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Insanity defenses: contested or conceded?

J L Rogers, J D Bloom, S M Manson

The American Journal of Psychiatry

|July 1, 1984

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In Oregon, prosecutors accepted insanity defense verdicts in over 80% of criminal cases. Disagreements arose when defendants were diagnosed with personality disorders rather than psychosis, suggesting a need to re-evaluate the insanity defense debate.

Area of Science:

Forensic Psychology
Criminal Law
Psychiatry

Background:

The insanity defense is a complex legal and psychological construct.
Understanding the application and outcomes of the insanity defense is crucial for legal and mental health professionals.

Purpose of the Study:

To analyze the outcomes of insanity defense pleas in Oregon criminal cases.
To identify factors contributing to contested insanity trials.

Main Methods:

Retrospective analysis of 316 Oregon criminal cases involving successful insanity pleas.
Review of expert diagnoses (psychotic disorders vs. personality disorders) and trial outcomes.

Main Results:

Prosecutors agreed to insanity verdicts in over 80% of cases.

Related Experiment Videos

The majority of defendants were diagnosed with psychosis by examining experts.

Cases involving personality disorder diagnoses were disproportionately contested.

Conclusions:

Oregon's insanity defense system largely operates on prosecutorial consensus.
Disagreements and contested trials are more common when defendants are diagnosed with personality disorders.
A reorientation of the insanity defense debate is suggested, focusing on diagnostic criteria and contested cases.