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Fingerprint examiners set higher decision thresholds to avoid incorrect identifications, showing greater risk aversion than the general public. This study measured these thresholds to understand societal values in forensic decision-making.

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Area of Science:

  • Forensic Science
  • Cognitive Psychology
  • Decision Analysis

Background:

  • Fingerprint examiners utilize decision thresholds for identification and exclusion conclusions.
  • Existing error rate studies indicate a bias towards preventing erroneous identifications over exclusions.

Purpose of the Study:

  • To measure decision thresholds for fingerprint examiners and the general public.
  • To compare the risk aversion between examiners and potential jury members.

Main Methods:

  • Subjects manipulated decision criteria in a web-based visualization.
  • The visualization reflected trade-offs between erroneous identification and exclusion decisions.
  • Decision thresholds were externally measured and compared between groups.

Main Results:

  • Fingerprint examiners demonstrated greater risk aversion compared to the general public.
  • Examiner results aligned with established fingerprint error rate studies.
  • Demographic data identified factors influencing decision criterion placement.

Conclusions:

  • Fingerprint examiners are more risk averse than the general public.
  • The study provides a framework for assessing societal values in forensic decision-making.
  • Understanding these values is crucial for interpreting and responding to forensic evidence.