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Using the likelihood ratio in bloodstain pattern analysis.

Daniel Attinger1, Kris De Brabanter2,3, Christophe Champod4

  • 1Struo LLC, Ames, Iowa, USA.

Journal of Forensic Sciences
|October 29, 2021
PubMed
Summary
This summary is machine-generated.

The likelihood ratio (LR) framework is applicable to bloodstain pattern analysis (BPA), but its use is complex. Research in physics, data sharing, and statistical training are needed to facilitate LR application in BPA.

Keywords:
bloodbloodstain pattern analysiscourtroom testimonylikelihood ratiostatistics

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Area of Science:

  • Forensic Science
  • Fluid Dynamics

Background:

  • Likelihood ratio (LR) is standard for evaluating forensic evidence weight in court.
  • Bloodstain Pattern Analysis (BPA) experts rarely use LR despite its appropriateness.

Purpose of the Study:

  • Evaluate the applicability of LR to BPA methods and propositions.
  • Identify challenges and propose directions for wider LR adoption in BPA.

Main Methods:

  • Comparative analysis of BPA scope and methods against LR applicability criteria.
  • Review of scientific literature and current practices in BPA.

Main Results:

  • BPA's focus on activities and scientific gaps complicate direct LR application.
  • Reliance on diverse methods in BPA presents challenges for standardized LR use.
  • Recent fluid dynamics research offers a pathway for LR implementation.

Conclusions:

  • An LR framework is fully applicable to BPA.
  • Facilitating LR use requires research in underlying physics, data sharing, and statistical training.