committee

The Washington Advisory Committee to the U.S. Commission on Civil Rights submits this briefing report regarding barriers to accountability for use of excessive force by law enforcement officers. The Committee submits this report as part of its responsibility to study and report on civil-rights issues in the state. The contents of this report are primarily based on testimony the Committee heard during public meetings held via video-conference from March to June 2021

Washington, DC: USCCR, 2022. 32p.-

By Meagan Cahill, Melissa M. Labriola, Jirka Taylor

In this report, RAND Corporation researchers summarize what is currently known about killings committed by police officers in the United States and identify existing evidence about various ways to prevent these killings. A relatively large body of research on these topics exists, but these studies often suffer from methodological shortcomings, largely stemming from the dearth of available data. Recognizing the need for more-rigorous work to guide efforts to reform police — and, more specifically, to reduce police killings — the authors present work focused on the development of a research agenda, or a road map, to reduce police killings. The report, based on an extensive literature review as well as interviews with policing experts, contains a series of recommendations for areas in which research efforts may be most effective in helping inform policy-making and decision-making aimed at reducing police killings.

The authors identified six focus areas — foundational issues (such as racial inequities, police culture, and police unions), data and reporting, training, policies, technology, and consequences for officers. Reviewing the priority research topics in each focus area, similar themes emerged, especially around the need for more-extensive and more-systematic data collection and around the use of agency policies to better govern a range of operations related to police violence, such as data collection and reporting and technology.

• More.....

  In this report, the authors use the terms police killings, police violence, and police shootings to describe these types of police behaviors, whether wrongful or not. The authors identify specific instances of these behaviors as misconduct, illegality, wrongful, or excessive when those descriptions apply.

Santa Monica, CA: RAND, 2021. 80p.

By Jyoti Belur

Extrajudicial executions by law enforcement officers have blighted parts of the world for generations, but criminological coverage has been superficial and selective. It has often been presented as a problem specific to countries associated with military rule, dictatorial regimes and colonial heritage. Permission to Shoot?: Police Use of Deadly Force in Democracies brings a new dimension to the problem of police abuse of deadly force by concentrating on the social and political settings in India and the United States, both large democracies and vibrant superpowers. The research in the book is based on primary sources—interviews with police officers of varying ranks: with those who are involved in the killings; with those who facilitate such operations, and with those who are mute spectators. The book deals with universal, fundamental themes such as: • Why is it that in a democratic country the abuse of police powers can appear to be overtly and tacitly encouraged? • What motivational techniques and justifications are used to override social norms governing moral conduct, centring on the sector of society mandated to use deadly force against civilians? • What makes ordinary, decent human beings do horrible things? Permission to Shoot? seeks to provide broad guidelines and recommendations for reforms in policing policy and practice. The research peels back the opaque communication that often surrounds this issue, but more than that it shows how that kind of communication acts to support the practice itself.

New York: Springer, 2010. 226p.

By Desmond Ang, Panka Bencsik, Jesse Bruhn and Ellora Derenoncourt

How do high-profile acts of police brutality affect public trust and cooperation with law enforcement? To investigate this question, we develop a new measure of civilian crime reporting that isolates changes in community engagement with police from underlying changes in crime: the ratio of police-related 911 calls to gunshots detected by ShotSpotter technology. Examining detailed data from eight major American cities, we show a sharp drop in both the call-to-shot ratio and 911 call volume immediately after the police murder of George Floyd in May 2020. Notably, reporting rates decreased significantly in both non-white and white neighborhoods across the country. These effects persist for several months, and we find little evidence that they were reversed by the conviction of Floyd’s murderer. Together, the results illustrate how acts of police violence may destroy a key input into effective law enforcement and public safety: civilian engagement and reporting.

Cambridge, MA: Working paper, Harvard Kennedy School, 2021. 27p.

By Shelley Hyland, Lynn Langton and Elizabeth Davis

This report presents data on the threat or use of nonfatal force by police against white, black, and Hispanic residents during police contact. This report describes the characteristics of the contact, the type of force threatened or used, and the perceptions that force was excessive or the police behaved properly during the contact. It also examines trends in the threat or use of force and the relationship between officer and driver race and Hispanic origin in traffic stops involving the threat or use of force. Data are from the 2002, 2005, 2008, and 2011 Police- Public Contact Surveys, which were administered as supplements to the National Crime Victimization Survey.

Washington, DC: U.S. Department of Justice Office of Justice Programs Bureau of Justice Statistics, 2015. 17

By Tanaya Devi and Roland G. Fryer, Jr.

This paper provides the first empirical examination of the impact of federal and state "Pattern-or-Practice" investigations on crime and policing. For investigations that were not preceded by "viral" incidents of deadly force, investigations, on average, led to a statistically significant reduction in homicides and total crime. In stark contrast, all investigations that were preceded by "viral" incidents of deadly force have led to a large and statistically significant increase in homicides and total crime. We estimate that these investigations caused almost 900 excess homicides and almost 34,000 excess felonies. The leading hypothesis for why these investigations increase homicides and total crime is an abrupt change in the quantity of policing activity. In Chicago, the number of police-civilian interactions decreased by almost 90% in the month after the investigation was announced. In Riverside CA, interactions decreased 54%. In St. Louis, self-initiated police activities declined by 46%. Other theories we test such as changes in community trust or the aggressiveness of consent decrees associated with investigations -- all contradict the data in important ways.

Cambridge, MA: National Bureau of Economic Research, 2020. 673p

By Carl Lieberman

I examine how racial disparities in police use of force vary using new data covering every municipal police department in New Jersey. Along the intensive margin of force, I find disparities that disfavor Black subjects and are larger at higher force levels, even after adjusting for incident-level factors and using new techniques to limit selection bias. I then extend empirical Bayes methods to estimate department-specific racial disparities and observe significant differences across and within these hundreds of departments. Finally, I find that certain municipal factors are useful predictors of whether a department has a large racial disparity against Black civilians, but the most informative variables can change when considering different levels of force. These findings suggest that ignoring heterogeneity in police use of force misrepresents the problem and masks the existence of both departments with very large disparities and those without apparent disparities against Black civilians, but the variation even within departments may make identifying and treating inequitable departments difficult.

Washington, DC: Center for Economic Studies, U.S. Census Bureau , 2022. 71p.

By Lynn Langton and Matthew Durose

Examines the characteristics and experiences of persons age 16 or older who were stopped by police during traffic and street stops, and their perceptions of police behavior and response during these encounters.

Examines the characteristics and experiences of persons age 16 or older who were stopped by police during traffic and street stops, and their perceptions of police behavior and response during these encounters. It describes the outcomes of traffic and street stops by the reason for the stop; demographic characteristics of the persons stopped; race or Hispanic origin of the officers; and whether a ticket was issued, a search was conducted, or force was used. It also describes variations in perceptions of the police across characteristics and outcomes of traffic and street stops. Data are from the 2011 Police-Public Contact Survey, a supplement to the National Crime Victimization Survey, which collects information from a nationally representative sample of persons in U.S. households on contact with police during a 12-month period.

Washington, DC: U.S. Bureau of Justice Statistics, 2013. 22p.