Leeds Beckett University - City Campus,
Woodhouse Lane,
LS1 3HE
Dr Leona Mydlowski
Reader
Leona completed her PhD at Leeds Beckett Law School between 2014 and 2018. Leona's doctoral thesis, An Explorative Study of Police Sex Offender Management: The Home Visit Process, examined police approaches to managing registered sexual offenders through home visits.
Following the completion of her PhD, Leona held academic positions at the University of Bradford and the University of Central Lancashire, where she worked as a Lecturer and Senior Lecturer. In June 2026, Leona returned to Leeds Beckett University as Reader in Law. For the past decade, Leona's research has focused on sexual violence and sexual offender management, with particular expertise in police management of registered sexual offenders, the home visit process, and offender desistance. Leona has published extensively in these areas and has secured research funding to investigate the management of both adult and juvenile sexual offenders. Leona's work has been presented at numerous national and international conferences. Leona is currently the Principal Investigator for a Home Office-funded project evaluating the effectiveness of the Active Risk Management System (ARMS), the risk assessment tool used to assess registered sexual offenders in England and Wales. Leona leads a team of researchers undertaking a nationwide review of ARMS to determine its effectiveness in predicting the risk posed by registered sexual offenders and to inform future evidence-based practice. Leona is a member of the British Society of Criminology, the American Society of Criminology, the Evidence Based Policing Society, the American Society of Evidence-Based Policing, and the National Organisation for the Treatment of Abuse. Leona contributes to teaching across the Law School on both Law and Law with Criminology programmes, drawing on her extensive research expertise to inform her teaching.
About
Leona completed her PhD at Leeds Beckett Law School between 2014 and 2018. Leona's doctoral thesis, An Explorative Study of Police Sex Offender Management: The Home Visit Process, examined police approaches to managing registered sexual offenders through home visits.
Following the completion of her PhD, Leona held academic positions at the University of Bradford and the University of Central Lancashire, where she worked as a Lecturer and Senior Lecturer. In June 2026, Leona returned to Leeds Beckett University as Reader in Law. For the past decade, Leona's research has focused on sexual violence and sexual offender management, with particular expertise in police management of registered sexual offenders, the home visit process, and offender desistance. Leona has published extensively in these areas and has secured research funding to investigate the management of both adult and juvenile sexual offenders. Leona's work has been presented at numerous national and international conferences. Leona is currently the Principal Investigator for a Home Office-funded project evaluating the effectiveness of the Active Risk Management System (ARMS), the risk assessment tool used to assess registered sexual offenders in England and Wales. Leona leads a team of researchers undertaking a nationwide review of ARMS to determine its effectiveness in predicting the risk posed by registered sexual offenders and to inform future evidence-based practice. Leona is a member of the British Society of Criminology, the American Society of Criminology, the Evidence Based Policing Society, the American Society of Evidence-Based Policing, and the National Organisation for the Treatment of Abuse. Leona contributes to teaching across the Law School on both Law and Law with Criminology programmes, drawing on her extensive research expertise to inform her teaching.
Leona completed her PhD at Leeds Beckett Law School between 2014 and 2018. Her doctoral thesis, An Explorative Study of Police Sex Offender Management: The Home Visit Process, examined police approaches to managing registered sexual offenders through home visits.
Following the completion of her PhD, Leona held academic positions at the University of Bradford and the University of Central Lancashire, where she worked as a Lecturer and Senior Lecturer. In June 2026, she returned to Leeds Beckett University as Reader in Law. For the past decade, Leona's research has focused on sexual violence and sexual offender management, with particular expertise in police management of registered sexual offenders, the home visit process, and offender desistance. She has published extensively in these areas and has secured research funding to investigate the management of both adult and juvenile sexual offenders. Her work has been presented at numerous national and international conferences. Leona is currently the Principal Investigator for a Home Office-funded project evaluating the effectiveness of the Active Risk Management System (ARMS), the risk assessment tool used to assess registered sexual offenders in England and Wales. Leona leads a team of researchers undertaking a nationwide review of ARMS to determine its effectiveness in predicting the risk posed by registered sexual offenders and to inform future evidence-based practice. Leona is a member of the British Society of Criminology, the American Society of Criminology, the Evidence Based Policing Society, the American Society of Evidence-Based Policing, and the National Organisation for the Treatment of Abuse.
