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Psychiatric evidence on the ultimate issue.

Alec Buchanan1

  • 1Department of Psychiatry, Yale University, 34 Park Street, New Haven, CT 06519, USA. alec.buchanan@yale.edu

The Journal of the American Academy of Psychiatry and the Law
|April 6, 2006
PubMed
Summary

Federal Rule of Evidence 704(b) restricts expert testimony on a defendant's mental state in federal criminal trials. Its inconsistent application and criticism highlight challenges in its judicial development and interpretation.

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Area of Science:

  • Forensic Psychiatry
  • Legal Medicine
  • Evidence Law

Background:

  • Federal Rule of Evidence 704(b) prohibits expert witnesses from testifying on a defendant's mental state regarding criminal elements.
  • This rule represents a departure from the 20th-century trend allowing expert testimony on ultimate issues.
  • The rule's application has faced inconsistencies and judicial criticism.

Purpose of the Study:

  • To trace the origins and judicial evolution of Federal Rule of Evidence 704(b).
  • To analyze the challenges and inconsistencies in the application of the rule.
  • To examine attempts to circumvent the rule and judicial responses.

Main Methods:

  • Historical analysis of legal precedents and judicial decisions.
  • Review of appellate court critiques and interpretations of the rule.
  • Examination of strategies used to bypass the rule's restrictions.

Main Results:

  • The rule's development reveals a complex judicial history.
  • Inconsistent application has led to criticism and varied interpretations.
  • Circumvention attempts include inferential testimony, hypothetical cases, and probability assessments.

Conclusions:

  • Judicial application of Federal Rule of Evidence 704(b) has been inconsistent.
  • Criticism of the rule has led to varied legal interpretations and circumvention strategies.
  • Transparency in expert reasoning may mitigate issues arising from ultimate issue testimony.

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