The importance of considering common sources of unknown DNA when evaluating findings given activity level propositions

Duncan Taylor, Luke Volgin, Bas Kokshoorn, Christophe Champod

Research output: Contribution to journalArticlepeer-review

Abstract

Evaluating forensic biological evidence considering activity level propositions is becoming more prominent around the world. In such evaluations it is common to combine results from multiple items associated with the alleged activities. The results from these items may not be conditionally independent, depending on the mechanism of cell/DNA transfer being considered and it is important that the evaluation takes these dependencies into account. Part of this consideration is to incorporate our understanding of prevalent DNA and of background DNA on objects and people, and how activities can lead to common sources of unknown DNA being deposited on items. We demonstrate a framework for evaluation of DNA evidence in such a scenario using Object-Oriented Bayesian Networks and apply it to a motivating case from South Australia.

Original languageEnglish
Article number102518
Number of pages10
JournalForensic Science International: Genetics
Volume53
DOIs
Publication statusPublished - Jul 2021

Keywords

  • Activity level
  • Background DNA
  • Bayesian networks
  • Evidence evaluation

Fingerprint Dive into the research topics of 'The importance of considering common sources of unknown DNA when evaluating findings given activity level propositions'. Together they form a unique fingerprint.

Cite this