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Research interests
Leona's research focuses on police sex offender management, with particular expertise in the assessment and management of registered sexual offenders. Leona's work has centred on the Active Risk Management System (ARMS), the risk assessment tool used by police to assess the risk posed by registered sexual offenders in England and Wales. Leona's research has examined a range of issues relating to ARMS, including police perceptions of the tool, the training provided to officers, the conduct of home visits during the risk assessment process, police interviewing practices, and offender desistance. Through this programme of research, Leona has contributed to improving the evidence base underpinning police management of registered sexual offenders. Leona has secured funding from a range of organisations to support research in this field and is currently the Principal Investigator on a Home Office-funded project evaluating the effectiveness of the Active Risk Management System (ARMS). This national study is assessing the extent to which ARMS accurately predicts risk among registered sexual offenders and aims to inform future policy and practice in offender management. In addition to police sex offender management, Leona's research interests include sexual violence, sexual violence typologies, and the prevention of sexual violence.
Publications (20)
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A failure of distributive & procedural justice? An analysis of the violent and sex offender register (VISOR) to compare the demographic characteristics of 'actively' and 'reactively' managed offenders
This paper analyses data from the violent and sex offenders register to compare those offenders that are currently managed under 'active' and 'reactive' management. This paper makes suggestions as to the 'typology' of offender that should be placed on reactive management.
The future of Active Risk Management System following the recommendations in the Creedon Review
This presentation outlines the findings from the Creedon Review and discusses the future of Active Risk Management System (ARMS) as a desistance tool
Examining the tensions between policing people convicted of sexual offending and promoting the desistance process
This presentation explores the concept of incorporating desistance into sex offender management by police and whether desistance is an achievable concept for police management
Serious Violence Toolkit - Online resources
This toolkit provides online resources for practitioners to use when engaging with young persons who engage in serious violence
Sex Offender Management
This chapter outlines the current UK approach to sex offender management and how desistance can be incorporated into police management of registered sex offenders
A desistance practice framework for police led management of people with sexual convictions
This is a briefing paper for the police forces who manage sexual offenders. This provides a framework for police professionals to incorporate desistance into their practices of risk assessing sexual offenders
Police Officers perceptions of Active Risk Management System (ARMS) and whether this is an effective tool to risk assess Registered Sex Offenders
Police Officers Perceptions of the Risk Assessment of ARMS following the Home Visit Process
Risk Assessment of registered sex offenders in the community: A new style of policing?
This presentation discussed the United Kingdom's approach to sex offender management and provides recommendations for adopting an international approach of management of sex offenders
Interim findings from the National ARMS Review
This presentation presents work to date on the national ARMS review and presents next stages in the research
Interim findings from the national ARMS Review: Qualitative findings
This presentation outlines findings from the first stage of the ARMS review, namely, interview and survey findings. This presentation provides recommendations for future versions of adult male risk assessments
'The Home Visit' process and its relationship with desistance in adult males with sexual offence convictions
This presentations discusses the current approach adopted in the united kingdom for police management of registered sex offenders. This paper particularly focuses on the home visit process, risk assessment and desistance
Current trends and challenges in the role of 'offender management' and the 'home visit' process
This presentation discusses the current approach to UK sex offender management (ARMS) and how a specialist group of police offender managers known as management of sexual and violent offenders (MOSOVO) utilise this risk assessment during the home visit
Briefing paper on police management of registered sexual offenders
This paper is a briefing for police forces on the current management processes for managing registered sex offenders, risk assessment and home visit practice. This paper provides recommendations for future practice.
The police as formal agents of change: Assisting desistance in individuals convicted of sexual offences
Comprehensive and multi-disciplinary public health approaches are necessary to prevent sexual re-offending. However, criminal justice solutions continue to dominate and the arrangement in England and Wales is no exception. The introduction of the Multi-Agency Public Protection Arrangements (MAPPA) in 2003 brought together the work of the police, prison and probation services in order to manage violent and sexual offenders. This paper focuses specifically on the work of the specialist police officers who are tasked under MAPPA with the Management of Sexual or Violent Offenders (MOSOVO) and whether or not they can assist desistance in those who have been convicted of a sexual offence. We argue that the risk-based, highly politicized model of public protection that MOSOVO staff operate within creates tensions more likely to hinder than facilitate desistance. As indicated by findings in an independent review of the police’s management of registered sex offenders (2023), successful desistance journeys are found in people who are supported by formal agents who actively promote hope and optimism and convey a belief that the person attempting desistance can change. In conclusion, we recommend that MOSOVO staff be willing and resourced to help individuals with sexual convictions develop a non-offending lifestyle and identity and support them in achieving this goal, which requires the provision ofcomprehensive support beyond risk management.
