Multiple personality: an issue for forensic psychiatry

Area of Science:

• Psychiatry and Law
• Forensic Psychology
• Dissociative Disorders

Background:

• The Diagnostic and Statistical Manual of Mental Disorders, Third Edition (DSM-III) defined Multiple Personality (MP) as a distinct clinical entity.
• Clinical diagnosis of MP disorder often relies on specific criteria, but legal application demands rigorous independent verification.

Observation:

• A patient diagnosed with MP disorder under hypnosis later denied the condition, leading to a malpractice lawsuit.
• Expert opinions differed significantly regarding the patient's diagnosis during legal proceedings, with some supporting MP and others suggesting a mixed personality disorder with dissociation.

Findings:

• The case underscores the challenges in legally validating MP diagnoses, particularly when relying on subjective clinical findings.
• Auto-suggestion emerged as a potential factor mimicking MP symptoms, questioning the reliability of hypnosis-induced diagnoses in legal contexts.
• Discrepancies between clinical assessment and forensic evaluation highlight the need for objective, independent data in legal cases involving MP disorder.

Implications:

• Legal standards for diagnosing MP disorder require robust, verifiable evidence of incongruent behavioral patterns indicative of alternate personalities.
• The validity of MP diagnoses in court is questioned, emphasizing the need for caution and stringent evaluation methods.
• This case prompts a re-evaluation of diagnostic criteria and assessment methods for dissociative disorders in forensic settings.