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Correspondence| Volume 25, e18-e19, November 2016

About the number of contributors to a forensic sample

      According to the ISFG recommendations [
      • Gill P.
      • Brenner C.H.
      • Buckleton J.S.
      • Carracedo A.
      • Krawczak M.
      • Mayr W.R.
      • Morling N.
      • Prinz M.
      • Schneider P.M.
      • Weir B.S.
      DNA commission of the International Society of Forensic Genetics: recommendations on the interpretation of mixtures.
      ], “There is a common misconception that the numbers of contributors under Hp and Hd should be the same. There is no requirement for this” (a footnote further elaborates: “Other things being equal, the aim of the defense is to maximize the probability of the evidence under Hd. Similarly, the prosecution aim is to maximize the probability of the evidence under Hp, consistent with their theory of the case. The number of contributors is a secondary consideration …”).
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      References

        • Gill P.
        • Brenner C.H.
        • Buckleton J.S.
        • Carracedo A.
        • Krawczak M.
        • Mayr W.R.
        • Morling N.
        • Prinz M.
        • Schneider P.M.
        • Weir B.S.
        DNA commission of the International Society of Forensic Genetics: recommendations on the interpretation of mixtures.
        Forensic Sci. Int. 2006; 160: 90-110
        • Evett I.W.
        • Weir B.S.
        Interpreting DNA Evidence: Statistical Genetics for Forensic Scientists.
        Sinauer, Sunderland, Massachusetts, USA1998
        • Haned H.
        • Pène L.
        • Lobry J.R.
        • Dufour A.B.
        • Pontier D.
        Estimating the number of contributors to forensic DNA mixtures: does maximum likelihood perform better than maximum allele count?.
        J. Forensic Sci. 2011; 56: 23-28