A desistance practice framework to support police professionals working with people with sexual convictions
Under Multi-Agency Public Protection Arrangements (MAPPA) in England and Wales, statutory agencies (police, probation, and prison services) are responsible for assessing and managing the risk of over 70,000 people subject to sexual notification requirements. With the majority (approximately three-quarters) of this population being managed in the community by specialist police professionals, control and containment approaches dominate policy and practice. This is of concern because risk management tactics that adopt restrictive measures in isolation can only achieve short-term goals. However, when combined with desistance-focused strategies, longer-term change is facilitated. Desistance refers to the cessation of criminal behaviour, requiring both cognitive and behavioural change, alongside pro-social and structural support. Positive informal (e.g. family and friends) and formal (e.g. police) relationships are crucial in fostering successful desistance outcomes. But, because desistance is a meta-theory, integrating various psychological, social, and situational theories, its operationalisation is complex. To effectively address sexual reoffending, police professionals must maximise every opportunity to support the desistance process among people with sexual convictions. To this end, we introduce our Desistance Practice Framework, co-developed with police stakeholders and people with sexual convictions. We outline here our consultation process and present the theoretical foundations underpinning our model.
Outlining the Co-Development of Twelve Desistance Principles to Reduce Sexual Reoffending
The number of people managed under MAPPA in England and Wales has risen significantly, creating new challenges for police supervising individuals with sexual convictions. Responding to calls for desistance-focused practices, this case study explores a co-produced project designed to support MOSOVO officers in adopting desistance-oriented approaches. Through participatory action research, police officers, people with lived experience, and academics collaborated to create three practical tools: a Desistance Practice Framework, a Desistance Management Plan, and Twelve Principles for Assisting Desistance. These were refined through stakeholder input and aim to help police support individual change, reduce reoffending, and manage growing caseloads more effectively. The principles provide a foundation for embedding desistance into policing, aligning risk management with rehabilitation and human rights.
Purpose In England and Wales, adult male registered sex offenders (RSOs) are risk assessed and managed using a tool known as the Active Risk Management System (ARMS); a risk assessment designed specifically for police management of RSOs and carried out by a specialist group of police officers known as Management of Violent or Sexual Offenders (MOSOVO) at the RSO’s home, known as ‘the home visit’. The purpose of this paper is to explore RSOs views of the home visit and risk assessment and to make recommendations to MOSOVO as to improve future home visit and risk assessment practice. Methodology This study aimed to examine a sample of adult male RSOs’ views of the risk assessment and home visit process. Three police forces in England and Wales agreed to facilitate sampling of 10 RSOs who varied in their level of risk - namely, low, medium, high and very high. Findings Three themes were developed from the analysis: Anxiety and shame; Perceptions of the first home visit; and The property search and observations. We discuss these experiences in light of the growing call for MOSOVOs to both manage risk and assist desistance and present recommendations for improving both the home visit and risk assessment practice. Originality To the authors knowledge, this is the first study to understand and explore RSOs views of the home visit and risk assessment process.
In UK, police officers are specially trained to become Management of Sexual or Violent Offenders (MOSOVO) officers. MOSOVO officers risk assess Registered Sex Offenders during home visits. We aimed to examine the MOSOVO training and home visits, and determine whether there is an alignment between training and practice. Three police forces in UK participated. Firstly, the MOSOVO training course was observed at each force. Secondly, MOSOVO officers in each force recorded home visits over a two-week period; the authors randomly selected 12 recordings for analysis. Field notes and transcripts were analysed using thematic analysis. Four themes were developed: unspecialised trainers lead to distrust and disengagement; the training does not prepare officers for all types of home visit; tensions between standard police policies and MOSOVO role; police suspicion of RSOs influences home visit implementation. We provide recommendations to improve MOSOVO training and the home visit process.
Serious Youth Violence Toolkit
This report was a commissioned piece of work by Lancashire Youth Justice Board to develop a serious violence toolkit for young persons who engage in violent crime.
