A Forgotten Classic of Criminological Thought—Reintroduced for the Twenty-First Century

Originally published in 1918 and now carefully edited and introduced by Graeme R. Newman, The Criminology of Crime and Criminals: Medical, Biological and Psychological restores Charles Mercier’s groundbreaking exploration of crime, punishment, criminal behavior, and social order.

Long before modern criminology embraced concepts such as situational crime prevention, environmental opportunity, offender decision-making, and restorative justice, Mercier argued that crime cannot be explained by biology, psychology, or environment alone. Instead, criminal behavior emerges from the interaction between human nature and circumstance, between personal disposition and criminal opportunity.

Rejecting the popular theories of his day, Mercier challenges the notion of the “born criminal” and dismisses simplistic environmental explanations of lawbreaking. His provocative and highly original analysis examines:

• The psychological foundations of criminal conduct

• The roles of instinct, reason, desire, self-control, and will

• How opportunity and temptation shape criminal action

• The classification of crimes and criminals

• The relationship between crime, morality, and society

• The purposes of punishment: deterrence, retaliation, reform, and reparation

• The prevention, detection, and punishment of crime

Mercier’s central insight—that criminals are not a separate species but ordinary human beings responding differently to circumstances—remains strikingly relevant more than a century later.

Graeme R. Newman’s contemporary introduction places Mercier within the broader history of criminological thought and connects his ideas to modern developments in crime prevention and criminal justice. Together, Mercier and Newman illuminate enduring questions that continue to shape public policy and scholarly debate:

Why do people commit crimes? How should society respond? Is prevention more effective than punishment?

Part intellectual history, part criminological theory, and part social philosophy, this edition offers a fascinating window into the origins of modern criminology and the continuing struggle to understand crime and criminals.

Essential reading for students and scholars of criminology, criminal justice, sociology, psychology, legal history, and anyone interested in the causes of crime and the future of punishment.

Read-Me.Org Inc. New York-Philadelphia-Australia. 2026. 195p.

by Graeme Newman (Editor), Charles Mercier (Author)

Why do people commit crime? When does mental illness diminish responsibility? Should punishment always follow wrongdoing?

More than a century before modern debates about criminal responsibility, forensic psychiatry, and the treatment of mentally ill offenders, the distinguished British physician Charles Mercier confronted these enduring questions with remarkable clarity and originality.

In Crime, Insanity and Affliction, Mercier explores the complex relationship between criminal behaviour, mental disorder, and human suffering. Rejecting simplistic explanations, he argues that crime cannot be understood apart from the biological, psychological, and social forces that shape human conduct. His examination ranges from drunkenness, epilepsy, intellectual disability, and mental illness to questions of moral responsibility, punishment, and the proper role of the criminal law.

Although written in the early twentieth century, many of Mercier's observations anticipate debates that continue today. His discussion of diminished responsibility, the treatment of mentally ill offenders, addiction, and the limits of punishment remains surprisingly relevant in an era still struggling to balance justice, compassion, and public safety.

This new Read-Me edition presents Mercier's influential work with a new editorial introduction that places his ideas within the development of modern criminology, forensic psychiatry, and criminal justice. It also examines where Mercier's conclusions have been confirmed, where later research has challenged them, and why his work continues to deserve the attention of students, scholars, and general readers alike.

More than a historical curiosity, Crime, Insanity and Affliction is a thoughtful exploration of one of society's oldest and most difficult questions: how should we judge those whose minds, circumstances, or afflictions place them beyond the ordinary boundaries of responsibility?

Read-Me.Org Inc. New York-Philadelphia-Australia. 2026. 182p.

A Forgotten Classic of Criminological Thought—Reintroduced for the Twenty-First Century

Originally published in 1918 and now carefully edited and introduced by Graeme R. Newman, The Criminology of Crime and Criminals: Medical, Biological and Psychological restores Charles Mercier’s groundbreaking exploration of crime, punishment, criminal behavior, and social order.

Long before modern criminology embraced concepts such as situational crime prevention, environmental opportunity, offender decision-making, and restorative justice, Mercier argued that crime cannot be explained by biology, psychology, or environment alone. Instead, criminal behavior emerges from the interaction between human nature and circumstance, between personal disposition and criminal opportunity.

