PCAST report • DNA mixture limits 3 contributors 20% fraction

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DNA Identification: Mixture Weight & Inference

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Presentation transcript:

PCAST report • DNA mixture limits 3 contributors 20% fraction • Bitemark • Firearm • Footwear • Hair Cybergenetics © 2007-2016

Transparency in DNA Evidence President’s Council of Advisors on Science and Technology November, 2016 Washington, DC Mark W Perlin, PhD, MD, PhD Cybergenetics, Pittsburgh, PA Cybergenetics © 2003-2016 Cybergenetics © 2007-2016

Pattern evidence A B item item data data computing comparison type

DNA mixtures eye of newt toe of frog Double toil & trouble

TrueAllele solution Unmix the mixture eye of newt toe of frog type Data: use everything, add nothing Objective: never consider suspect reference General: same for investigative & evidentiary

Validation studies

Linear relationship

Inclusion probability 2005 NIST study When not “inconclusive”: 213 trillion (14) 31 thousand (4) Cybergenetics © 2007-2016

Government failure

Random counting

Peer review

Justice April 25, 2016

Transparency • open crime lab data to outside scrutiny • open CODIS database to everyone • DNA mixtures solved ten years ago • no more money for failed government • replace bad government with good science

PCAST agenda Wasteful NIST validation study Impact on justice & injustice • Give NIST & FBI tens of millions of dollars • Concentrate forensic power at NIST • Delegitimize established forensic science • Undermine reliable DNA evidence In Indiana: Forest, Wade, Pinkins In Washington: the problem is the solution

Arbitrary nonscientific limits DNA mixture limits 3 contributors 20% fraction ? NIST recommended limits to PCAST NIST benefits financially from limits NIST benefits politically from limits • Conflict with Daubert factors: testing, error rate, peer-review & general acceptance • Disconnected from papers cited by PCAST • Jeopardize every DNA crime lab process • If best DNA goes, all forensic evidence goes

What you can do • Criminal justice • Public safety • Government waste Meet the new boss

TrueAllele YouTube channel Learn more http://www.cybgen.com/information • Courses • Newsletters • Newsroom • Presentations • Publications • Webinars http://www.youtube.com/user/TrueAllele TrueAllele YouTube channel perlin@cybgen.com