Professional activities
Dr Mydlowski has held numerous national advisory and expert appointments relating to the management and prevention of sexual offending, policing, and safeguarding. Leona currently serves as Principal Investigator and Expert Advisor to the Home Office National Review into Police Management of Sexual Offenders and is an Advisor to the Home Office Prevention of Sexual Offenders Panel. Leona is also an Expert Advisor to the Home Office Management of Sexual Offenders Working Group, the Home Office Violence Against Women and Girls Sexual Offenders Panel and the Home Office Prevention of Sexual Offending Group. In addition, Dr Mydlowski advises the Angiolini Inquiry on behalf of the National Police Chiefs' Council. Previous appointments include serving on the Home Office Panel for the Independent Review into the Police-Led Management of Registered Sex Offenders in the Community (the Creedon Review). Leona has also served as an Advisor to the Lancashire Constabulary Safeguarding Board and the Lancashire Violence Reduction Network Group, contributing specialist expertise to the development of policy, practice, and safeguarding strategies at both national and regional levels.
Activities (19)
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American Evidence Based Policing Society
Society of Evidence Base Policing
National Organisation for Treatment of Abusers
Association of Treatment of Sexual Abuser
Journal of Criminal Psychology
Policing
Policing & Society
Journal of Sexual Aggression, The
Sex Offender Policy Unit
British Society of Criminology
American Society of Criminology
Most downloaded article
Journal of Child Sexual Abuse
International Journal of Law and Society
Visiting Research Fellowship
Sex Offender Policy
Management of Sexual and Violent Offenders
Current teaching
Leona has extensive teaching experience across both further and higher education. Leona has delivered teaching at undergraduate and postgraduate levels across the disciplines of Law, Criminology, and Criminal Justice. Throughout her academic career, Leona has taught and led modules in Criminal Law, International Criminal Law, Research Methods, Sexual Offending, Youth Justice Decision-Making, and Policing. Leona has substantial experience in module leadership and curriculum development, supporting students across a range of programmes. In addition to her teaching responsibilities, Leona has held course leadership roles, including serving as Course Leader for the MSc Criminal Investigation, where she oversaw programme delivery, curriculum enhancement, and student experience. Leona also contributes to the wider higher education community through external examining. She currently holds External Examiner appointments at the University of Surrey and Teesside University.
Teaching Activities (4)
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Bsc Policing Law Enforcement and Investigation
01 September 2020 - 16 July 2024
BA (HONS) Criminology and Criminal Justice
18 September 2023 - 22 June 2026
Grants (9)
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Prevention of Sexual Offending feasability study
National Evaluation of Active Risk Management System (ARMS)
Management of Sexual Offenders Knowledge Exchange Conference
Management of Sexual Offenders Knowledge Exchange Conference
Visiting Research Fellow Grant
Review of Police Practices for Management of registered sex offenders
The development of a desistance practice framework for police professionals
Secondment to VKPP
Development of Serious Violence Toolkit
Impact
Dr Leona Mydlowski has developed a strong impact and engagement profile characterised by sustained influence on UK national policing policy, Home Office strategy, police practice, and safeguarding, particularly in the management and prevention of sexual offending. Leona's work extends well beyond academic publication to shape national policy, professional practice, and operational policing. Leona's impact is demonstrated through her appointment to multiple Home Office advisory groups, including the National Review into Police Management of Sexual Offenders, the Prevention of Sexual Offenders Panel, the Management of Sexual Offenders Working Group, the Violence Against Women and Girls Sexual Offenders Panel, and the Prevention of Sexual Offending Group. Leona has also advised the Angiolini Inquiry on behalf of the National Police Chiefs' Council and previously served on the Home Office Panel supporting the Creedon Review, the independent review of police-led management of registered sex offenders in the community. These appointments place her research at the centre of national policy development and operational reform.
Leona's research has had direct operational impact on policing. As Principal Researcher on the national review of the Active Risk Management System (ARMS), undertaken in collaboration with police forces, the Home Office and the College of Policing, Leona's work has examined how specialist Management of Sexual and Violent Offenders (MOSOVO) officers assess and manage registered sex offenders. The research has generated evidence-based recommendations for improving officer training, risk assessment, offender engagement, and desistance-focused practice, with findings informing national discussions on future policing guidance. Leona has also demonstrated significant engagement through long-standing partnerships with police forces, safeguarding organisations, and violence reduction partnerships. Leona's advisory roles with Lancashire Constabulary Safeguarding Board and the Lancashire Violence Reduction Network illustrate sustained regional knowledge exchange, while collaborative research with police practitioners has ensured that operational staff have been actively involved in the co-production of new practice frameworks.