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Updated: Jan 26, 2026

A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
Published on: March 1, 2022
How does India Decide Insanity Pleas? A Review of High Court Judgments in the Past Decade
Parthasarathy Ramamurthy1, Vijay Chathoth1, Pradeep Thilakan1
1Department of Psychiatry, Pondicherry Institute of Medical Sciences, Puducherry, India.
Insanity pleas were successful in 17.65% of Indian High Court cases between 2007-2017. Factors like prior mental illness evidence and expert psychiatric opinions influenced outcomes for mentally ill offenders.
Area of Science:
- Forensic Psychiatry
- Indian Criminal Law
- Legal Psychology
Background:
- Section 84 of the Indian Penal Code addresses acts by individuals with unsound minds.
- This study examines the application of the insanity defense in Indian High Courts.
Purpose of the Study:
- To estimate the success rate of insanity pleas in Indian High Courts.
- To identify factors influencing the outcome of insanity pleas for mentally ill offenders.
Main Methods:
- Data was collected from 23 Indian High Courts (2007-2017).
- Keywords 'insanity' and 'mental illness' were used to retrieve judgments.
- Information on crime, psychiatric diagnosis, evidence, and court verdict was analyzed.
Main Results:
- 102 cases were analyzed from 13 High Courts.
- Insanity pleas were successful in 18 cases (17.65%).
- Lower court verdicts, pre-crime mental illness documentation, and psychiatric opinions were associated with successful pleas.
Conclusions:
- Insanity pleas had an approximate 17% success rate in Indian High Courts over a decade.
- Key factors influencing plea success offer guidance for stakeholders managing mentally ill offenders.
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