Rejecting the popular theories of his day, Mercier challenges the notion of the “born criminal” and dismisses simplistic environmental explanations of lawbreaking. His provocative and highly original analysis examines:

• The psychological foundations of criminal conduct

• The roles of instinct, reason, desire, self-control, and will

• How opportunity and temptation shape criminal action

• The classification of crimes and criminals

• The relationship between crime, morality, and society

• The purposes of punishment: deterrence, retaliation, reform, and reparation

• The prevention, detection, and punishment of crime

Mercier’s central insight—that criminals are not a separate species but ordinary human beings responding differently to circumstances—remains strikingly relevant more than a century later.

Graeme R. Newman’s contemporary introduction places Mercier within the broader history of criminological thought and connects his ideas to modern developments in crime prevention and criminal justice. Together, Mercier and Newman illuminate enduring questions that continue to shape public policy and scholarly debate:

Why do people commit crimes? How should society respond? Is prevention more effective than punishment?

Part intellectual history, part criminological theory, and part social philosophy, this edition offers a fascinating window into the origins of modern criminology and the continuing struggle to understand crime and criminals.

Essential reading for students and scholars of criminology, criminal justice, sociology, psychology, legal history, and anyone interested in the causes of crime and the future of punishment.

Read-Me.Org Inc. New York-Philadelphia-Australia. 2026. 195p.

The book that criminology forgot — and urgently needs to remember.
Arthur M<ercier (Author). Graeme Newman (Editor and Introduction).

First published in 1918 by the University of London Press, Charles Arthur Mercier's Conduct and Its Disorders, Biologically Considered, published by Macmillan in 1911 is one of the most rigorous, most readable, and most unjustly neglected works in the history of criminological thought. Now reissued as The Biology of Conduct Disorders, with a major critical introduction by Graeme R. Newman, it arrives at a moment when the questions it raises — about criminal intent, biological disposition, the limits of punishment, and the poverty of criminological theory — are more pressing than ever.
Mercier was no armchair theorist. As medical officer of lunatic asylums, consulting physician at criminal trials, and the only systematic student of conduct as a science, he brought to the study of crime a combination of clinical experience and biological rigour that the field had not seen before and has rarely matched since. His target was the prevailing chaos of criminological thought — above all the Continental school of Lombroso, which he dismantled with surgical precision — and his method was the application of praxiology, his own science of conduct, to the specific problem of criminal action.

What Mercier argued — and why it still matters:

• Every criminal act is the product of two factors: an internal factor (the biological constitution of the offender) and an external factor (circumstance and opportunity). Ignoring either produces not criminology but ideology.

• The turpitude of the criminal and the gravity of the crime are entirely separate questions — and confusing them has produced centuries of unjust punishment.

• Punishment should be calibrated to intention, not outcome: the man who intends murder and fails is more culpable than the man who kills by accident, whatever the body count.

• Statistical criminology — mass data gathered from convicted prisoners — cannot produce a science of crime. Only the study of individual criminal action, grounded in biology, psychology, and jurisprudence together, can do that.

• Certain acts currently outside the law (stealing the use of a thing; deliberate breach of contract) deserve criminal status; certain acts currently criminalised do not.

This new edition includes a critical introduction by Graeme R. Newman, Distinguished Professor Emeritus at the School of Criminal Justice, University at Albany, and one of the most provocative and original voices in the study of crime, deviance, and punishment. Author of Comparative Deviance: Perception and Law in Six Cultures, The Punishment Response, Just and Painful: A Case for the Corporal Punishment of Criminals, and Civilization and Barbarism: Punishing Criminals in the Twenty-First Century — and, as Colin Heston, of darkly satirical fiction including The Tommie Felon Show, Miscarriages, and Holy Water — Newman brings a unique authority to this text. Writing with the unflinching directness that earned him national television appearances and a reputation as the most uncomfortable conscience in American criminology, he traces the connections between Mercier's 1918 arguments and the debates that have defined — and divided — the field ever since.
"With the exception of logic, there is no subject on which so much nonsense has been written as this of criminality and the criminal." — Charles Arthur Mercier, 1918
Essential reading for students and scholars of criminology, criminal justice, the history of psychiatry, legal theory, and the philosophy of punishment — and for anyone who has ever wondered why, after two centuries of criminal science, we understand so little about why people commit crimes and what we should do about it.

Read-Me.Org Inc. New York-Philadelphia-Australia. 2026. 208p.

