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Interpreting DNA under fingernails given activity level propositions.

John Buckleton1,2, Duncan Taylor3,4, James Curran1

  • 1Department of Statistics, University of Auckland, Auckland, New Zealand.

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|May 24, 2025
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Summary
This summary is machine-generated.

This study presents a DNA lookup table for fingernail evidence in assault cases. It quantizes likelihood ratios (LRs) based on social interaction, POI DNA presence, and complainant statements, aiding forensic analysis.

Keywords:
Bayesian networkLR look‐up tableevaluation of DNA given activity level propositionsexpert testimonyfingernailsforensic DNA analysis

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Area of Science:

  • Forensic Science
  • Genetics
  • Criminalistics

Background:

  • Fingernail DNA analysis is crucial in assault investigations.
  • Interpreting DNA evidence requires considering various contextual factors.
  • Likelihood ratios (LRs) are used to quantify the strength of evidence.

Purpose of the Study:

  • To develop a general lookup table for LRs in cases involving fingernail DNA evidence.
  • To assess the impact of social interaction and complainant statements on DNA evidence interpretation.
  • To provide a framework for evaluating DNA evidence in criminal investigations.

Main Methods:

  • Generation of a lookup table for LRs.
  • Consideration of social interaction between complainant and person of interest (POI).
  • Inclusion of complainant's statements about scratching and visible scratches on the POI.

Main Results:

  • LRs range from thousands to less than one, depending on factors like POI DNA, unknown DNA, and social interaction.
  • Socialization between complainant and POI generally lowers LRs, supporting the alternative hypothesis (Ha) if unknown DNA is present.
  • The presence of POI DNA without unknown DNA and no social contact yields LRs in the thousands, supporting the prosecution hypothesis (Hp).

Conclusions:

  • The developed lookup table provides quantitative LRs for fingernail DNA evidence.
  • Factors such as social contact and complainant statements significantly influence the interpretation of DNA evidence.
  • This framework enhances the discriminatory power of DNA analysis in forensic investigations.