Challenging DNA Evidence The Fifth Judicial District of Pennsylvania Criminal Division February, 2015 Pittsburgh, PA Mark W Perlin, PhD, MD, PhD Cybergenetics,

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Presentation transcript:

Challenging DNA Evidence The Fifth Judicial District of Pennsylvania Criminal Division February, 2015 Pittsburgh, PA Mark W Perlin, PhD, MD, PhD Cybergenetics, Pittsburgh, PA Cybergenetics ©

National Academy of Sciences Among existing forensic methods, only nuclear DNA analysis has been rigorously shown to have the capacity to consistently, and with a high degree of certainty, demonstrate a connection between an evidentiary sample and a specific individual or source. However,... there may be problems... with how the DNA was... interpreted, such as when there are mixed samples "Strengthening Forensic Science" (2009), page 100.

DNA biology Locus Chromosome Nucleus Cell

Short tandem repeat Take me out to the ball game take me out with the crowd buy me some peanuts and Cracker Jack I don't care if I never get back let me root root root root root for the home team, if they don't win, it's a shame for it's one, two, three strikes, you're out at the old ball game "root" repeated 10 times, so allele length is 10 repeats 23 volumes in cell's DNA encyclopedia DNA locus paragraph

DNA genotype 10, ACGT A genetic locus has two DNA sentences, one from each parent. locus Many alleles allow for many many allele pairs. A person's genotype is relatively unique. mother allele father allele repeated word An allele is the number of repeated words. A genotype at a locus is a pair of alleles

Simple DNA evidence Evidence item Evidence data LabInfer Evidence genotype 10, 12 DNA from one person

DNA match statistic Evidence item Evidence data LabInfer Evidence genotype Known genotype 10, 12 Compare DNA from one person 1 Prob(coincidental match)

DNA mixture eye of newt toe of frog Double, double toil and trouble

DNA mixture interpretation Evidence item Evidence data LabSeparate Evidence genotypes DNA from two people 10, 20% 11, 30% 11, 50% + 10, 12

DNA match statistic Evidence item Evidence data Lab Contributor genotype Known genotype 10, 20% 11, 30% 11, 50% 11, 12 Compare DNA from two people Prob(evidence match) Prob(coincidental match) Separate