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No information from mixture

Published byVeronika Sudjarwadi Modified over 5 years ago

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Presentation on theme: "No information from mixture"— Presentation transcript:

1 No information from mixture
Crime laboratory DNA report Crime lab user fee: $5,000 Conclusions: Item 1 – Swab of textured areas from a handgun The data indicates that DNA from four (4) or more contributors was obtained from the swab of the handgun. Due to the complexity of the data, no conclusions can be made regarding persons A and B as possible contributors to this mixture.

2 Computer reanalysis Cybergenetics TrueAllele report
Match statistic provides information Person A excluded Contributor Unmix the mixture 1 2 400,000 3 Person B included 4

3 Allegheny County: 59 cases, 13 trials, 3 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

4 Countywide DNA database
Pittsburgh Post-Gazette Allegheny County crime lab vying to use more advanced DNA database Technology developed by Cybergenetics gets conclusive results from DNA mixtures February 28, 2014

5 Darryl Pinkins imprisoned
1989 – 5 men raped an Indiana woman Darryl Pinkins and 2 others misidentified 1991 – wrongfully convicted, 65 year sentence 2001 – DNA mixture evidence 2 contributors found, not the accused but 5 were needed, post-conviction relief denied

6 TrueAllele Pinkins findings
1. compared evidence with evidence 2. calculated exclusionary match statistics 3. revealed 5% minor mixture contributor 4. jointly analyzed DNA mixture data 5. showed three perpetrators were brothers found 5 unidentified genotypes, defendants not linked to the crime

7 Pinkins exonerated Indiana April 25, 2016

8 Why crime labs fail on mixtures
• Expertise in forensic biology Great at generating DNA data • Not in computational statistics Poor at interpreting the data • Adversarial nature of court Cross-examination, termination • Strong incentives on lab process Focus on data, not information • Fear of uncertainty, comfort in certainty Saying nothing avoids controversy

9 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

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

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

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