Juror reactions to DNA evidence: Errors and expectancies

Jason Schklar*, Shari Seidman Diamond

*Corresponding author for this work

Research output: Contribution to journalReview article

77 Scopus citations


In this paper we examine evidence for two potential descriptions of juror reactions to probabilistic DNA evidence. The error-based description posits that jurors commit systematic logical or mathematical errors when they are called upon to evaluate quantitative evidence. The expectancy-based description posits that jurors use their background knowledge and beliefs in evaluating results from scientific tests. Consistent with the error-based description, participants in our study incorrectly aggregated separately presented probabilities and afforded probabilistic evidence less weight than would be expected by applying Bayesian norms. Consistent with the expectancy- based description, participants' background beliefs about the possibility of laboratory errors and intentional tampering affected the weight participants afforded a DNA match report. We discuss potential implications of these findings for the legal system and suggest directions for future research.

Original languageEnglish (US)
Pages (from-to)159-184
Number of pages26
JournalLaw and Human Behavior
Issue number2
StatePublished - May 18 1999

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Psychology(all)
  • Psychiatry and Mental health
  • Law

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