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Relatedness and DNA: are we taking it seriously enough?
John Buckleton1, Christopher M Triggs
1ESR, The New Zealand Forensic Science Service, P.B. 92021, Auckland, New Zealand. john.buckleton@esr.cri.nz
Forensic Science International
|June 28, 2005
Summary
Forensic DNA labs should routinely report sibling match probability. Increased DNA testing power reduces match probabilities, altering the balance between related and unrelated individuals.
Area of Science:
- Forensic Science
- Genetics
- Statistical Analysis
Background:
- Current forensic DNA practices typically report match probability for unrelated individuals.
- Match probability for relatives is usually provided only upon request.
- Advancements in DNA multiplexes have significantly reduced estimated match probabilities.
Purpose of the Study:
- To address the changing balance of match probabilities due to increased DNA testing discrimination power.
- To propose a revised reporting practice for forensic DNA evidence.
Main Methods:
- Analysis of the impact of increased DNA multiplex discrimination on match probability calculations.
- Comparison of match probabilities between unrelated individuals and relatives (specifically siblings).
Main Results:
- Reduced match probabilities for both related and unrelated individuals have been observed.
- The relative balance between unrelated and related match probabilities has shifted.
- The discriminatory power of current DNA multiplexes is higher than previously.
Conclusions:
- Routine reporting of sibling match probability is recommended when a non-excluded sibling exists.
- This change aims to provide a more accurate and informative assessment of DNA evidence in forensic casework.
- The practice aligns with the increased discriminatory power of modern forensic DNA analysis.