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Legal Systems Lab
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The lab studies, from the perspectives of law and psychiatry, the treatment of mentally disordered offenders and support for preventing reoffending.
AboutAbout the lab
Studying where law and psychiatry meet
The lab examines systems for the treatment of mentally disordered offenders in Japan and abroad, and makes recommendations on how those systems should work and how they can be improved.
It regularly holds study meetings that bring together people from the many institutions involved in treatment, including courts, correctional facilities, and psychiatric medical institutions.
In recent years, the lab has focused on joint research with correctional facilities, studying offending behavior and mental health, and offering new treatment and education programs and new perspectives for assessment.
From an international perspective, it also studies involuntary admission in psychiatry, the protection of the human rights of people with mental disorders, and the assessment of decision-making capacity under the adult guardianship system.
Key terms
- Mentally Disordered Offenders
- People with mental disorders who have committed acts that violate criminal law. Questions arise about their criminal responsibility and about how they should be treated and managed.
- Risk Assessment
- A method of estimating, through a set procedure, the degree of danger that violence, reoffending, or similar behavior will occur.
- Offender Rehabilitation
- A system that supports people who have committed crimes and juveniles with delinquent behavior in getting back on their feet within the community, through measures such as probation.
NewsLab news
View More ↗ResearchResearch themes
The lab carries out practical research on supporting the prevention of reoffending in cases of sexual offending and violent behavior, support for transition to the community, and early intervention in adolescence. Working with correctional facilities, offender rehabilitation services, and educational institutions, it develops risk assessment and community-based support models.
*Illustrative imageSupport and Relapse Prevention for Problematic Sexual Behavior
The lab studies support and prevention of reoffending for people with problematic sexual behavior or a history of sexual offending, and ways to build community systems that support them.
*Illustrative imageSupporting the Social Reintegration of Long-Term Prisoners
The lab studies ways to support the social reintegration of long-term prisoners through education and group work in prison and through connections with the community after release.
*Illustrative imageRisk Assessment and Protective Factors
The lab studies not only how to assess the risk of violence and sexual offending, but also a protective-factors approach that looks to a person's strengths and potential for recovery.
*Illustrative imageJuvenile Justice and Offender Rehabilitation
The lab studies support practices in juvenile training schools and probation, the prevention of reoffending, and support for social participation.
MembersFaculty
The lab's members consist of faculty, visiting faculty, and visiting researchers.As of 2026
- ProfessorYoshito Igarashi
- Project LecturerAika Tomoto
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Exterior of Allen County Courthouse (Indiana)” kristinafh / CC BY 2.0 (cropped)
- Support and Relapse Prevention for Problematic Sexual Behavior: “Therapy Room at Resilient Mind Therapies, Leicester” RMtherapies / CC BY-SA 4.0 (cropped)
- Supporting the Social Reintegration of Long-Term Prisoners: “Chiayi old prison-prison cell (Taiwan)” Mark1698 / CC BY-SA 4.0 (cropped)
- Risk Assessment and Protective Factors: “Questionnaire-checklist-completed” https://pixabay.com/users/ / / CC0 (cropped)
- Juvenile Justice and Offender Rehabilitation: “Wooden gavel 20170417” Santeri Viinamäki / CC BY-SA 4.0 (cropped)
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