FBI OIG Report (2006)
Definition
The FBI Office of Inspector General's report published November 2006 reconstructing the Mayfield misidentification. Found that confirmation bias, non-independent verification, and contextual contamination were the primary causes, and made 18 recommendations for FBI fingerprint examination reform.
- Published
- November 2006
- Author
- FBI Office of Inspector General
- Subject
- Brandon Mayfield misidentification
- Recommendations
- 18 for fingerprint examination reform
Common questions
What did the report identify as the primary cause of the Mayfield misidentification, rather than just poor print quality?+
It found confirmation bias and non-independent verification as the core drivers: once the first examiner declared a match, subsequent verifying examiners were aware of that conclusion and of Mayfield's background, which contaminated their supposedly independent reviews rather than the latent print itself being unusually poor.
How did the 18 recommendations change fingerprint examination practice afterward?+
They pushed the field toward blind verification, where confirming examiners are not told the original examiner's conclusion or case context, along with documentation requirements for how a match decision was reached, aimed directly at removing the contextual bias the report identified.
Related terms
- ACE-V
- Analysis, Comparison, Evaluation, Verification: the four-stage method for latent print examination used by accredited forensic fingerprint laboratories. Analysis examines the latent in...
- 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...
- 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...
- OSAC Friction Ridge Subcommittee
- The NIST-housed committee that produces formal consensus standards for friction ridge examination in the United States, operating within the Biology Scientific Area...
- 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...