Skip to content

Certainty and Uncertainty in Reporting Fingerprint Evidence

Journal: Daedalus
Published: 2018
Primary Author: Joseph Kadane
Secondary Authors: Jonathan J. Koehler
Research Area: Latent Print

Everyone knows that fingerprint evidence can be extremely incriminating. What is less clear is whether the way that a fingerprint examiner describes that evidence influences the weight lay jurors assign to it. This essay describes an experiment testing how lay people respond to different presentations of fingerprint evidence in a hypothetical criminal case. We find that people attach more weight to the evidence when the fingerprint examiner indicates that he believes or knows that the defendant is the source of the print. When the examiner offers a weaker, but more scientifically justifiable, conclusion, the evidence is given less weight. However, people do not value the evidence any more or less when the examiner uses very strong language to indicate that the defendant is the source of the print versus weaker source identification language. We also find that cross-examination designed to highlight weaknesses in the fingerprint evidence has no impact regardless of which type of conclusion the examiner offers. We conclude by considering implications for ongoing reform efforts.

Related Resources

Latent print comparison and examiner conclusions: A field analysis of case processing in one crime laboratory

Latent print comparison and examiner conclusions: A field analysis of case processing in one crime laboratory

Scholarship on the latent print comparison process has expanded in recent years, responsive to the call for rigorous research by scholarly groups (e.g., National Academy of Sciences, 2009; President’s Council…
Psychometric analysis of forensic examiner behavior

Psychometric analysis of forensic examiner behavior

Forensic science often involves the comparison of crime-scene evidence to a known-source sample to determine if the evidence and the reference sample came from the same source. Even as forensic…
Implementing blind proficiency testing in forensic laboratories: Motivation, obstacles, and recommendations

Implementing blind proficiency testing in forensic laboratories: Motivation, obstacles, and recommendations

Regular proficiency testing of forensic examiners is required at accredited laboratories and widely accepted as an important component of a functioning quality assurance program. Yet, unlike in other testing industries,…
Implementation of a Blind Quality Control Program in a Forensic Laboratory

Implementation of a Blind Quality Control Program in a Forensic Laboratory

A blind quality control (QC) program was successfully developed and implemented in the Toxicology, Seized Drugs, Firearms, Latent Prints (Processing and Comparison), Forensic Biology, and Multimedia (Digital and Audio/Video) sections…