By Maureen Taylor ahd Lesley McMillan 

  There is a significant body of research that illustrates the emotional demands of policing and the physical and psychological toll this takes on officers and staff. However, the management of these demands, particularly in more specialist roles such as those in public protection policing where the demand may be higher, are less well understood. This research explores the experiences of public protection police officers in Police Scotland through a lens of emotional labour..  The aims of this research were to: • Critically review the literature around the emotional impacts of policing on officers and the role of emotional labour in policing; • Establish the experience of, and impact on, officers involved in the investigation of public protection cases; assess how police officers in roles where emotional labour may be heightened, manage their emotions and the strategies they develop to do so; and • Examine how emotions and emotion management are mediated by organisational, departmental and role values, demands and culture In doing so, the research sought to answer the following research questions: 1. What is the emotional experience of police officers in public protection roles and what impact does it have on them? 2. What emotional labour do officers undertake, and what strategies of emotion management do officers employ? 3. To what extent does the theory of emotional labour explain the experiences of public protection police officers? 4. What role does the prevailing organisational culture play in the emotion management strategies of public protection policing? This report presents the findings from this research and a potential framework for understanding the factors that contribute to resilience within the context of public protection policing    

Edinburgh: Scottish Institute for Policing Research 2025. 32p.   

By Lauren Lyons  

  he alarming recurrence of unjustified killings by police highlights systemic issues that should be deeply concerning to us all. Beyond excessive use of force, the police treat marginalized people in disproportionately harmful ways that reflect and perpetuate endemic injustice; they respond inappropriately to complex social and public health problems like homelessness, addiction, and mental illness, risking harmful escalation and exacerbating underlying issues. Police culture tends towards cynical authoritarianism, adopting an “us-versus-them” mentality that positions (at least a subset of) citizens as adversaries. All of this has resulted in severely diminished public trust in the police, fraught police-community relations, and rising skepticism of the legitimacy of policing institutions. Public outcry over these problems has catalyzed the ongoing Black Lives Matter movement. The police murder of George Floyd was followed by mass protests in the summer of 2020, and since then, there has been widespread public debate on how to mitigate police violence and the distrust it engenders. Some call for incremental reforms, like changing laws and policies governing police use of force or strengthening misconduct reporting and decertification processes. Others demand that we reimagine the role of policing in our institutional landscape, reallocating powers, resources, and responsibilities from the  police to other institutions. The goal of this paper is to refine and defend this reallocative demand, which I refer to as the unbundling proposal. There has been a promising uptick in philosophical discussions of policing in recent years. Some focus on principles to guide police conduct, often drawing on theories of self-defense and professional ethics. Philosophers also propose measures to address police misconduct such as expanding legal statutes to outlaw harmful tactics, revoking the licenses of bad actors, providing reparations to victims of police violence, implementing self-evaluation and evidence-based improvements to departmental policy, restructuring police departments, broadening police participation in harm reduction and other forms of nonviolent order maintenance, and avoiding tactics that heighten the risk of illegitimate policing. These strategies, especially when combined, can improve policing. Rather than a discussion of their comparative merits and disadvantages, I present and defend an alternative ameliorative approach. The unbundling proposal asks not how police should act but rather what the scope of policing should be: Which situations require police presence? In the ethics of war, we distinguish between jus in bello (the ethics of conduct in war) and jus ad bellum (the ethics of whether war is justified). The unbundling proposal addresses an issue that is analogous to jus ad bellum considerations: when police should be deployed (instead of how they should behave). This approach complements rather than conflicts with many proposed reforms, but it also addresses a broader and less examined issue. Moreover, despite substantial public support, there has been no sustained discussion of unbundling in analytic ethics and political philosophy, and the attention the proposal has received is largely critical. The unbundling proposal is connected closely to movements to defund and eventually abolish the police. The slogan “defund the police” really means “defund and refund,” with activists calling for cutting police funding and reallocating it to other nonpolice institutions and community organizations. As such, “defund, refund” is one public finance-focused component of the broader unbundling proposal. For abolitionists, unbundling and other measures that reduce the scope and power of the police are critical steps toward ultimately dismantling the institution. Though I am not defending abolition here, the discussion should (1) clarify the practical action strategy of police abolitionists and (2) offer a more robust and appealing picture of the defund demand. The structure of this paper is as follows. In section 1, I present the unbundling proposal, identifying the specific dimensions of policing that proponents argue should be unbundled and reallocated. There I also discuss the definition of policing upon which unbundling is based. Then, I present a novel set of normative arguments for unbundling that reflect various rationales emanating from policing-critical social movements. The case for unbundling is strongest if we take them in tandem. The first two arguments (section 2) draw on principles of institutional design. I argue first that we should unbundle policing because public institutions with violent capacities should have narrow mandates; nonviolent, noncoercive responses to social problems should be the default. I then claim that unbundling constitutes a better distribution of epistemic labor. Catchall order-maintenance policing is epistemically overdemanding, while more narrowly defined roles foster better expertise and outcomes. The argument in section 3 centers on the effects of policing in unequal societies with historical injustice—specifically, how policing disproportionately burdens Black people, other people of color, and members of marginalized groups, driving structural injustice. I aim to reconstruct one argumentative thread that leads us from (1) these unfair effects to (2) the unbundling proposal. In doing so, I address the broader question of what forms of solutions are appropriate when institutions are infected with injustice, suggesting that in this case and others, justice-undermining effects require us to turn towards extra-institutional, reallocative measures. My hope is that the paper will be interesting for skeptics and advocates of unbundling and related proposals, adding some clarity to divisive debates and expanding the library of solutions to the pressing problems with policing defended within philosophy 

