Within-Expert Contradiction
Definition
The finding, documented by Dror and Charlton (2006), that the same examiner can reach contradictory conclusions about the same mark-exemplar pair across two examination sessions when the contextual framing differs, demonstrating that conclusions are not purely determined by the friction-ridge evidence.
- Documented by
- Dror and Charlton, 2006
- Finding
- Same examiner, same mark-exemplar pair, contradictory conclusions
- Cause
- Different contextual framing across sessions
- Field
- Friction-ridge (fingerprint) examination
Common questions
What does the within-expert contradiction finding imply for fingerprint evidence reliability?+
It shows that conclusions are not driven purely by the objective features of the print itself, since irrelevant contextual information supplied to the examiner can shift the outcome, which is why the finding is cited in arguments for context management and blind verification procedures.
How is within-expert contradiction different from disagreement between two different examiners?+
Inter-examiner disagreement compares different people's judgments on the same evidence, while within-expert contradiction isolates the same single examiner reaching opposite conclusions on the identical mark-exemplar pair, which more directly implicates contextual bias rather than differences in skill or training.
Related terms
- Blind Verification
- The procedure in which a second fingerprint examiner independently performs the Analysis and Comparison stages without knowledge of the first examiner's conclusion....
- Confirmation Bias
- The cognitive tendency to search for, interpret, favour, and recall information in a way that confirms or supports one's prior beliefs or...
- Contextual Bias
- The influence of case-relevant background information (suspect financial difficulties, police intelligence) on the direction of an examiner's technical analysis. Demonstrated experimentally for...
- Evaluative Reporting
- A framework for expressing forensic conclusions in terms of the probability of the evidence given the prosecution hypothesis versus the defence hypothesis...
- LIMS Stage Gating
- A laboratory information management system function that prevents an examiner from advancing to the next examination stage until the current stage is...
- Linear ACE-V
- An implementation of ACE-V methodology that enforces strict sequential documentation: analysis of the latent mark must be completed and recorded before the...
- Mayfield Error
- The 2004 FBI misidentification of Brandon Mayfield as a contributor to a latent print from the Madrid train bombing, attributed by the...
- Sequential Unmasking
- An information-sequencing protocol in which the examiner receives the questioned material first, completes and documents the analysis before receiving the known standards,...
- SWGFAST
- Scientific Working Group for Friction Ridge Analysis, Study and Technology; the predecessor body to the OSAC Friction Ridge Subcommittee; produced documentation standards...