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Using a tree diagram to interpret a mixed DNA profile

I W Evett1, L A Foreman, J A Lambert

  • 1Forensic Science Service, Metropolitan Laboratory, London, UK.

Journal of Forensic Sciences
|June 3, 1998
PubMed
Summary

Forensic analysis of bloodstains on a knife revealed a mixture from two victims. A tree diagram approach simplified complex hypotheses, confirming robust results regardless of expert judgment on mixture presence.

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Area of Science:

  • Forensic Science
  • Biochemistry
  • Probabilistic Analysis

Background:

  • Bloodstain pattern analysis is crucial in forensic investigations.
  • Complex cases may involve mixtures of biological fluids from multiple individuals.
  • Interpreting mixed stains requires robust analytical methods.

Observation:

  • A case involving bloodstaining on a knife suggested a mixture from two victims.
  • The presence of mixed blood on the knife was a key piece of evidence.
  • Expert judgment on the likelihood of a mixture varied.

Findings:

  • Multiple hypotheses were formulated to interpret the bloodstain evidence.
  • A tree diagram approach was employed to analyze these hypotheses.
  • The analysis simplified to comparing two primary alternative hypotheses.

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  • The findings remained consistent despite variations in expert opinion on mixture presence.

    • Implications:

    • This methodology provides a structured way to analyze complex forensic evidence.
    • The robustness of the results suggests reliability in probabilistic interpretation of mixed bloodstains.
    • This approach can aid in forensic casework involving biological mixtures.