Journal of Ethics and Social Philosophy

By The Policing Project at NYU School of Law 

  The story of the Chicago Neighborhood Policing Initiative begins in 2019. At that time, the City of Chicago faced a number of serious challenges involving crime and community confidence in the police. Decades-long concerns about discriminatory policing, police accountability, use of force, external oversight, and community responsiveness had reached a critical point that demanded action. Following the police shooting of Laquan McDonald, the United States Department of Justice investigated and found a pattern or practice of unconstitutional policing by the Chicago Police Department (CPD), linking a lack of public trust to reduced crime prevention effectiveness. Within this environment, CPD personnel visited New York City to learn about the New York Police Department’s (NYPD) recently developed Neighborhood Policing model. That approach focused on reorganizing patrol activities in police districts to allow officers to engage meaningfully with the community and address local issues. The NYPD credited this method with enhancing community involvement and revitalizing focus on community policing. It is worth noting that Chicago’s original, groundbreaking community policing model, the Chicago Alternative Policing Strategy (CAPS), shared many features with the NYPD model, such as promoting partnership with community. But CAPS became under-resourced over time and today is a stand-alone program focused on community events rather than crime strategy. Identifying the NYPD model as a promising approach to improving public safety and relationships with the community, CPD leadership asked the Policing Project at New York University School of Law to work with the Department and local communities to develop a strategy to re-imagine the NYPD model to meet the needs and particular challenges of Chicago. Since 2019, the Policing Project has been supporting the development and implementation of the model, made possible by the partnership of a dedicated coalition of Chicago philanthropic organizations. The Neighborhood Policing Initiative (NPI) is a core policing strategy focused on problem-solving and crime reduction activities, undertaken in collaboration with neighborhood residents in a manner that builds trust between police and community. Through NPI, the community and the police share responsibility for addressing public safety issues in communities. NPI’s goal is to transform the community-police dynamic to produce meaningful public safety. Rather than solely relying on traditional police responses, NPI seeks to bring together Chicago communities to identify problems and develop solutions to guide police efforts going forward.  NPI’s vision is for this philosophy to permeate every level of the Department, equipping CPD and the communities it serves to reach a shared understanding of what policing should look like. Under NPI, residents are an ongoing, central part of the actual decision-making process on how they are policed.

New York: NYU University School of Law, Policing Project, 2025. 118p.   

By Katherine Hoogesteyn, Meret S. Hofer, Travis A. Taniguchi, and Jennifer R. Rineer

  Maintaining adequate staffing levels to ensure public safety is a critical challenge for law enforcement agencies, especially with rising officer turnover driven by sociopolitical factors and changing workforce demographics. This narrative review examines strategies to enhance officer retention by synthesizing findings from both policing and related fields. These strategies are organized into five categories: (1) compensation and financial incentives, (2) career development and professional growth, (3) workplace environment and support, (4) wellness and resilience, and (5) feedback and organizational learning. The review underscores the importance of context-specific, tailored approaches and calls for rigorous studies to evaluate the implementation and effectiveness of these strategies. Recommendations include adapting organizational structures to foster innovative retention strategies, optimizing resource management, and implementing continuous evaluation processes to promote sustained officer retention.  

  RTI Press Publication No. OP-0096-2503. Research Triangle Park, NC: RTI Press.2025. 22p.

