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Pathology Informatics Summit Association for Pathology Informatics

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Presentation on theme: "Pathology Informatics Summit Association for Pathology Informatics"— Presentation transcript:

1 Transforming DNA Evidence into Reliable Information: Computers, Science and Society
Pathology Informatics Summit Association for Pathology Informatics May, 2017 Pittsburgh, PA Mark W Perlin, PhD, MD, PhD Cybergenetics, Pittsburgh, PA Cybergenetics © Cybergenetics ©

2 National Academy of Sciences
Trouble in River City 2009 Where’s the “science” in Forensic Science?

3 DNA genotype 10, 12 A genetic locus has two DNA sentences,
one from each parent. An allele is the number of repeated words. locus A genotype at a locus is a pair of alleles. mother allele 1 2 3 4 5 6 7 8 9 10 10, 12 ACGT repeated word Many alleles allow for many many allele pairs. A person's genotype is relatively unique. father allele 1 2 3 4 5 6 7 8 9 10 11 12

4 Simple DNA interpretation
Lab Infer Evidence item Evidence data Evidence genotype 10, 12 DNA from one person Compare Known genotype 10, 12

5 Pittsburgh skyline

6 1990 Draw a threshold

7 Same heights & vacant lots

8 Double, double toil and trouble
1995 DNA mixture eye of newt toe of frog Double, double toil and trouble

9 Simplify data to interpret mixture
2000 Simplify data to interpret mixture f1 f2 f3 f4 f5 Apply threshold to find “alleles” Add allele frequencies (f1 + f2 + …) Square sum, take reciprocal Locus “probability of inclusion” (PI) Multiply locus PI values Combined (CPI) match statistic

10 Unreliable DNA mixture statistics
2005 Unreliable DNA mixture statistics NIST (Commerce Department) study in 2005 Two contributor mixture data, known victim When not “inconclusive”: 213 trillion (14) 31 thousand (4) Forensic DNA labs put on notice ten years ago Cybergenetics ©

11 Biased DNA workflow 2010 (1) Choose data (3) Person decides (2)
Calculate statistic • Put people in the process • To overcome software limits • And introduce human bias

12 Falsely identify innocent people
2015 Falsely identify innocent people

13 Mixture statistics shut down labs
“National accreditation board suspends all DNA testing at D.C. crime lab” The Washington Post April 27, 2015 Did not comply with FBI standards “New protocol leads to reviews of ‘mixed DNA’ evidence” The Texas Tribune September 12, 2015 24,468 lab tests affected

14 Statistics lack scientific basis
Misled courts for 15 years on countless DNA mixtures

15 CPI is always a million

16 Average information is zero

17 Uncorrelated with information

18 Inclusion just counts tests
One-sided Match Statistic Truncated Normal Distribution Positive Tail Centered at Zero Uncorrelated with Identification Information Inclusion Distribution Has a Positive Mean Law of Large Numbers Why CPI is Always a Million A subjective one-sided match statistic unrelated to identification information

19 TrueAllele® computer technology
• Accurate. 34 validation studies, 7 published • Objective. Workflow removes human bias • Accepted. Reported in 37 states, used by labs • Transparent. Give math, software (4GB DVD) • Neutral. Can statistically include or exclude

20 Wolfe sisters homicide
On February 6, 2014, Susan Wolfe (44) and her younger sister Sarah (38, left) were killed in their East Liberty home in Pittsburgh.

21 Pennsylvania v. Allen Wade
Thresholds failed to interpret most DNA mixtures Hat No conclusions Cup Insufficient data Fingernails Contamination, insufficient data Gear shift Insufficient data Seat lever Cannot be excluded Knit hat Insufficient data Sock Too complex, no conclusions

22 Pennsylvania v. Allen Wade
The crime lab reported 5 DNA mixture matches TrueAllele found 17 matches on the same data Hat 65.3 thousand Allen Wade Cup 20.5 thousand Susan Wolfe Fingernails 6.06 trillion Allen Wade Gear shift 9.37 million Sarah Wolfe Seat lever 385 billion Sarah Wolfe Knit hat 25.7 thousand Allen Wade Sock 300 Sarah Wolfe

23 Allen Wade Found Guilty On All Counts In East Liberty Sisters’ Slaying
CBS News, May 23, 2016 PITTSBURGH (KDKA/AP) • A man accused of killing two sisters who lived next door to him in East Liberty has been found guilty on all counts. • Allen Wade was accused of shooting Sarah and Susan Wolfe after they returned from work on Feb. 6, 2014, apparently to steal a bank card. • On Monday morning, a jury found Wade guilty of first-degree murder, robbery, burglary and theft by unlawful taking.

24 Pennsylvania v. Allen Wade
Thresholds failed to interpret DNA mixture TrueAllele succeeded on the same data A hat left from a burglary of the Wolfe sister’s home six weeks before the murder matched Allen Wade with a 65.3 thousand statistic Preventable Crime

25 Allegheny County: 59 cases, 13 trials, 4 exonerations
Crime Evidence Defendant Outcome Sentence rape clothing Ralph Skundrich guilty 75 years murder gun, hat Leland Davis 23 years Akaninyene Akan 32 years shotgun shells James Yeckel, Jr. guilty plea 25 years fingernail Anthony Morgan life weapons gun Thomas Doswell 1 year bank robbery Jesse Lumberger 10 years drugs Derek McKissick 2 1/2 years Steve Morgan door, clothing Calvin Kane 20 years fingernail, clothing Allen Wade Jaykwaan Pinckney child rape Dhaque Jones 6 years shooting Anthony Jefferson 4 years Zachary Blair 15 years Delmingo Williams 3 years incest rape Terry L. 40 years hat Robert Schatzman 1 1/2 years Rashawn Walker 1.5 years robbery Lauren Peak body cavity Freddie Cole 2 years Chaz White sex crime Christopher Stavish Jake Knight

26 Darryl Pinkins exonerated
Indiana April 25, 2016

27 Recommendations Open DNA to public scrutiny
Revisit all past DNA mixture cases Educate trial attorneys and judges Fully automate mixture interpretation Extensively validate DNA interpretation Keep methods within their limits Go beyond laboratory limits

28 Non-governmental organization
1. Reanalyze forgotten DNA evidence 2. Educate lawyers, scientists & society

29 TrueAllele YouTube channel
More information • Courses • Newsletters • Newsroom • Presentations • Publications • Webinars TrueAllele YouTube channel

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