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2022 Fiscal Year Final Research Report

Theory and Practice on the Insanity Defense - Historical, Comparative Perspective

Research Project

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Project/Area Number 19K13534
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 05050:Criminal law-related
Research InstitutionHosei University (2020-2022)
The University of Tokyo (2019)

Principal Investigator

Sano Fumihiko  法政大学, 法学部, 准教授 (20779516)

Project Period (FY) 2019-04-01 – 2023-03-31
Keywords責任能力 / 刑事責任論
Outline of Final Research Achievements

This is the research on the insanity defense, which is gathering attention from academics and practitioners. Through comprehensive research on the history of theoretical framework and judicial practice in Japan, this research revealed that the original meaning of the defense's formula is fundamentally different from the current prevailing understanding and discovered how the theoretical framework diverged from the judicial practice. Furthermore, by analyzing the arguments and judicial cases in other countries, the research offered new insight into the current discussion in Japan.

Free Research Field

刑法

Academic Significance and Societal Importance of the Research Achievements

刑事責任能力判断は社会的耳目を集める分野だが、裁判員裁判導入以降、刑法学説・刑事実務で最も注目が集まる分野の一つでもある。近時の刑事実務の動向は、現在の有力説の論理的整合性等に疑問を投げかけるものであり、責任非難の原理に根差すと共にその適用範囲を明らかにする理論が求められている。本研究は、有力説の判例解釈に必然性がなく、また刑事実務の背景に一定の理論的立場があることを、判例学説史の網羅的検討により明らかにし、今後の議論の前提となる枠組み・情報を明らかにする点で、学術的意義を有する。さらに、裁判例分析を含む具体的議論を提起し、裁判実務に対する内在的・批判的検討を可能にする点で社会的意義を有する。

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Published: 2024-01-30  

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