By Vladas Tumalavičius

The recent illegal drugs market trends are connected with the flow of new psychoactive substances also through internet resources. Consequently, the states intensified its legislative initiative in this field. In addition there is a current trend related to the use of smuggled controlled substances and new psychoactive substances, illegal cultivation of marijuana as well as the involvement our countries citizens in the trafficking of narcotic substances. The problem of drug addiction has become very topical as an ever increasing number of youth who are involved in narcotics could become a threat to each and every one of us and security of society as a whole. This case study is devoted to the study of the transformation of approaches to ensuring the safety of society and combating drug trafficking at the international level. The aim of this study is to consider the general problem of drug trafficking as a challenge to modern international security and international economics development. The object of the study is the mechanism of combating drug trafficking at the stage of sustainable development. The analytical method, the method of situational analysis, the comparative method, theoretical studies and specific legal research methods were used as methods in the study as methods used in the social sciences to study objective reality. The methodological approach of the study is constructivism and social constructivism. On the one hand, the analysis of the formation of a global regime of non-coercive solution to the problem of drug trafficking requires a constructive analysis. On the other hand, the problems of global governance are best developed today mainly by constructivism. Finally, this case study testifies to the global dominance of shadow entrepreneurs in narco-states and their participation in illegal drug trafficking bypassing the participation of state institutions and confirms the assumption put forward about the lack of implementation of measures to counter this phenomenon on the part at the state level.

Access to Science, Business, Innovation in Digital Economy ISSN 2683-1007 (Online) 2023, 4(3), 409-418

By Sami Aftab Abdul , Huan Jiang , .Cayley Russell  , Tara Elton-Marshall ,  et al.

Background

British Columbia, Canada implemented a three-year pilot program on January 31, 2023 decriminalizing personal possession of select illegal drugs. The policy aimed to increase access to health and social services. This analysis evaluated the short-term impacts of decriminalization on clients dispensed opioid agonist treatment (OAT) medications and visits to supervised consumption and overdose prevention services (SCS/OPS).

Methods

Population-based data from 2015 to 2023 were sourced (Pre-decriminalization: Jan 2015–Jan 2023; Post-decriminalization Feb 2023–Dec 2023). Generalized additive models in an interrupted time series design were used to model monthly total and sex-stratified, age-standardized rates of clients and first-time clients dispensed OAT medications per 100,000 population, as well as crude rates of visits to SCS/OPS per 100,000 population. The models tested both immediate level changes (immediate effect at decriminalization) and trend changes (slope changes post-decriminalization).

Results

The models detected no association between decriminalization and changes in clients dispensed OAT medications (Immediate Change β [95 % CI]: −0.001 [−0.012, 0.011]; Trend Change β [95 % CI]: −0.004 [−0.011, 0.003]), first-time clients dispensed OAT medications (Immediate Change β [95 % CI]: 0.115 [−0.049, 0.279]; Trend Change β [95 % CI]: −0.006 [−0.048, 0.035]) or visits to SCS/OPS (Immediate Change β [95 % CI]: 0.048 [−0.100, 0.195]; Trend Change β [95 % CI]: 0.013 [−0.016, 0.043]). Findings for all outcomes remained consistent after stratifying by sex.

Conclusion

Decriminalization was not associated with changes in clients dispensed OAT medications, first-time clients dispensed OAT medications, or visits to SCS/OPS. These findings reflect only the initial eleven months following the implementation of the policy. Given the complexity of factors influencing service utilization, and the introduction of the second amendment which represents a significant rollback of the original exemption, longer-term evaluations are needed to more accurately assess whether decriminalization is contributing to its intended goals.

Journal of Substance Use and Addiction Treatment

Volume 180, January 2026, 209815

By  Sandra J. Ley Gutiérre

When do protests against crime and insecurity take place, regardless of the risks that such mobilization may entail? This paper argues that while violence provides an initial motivation for participating in protests, social networks play a fundamental role in incentivizing citizen mobilization against insecurity. Socialization within networks helps generate solidarity and empathy among participants, while at the same time transforming emotions associated with living in a violent context into potential for action. Also, through networks, individuals share information about opportunities for collective action and change their perceptions about the effectiveness and risks of such activism. These distinct mechanisms are valuable for the activation of protest against crime across levels of violence. Supporting evidence is derived from an original dataset on protest events in reaction to violence in Mexico between 2006 and 2012. Additionally, I rely on qualitative in-depth interviews and participant observation to illustrate the role of networks in protest against crime across several Mexican states. This paper contributes to the growing literature on criminal violence and political participation.Notre Dame, IN: The Kellogg Institute for International Studies
University of Notre Dame, 2022.

