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The insanity defence: from wild beasts to M'Naghten
Stephen Allnutt1, Anthony Samuels, Colman O'driscoll
1Forensic Mental Health Service, Justice Health, University of New South Wales, Sydney, NSW, Australia. stephenallnutt@mac.com
Summary
The insanity defense, guided by the M'Naghten Rules, defines criminal responsibility. Psychiatrists play a key role in explaining mental illness to the court and jury.
Area of Science:
- Forensic Psychiatry
- Legal Psychology
Background:
- The insanity defense is a legal concept determining criminal responsibility.
- The M'Naghten Rules form the basis for assessing criminal responsibility due to mental illness.
- Jurisdictional variations exist in interpreting the elements of the insanity defense.
Purpose of the Study:
- To provide a comprehensive overview of the insanity defense.
- To explore the historical context and legal elements of the M'Naghten Rules.
- To examine the role of expert psychiatric evidence in insanity defense cases.
Main Methods:
- Historical analysis of the insanity defense.
- Review of M'Naghten Rules and their interpretations.
- Examination of relevant case law and expert evidence.
Main Results:
- The M'Naghten Rules are central to the insanity defense, with varied interpretations across jurisdictions.
- Expert evidence is crucial for addressing the 'ultimate issue' in insanity defense cases.
- Significant case law illustrates the application and challenges of the insanity defense.
Conclusions:
- Psychiatrists are vital in clarifying M'Naghten Rules for legal professionals and juries.
- The legal construct of insanity often conflicts with medical and public perceptions of mental illness.
- Guidelines are provided for psychiatrists offering expert testimony in insanity defense cases.
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