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Uncertainty in the number of contributors in the proposed new CODIS set



Michael D. Coble, Jo-Anne Bright, John S. Buckleton, James Curran


The probability that multiple contributors are detected within a forensic DNA profile improves as more highly polymorphic loci are analysed. The assignment of the correct number of contributors to a profile is important when interpreting the DNA profiles. In this work we investigate the probability of a mixed DNA profile appearing as having originated from a fewer number of contributors for the African American, Asian, Caucasian and Hispanic US populations. We investigate a range of locus configurations from the proposed new CODIS set. We show that the probability of a higher order mixture (five or six contributors) appearing as having originated from one less individual is high. This probability decreases as the number of loci tested increases.
Forensic Science International: Genetics


Forensic DNA, mixed DNA profiles, interpretation


Coble, M. , Bright, J. , Buckleton, J. and Curran, J. (2015), Uncertainty in the number of contributors in the proposed new CODIS set, Forensic Science International: Genetics, [online], (Accessed April 20, 2024)
Created July 16, 2015, Updated November 10, 2018