By Eric Hershberg, Edward Maguire, Steven Dudley

In October 2012, the U.S. government designated MS-13 as a transnational criminal organization (TCO), raising serious questions about the breadth of the gang’s criminal capacity. Some analysts have pointed to a steady growth and professionalization of this criminal organization, but insufficient data has hindered the formulation and implementation of policies aimed at countering this trend. Our multiyear project proposed to fill gaps in the extant literature by conducting qualitative and quantitative research designed to assess MS-13’s transnational criminal capacity. More specifically, our objectives were to: 1) conduct extensive interviews with local stakeholders, gang experts, and MS-13 members in three major metropolitan areas, including two in the U.S. and one in El Salvador; 2) analyze qualitative and quantitative data gathered through tested survey and interview instruments and from official sources, with particular attention to the following factors: type of criminal activities, organizational structure, inter- and intra-gang relationships, level of community penetration, accumulation of social capital, development and migration patterns, and recruitment strategies; 3) utilize social network analysis techniques to quantify the social reach of gang member respondents; and 4) disseminate project findings to relevant constituencies in law enforcement, policymaking circles, academe, and the general public. The purpose of our research was to provide policymakers and law enforcement officials with a comprehensive understanding of MS-13 by measuring the extent and range of the organization’s criminal activity and mapping its social networks. Our goal was to generate empirical data that could serve as a foundation upon which to shape new policies and practices. Specifically, our hope was that the data would provide insights regarding the optimal allocation of law enforcement resources, the likely movements of MS-13, and the design of intervention and suppression strategies. 

Washington DC: U..S. Department of Justice,  2019. 11p.

By: Megan T. Stevenson and Robynn J.A. Cox

This Article tells the story of the birth of predictive algorithms in criminal justice. Known as risk assessments, these tools are widely used today to make decisions about bail, sentencing, and parole. Their roots trace back to the 1920s, when statistical prediction tools were first proposed for use in criminal justice decision-making. In this Article, we show that risk assessment found its origins in the ideas of eugenic criminology: namely, that crime is mostly caused by an inferior subclass of humanity, tainted from birth. Risk assessment was conceptualized as a way of sorting between the “normals” who were amenable to reform and the “sub-normals” who, due to their inferior genes, were not. Such “born criminals” were seen as requiring indefinite confinement within isolated penal colonies in order to protect society from crime, prevent procreation, and provide care for those in need of paternalistic guidance. We tell this story in part because it is a fascinating piece of history, marked by bigotry, bravado, and an almost fanatical optimism about mankind’s ability to engineer a perfect society. But we also tell it because the ideas and practices of eugenic criminology are not widely known. While “tainted origins” do not automatically condemn the ongoing use of risk assessment, understanding history can help identify ways that the past lives on in the present.

By James Lewis, Sarah Marsden, James Hewitt, Chloe Squires, Anna Stefaniak

Reliability and Validity of Risk Assessment Tools for Violent Extremism: A Systematic Review

By Sébastien Brouillette-Alarie, Ghayda Hassan, Wynnpaul Varela, Emmanuel Danis, Sarah Ousman, Pablo Madriaza, Inga Lisa Pauls, Deniz Kilinc, David Pickup, Robert Pelzer, Eugene Borokhovski, the CPN-PREV team

