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Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm
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Forensic experts' perceptions of expert bias.

Michael Lamport Commons1, Patrice Marie Miller, Eva Yujia Li

  • 1Department of Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. commons@tiac.net

International Journal of Law and Psychiatry
|October 11, 2012
PubMed
Summary

Expert witnesses perceive situations differently regarding bias. Working for one side is highly biasing, while being a treater or "hired gun" is seen as less biasing, suggesting complexity in understanding expert witness bias.

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Area of Science:

  • Forensic Psychiatry
  • Legal Psychology
  • Expert Witness Testimony

Background:

  • Understanding perceptions of bias among expert witnesses is crucial for maintaining the integrity of legal proceedings.
  • Previous research has not fully explored how expert witnesses themselves evaluate potential biases in their peers.

Purpose of the Study:

  • To investigate how expert witnesses perceive the biasing potential of various situations involving opposing expert witnesses.
  • To establish a ranked scale of perceived bias based on expert witness evaluations.

Main Methods:

  • Participants, attendees of an American Academy of Psychiatry and Law workshop, rated the biasing potential of different scenarios.
  • Rasch analysis was employed to create a linear scale of perceived bias.
  • The study explored the relationship between the conceptual complexity of bias and its perceived biasing potential.

Main Results:

  • Working exclusively for one party in civil and criminal cases was perceived as highly biasing.
  • Situations such as an opposing expert also being the litigant's treater or being labeled a "hired gun" were perceived as less biasing.
  • The perceived bias was inversely related to the conceptual complexity of the situation; more complex items were seen as less biasing.

Conclusions:

  • The perception of bias among expert witnesses is influenced by the understandability of the situation.
  • Greater conceptual difficulty in understanding a potential bias leads to a lower perception of its biasing effect.
  • This highlights a potential disconnect in how bias is understood and evaluated within the expert witness community.