Assessment of the risk of engaging in a violent radicalization/extremism trajectory has evolved quickly in the last 10 years. Guided by what has been achieved in psychology and criminology, scholars from the field of preventing violent extremism (PVE) have tried to import key lessons from violence risk assessment and management, while bearing in mind the idiosyncrasies of their particular field. However, risk tools that have been developed in the PVE space are relatively recent, and questions remain as to their level of psychometric validation. Namely, do these tools consistently and accurately assess risk of violent extremist acting out? To answer this question, we systematically reviewed evidence on the reliability and validity of violent extremism risk tools. The main objective of this review was to gather, critically appraise, and synthesize evidence regarding the appropriateness and utility of such tools, as validated with specific populations and contexts. Searches covered studies published up to December 31, 2021. They were performed in English and German across 17 databases, 45 repositories, Google, other literature reviews on violent extremism risk assessment, and references of included studies. Studies in all languages were eligible for inclusion in the review. We included studies with primary data resulting from the quantitative examination of the reliability and validity of tools used to assess the risk of violent extremism. Only tools usable by practitioners and intended to assess an individual's risk were eligible. We did not impose any restrictions on study design, type, method, or population. We followed standard methodological procedures outlined by the Campbell Collaboration for data extraction and analysis. Risk of bias was assessed using a modified version of the COSMIN checklist, and data were synthesized through meta-analysis when possible. Otherwise, narrative synthesis was used to aggregate the results. Among the 10,859 records found, 19 manuscripts comprising 20 eligible studies were included in the review. These studies focused on the Terrorist Radicalization Assessment Protocol (TRAP-18), the Extremism Risk Guidance Factors (ERG22+), the Multi-Level Guidelines (MLG-V2), the Identifying Vulnerable People guidance (IVP guidance), and the Violent Extremism Risk Assessment (VERA)—all structured professional judgment tools—as well as Der Screener—Islamismus, an actuarial scale. Studies mostly involved adult male participants susceptible to violent extremism (N = 1106; M = 58.21; SD = 55.14). The types of extremist ideologies endorsed by participants varied, and the same was true for ethnicity and country/continent of provenance. Encouraging results were found concerning the inter-rater agreement of scales in research contexts (kappas between 0.76 and 0.93), but one of the two studies that examined it in a field setting obtained disappointing results (kappas ranging between of 0.47 and 0.80). Content validity studies indicated that PVE risk tools adequately cover the risk factors and offending processes of individuals who go on to commit extremist violence. Construct validity analyses were few and far between, with results indicating that empirical divisions of scales did not match their conceptual divisions. The internal consistency of subscales was lackluster (Cronbach's alphas between 0.19 and 0.85), whereas full scales demonstrated acceptable internal consistency when assessed (0.80 for the ERG22+ and 0.64 for the IVP guidance). Only one study examined convergent validity, and it revealed a lack of convergence, primarily due to particularities of the scale under study (the MLG-V2). Discriminant validity analyses were exploratory in nature, but suggested that PVE risk tools might not be ideology-specific and may apply to both group and lone actors. Finally, although the TRAP-18 showed a relatively strong postdictive effect size (pooled r = 0.62 [0.35–0.77], p = 0.000), the results were highly heterogeneous (I2 = 86%), and all studies used retrospective designs, meaning the outcome was already known at the time of assessment. As such, no included study evaluated true predictive validity (i.e., the ability to forecast future violent extremist outcomes based on prospective risk assessment). This represents a significant evidence gap. Threats to validity were substantial: (a) Many studies were case studies or had very small samples, (b) nearly all samples were constituted through the triangulation of publicly available data, and (c) convenience outcome measures were often used. Although having imperfect data is better than having no data, the current state of empirical validation precludes the recommendation of one tool over another for specific populations and contexts, and calls for higher-quality validation studies for PVE risk assessment tools. Nevertheless, these tools constitute useful checklists of relevant risk and protective factors that could be taken into account by evaluators who wish to assess the risk of violent extremism and identify intervention targets.

Campbell Systematic Reviews, Volume21, Issue4

December 2025, 2025.

By Michelle Kondo , Michelle Degli Esposti , Jonathan Jay etc.

Neighbourhood environments are a known social determinant of health. Vacant and abandoned buildings and lots and poor or hazardous housing conditions, combined with crime and violence, can affect residents’ health and wellbeing. Nationwide Children’s Hospital and its partners launched the Healthy Homes initiative in 2008, which sought to improve nearby residents’ health and wellbeing by rejuvenating vacant and abandoned properties and increasing homeownership in the South Side neighbourhood of Columbus, Ohio. Between 2008 and mid-2019 the initiative funded 273 repairs or renovations in this neighbourhood. We conducted a ZIP-code-level comparative case study of the Healthy Homes housing interventions using synthetic control methodology to evaluate changes in crime rate in the intervention area compared with those in a synthetic control area. While findings were mixed, we found some evidence of reduced thefts in the Healthy Homes area, relative to its synthetic control. This initiative to repair, rebuild and increase ownership of housing has the potential to reduce crime rates for neighbours of the Nationwide Children’s Hospital.  

By Li Sian Goh, Michael Rempel, and Joanna Weill

This report examines the alignment of New York City judges’ pretrial release decisions with the recommendations of the Pretrial Release Assessment, a validated tool that calculates the likelihood people will return to court if they are released before trial. Drawing on 251,917 New York City arraignments subject to pretrial release decisions in 2021, 2022, and 2023, we looked at what the assessment recommended, how often judges followed these recommendations, and cross-borough differences over time.

Key Findings:

Most People are Recommended for Release on Recognizance (ROR): From 2021 to 2023, the Release Assessment recommended releasing people on their own recognizance (ROR) for 88% of cases, including 79% of violent felonies, 77% of nonviolent felonies, and 92% of misdemeanors. Yet judges granted ROR in only 25% of violent felonies, 42% of nonviolent felonies, and 78% of misdemeanors.The Assessment Was Consistent Across Each Race/Ethnicity: The assessment recommended 87% of Black, 88% of Hispanic, and 85% of white people for ROR. For people charged with a violent felony, the assessment recommended a statistically identical 78% of Black and Hispanic and 77% of white people for ROR.Alignment with the Release Assessment’s Recommendations: From 2021 to 2023, judges infrequently followed ROR recommendations for violent felony cases (30%), only followed such recommendations about half the time (51%) in nonviolent felony cases, while adhering at a high rate for misdemeanors (83%). Conversely, in violent felony cases that are virtually all legally eligible for bail under the State’s bail reform law, judges set bail or remand in 41% of the cases where the Release Assessment had recommended ROR.Judges Aligned with the Assessment at Racially Disparate Rates: When the assessment recommended ROR in a violent felony case, judges set it least often for Black people (26%), somewhat more for Hispanic people (32%), and most often for white people (43%). In these same cases, judges were more likely to impose bail or remand on Black (44%) than Hispanic (39%) or white people (29%). Further analysis linked these racial differences to a tendency of judges to overrate certain risk factors correlated with race/ethnicity.Overrating Certain Risk Factors: Although criminal history and living situation are already factored into the assessment’s recommendations, judges were more likely to adhere to a ROR recommendation when people had no prior warrants, no prior misdemeanor or felony convictions, and a stable abode than when one of these risk factors was present.Alignment Varied Across the City: Bronx and Brooklyn judges followed a ROR recommendation at the highest and Staten Island judges at the lowest rate. Nonviolent felonies saw especially wide borough variability. (For example, people facing a nonviolent felony charge and recommended for ROR were 1.8 times more likely to receive it in the Bronx than in Manhattan or Staten Island.)

By Amnesty International
This report presents Amnesty International’s findings from a research trip to southern Florida in September 2025, to document the human rights impacts of federal and state migration and asylum policies on mass detention and deportation, access to due process, and detention conditions since President Trump took office on 20 January 2025. In particular, it focuses on detention conditions at the Krome North Service Processing Center (Krome) and the Everglades Detention Facility, also known as “Alligator Alcatraz”.

By Brandon Martinez, Rebecca Tublitz, Otgonjargal Okhidoi (Otgo), Emily West

The majority of people in local jails around the country are awaiting their criminal trial, meaning they have not been convicted of the crimes that brought them in, and many of them do not pose a danger to public safety. In fact, keeping those in jail who could be better served in the community can cause long-term instability.  

Given this research, cities and counties involved in the Safety and Justice Challenge (SJC) have engaged in collaborative, multi-agency efforts to safely reduce the misuse and overuse of their local jails and increase equity across the system.  

These efforts have yielded impressive results: in these SJC cities and counties, nearly 18,000 fewer people are in jails today compared to the start of the initiative.

By National Academies of Sciences, Engineering, and Medicine

The U.S. medicolegal death investigation system is responsible for investigating and providing determinations of cause and manner of death, playing a vital role in the nation's public health and criminal justice systems. Recent, high-profile deaths in custody cases have drawn widespread attention to the determinations of cause and manner of death made by forensic pathologists, medical examiners, and coroners, and questions have been raised about the scientific validity of such determinations.

Strengthening the U.S. Medicolegal Death Investigation System: Lessons from Deaths in Custody evaluates the handling of deaths in police custody by the medicolegal death investigation system and recommends actions to strengthen the nation's medicolegal death investigation system.

By Laurie Caron, Frank Crispino and Cyril Muehlethaler

Tobacco smuggling remains a widespread illegal activity in Canada, associated with important social and economic impacts, and often linked to organized crime. This study explores the application of forensic profiling as an intelligence tool to support the analysis of contraband cigarette production and distribution. Physical and chemical manufacturing characteristics of seized contraband cigarette packs, provided by the Canada Border Services Agency (CBSA), were observed and coded using macroscopic, microscopic, and spectroscopic techniques. Multivariate statistical analyses were then conducted to compare manufacturing characteristics between packs and identify potential links. The analyses highlighted links between cigarette packs and seizures based on shared manufacturing characteristics. The results and the identified groups were also compared with seizure data provided by the CBSA. The results demonstrate the relevance of forensic profiling to formulate hypotheses regarding shared production processes or supply networks. These hypotheses provide information that contributes to understanding tobacco smuggling and aim to examine how forensic intelligence can support law enforcement and measures to prevent and disrupt this criminal activity. A preliminary optimal procedure for applying forensic profiling in operational contexts targeting contraband tobacco was finally proposed. Despite limitations in the dataset creation that were beyond our control, this study represents a starting point for applying this scientific approach to tobacco smuggling