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Solving sexual assault cases using DNA mixture evidence

Published byΖωή Βονόρτας Modified over 5 years ago

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Presentation on theme: "Solving sexual assault cases using DNA mixture evidence"— Presentation transcript:

1 Solving sexual assault cases using DNA mixture evidence
National Sexual Assault Kit Initiative (SAKI) National Institute of Justice March, 2018 Mark W Perlin, PhD, MD, PhD Cybergenetics Pittsburgh, PA Cybergenetics © Cybergenetics ©

2 Mixed results eye of newt toe of frog Double, double toil and trouble

3 Current incentives • Process rape kits • Produce DNA data
• Solve easy mixtures • Many “inconclusive” Funding for work done

4 DNA success eye of newt toe of frog Separate mixtures
Get match strength

5 Incentives for success
• Get information • Search database • Find criminals • Free innocent • Win justice • Prevent crime Funding for information found

6 California serial rape
DNA investigation California serial rape 8 mixture items vs. 5 victims + 1 suspect BRJ DNA match statistics corroborate victim statements

7 DNA prosecution New York daughter rape

8 inside of pistol barrel
Louisiana pistol rape Item Description 1B Victim 2 Defendant A 11 Defendant B 9T2 inside of pistol barrel 6.07 3.20 13.80

9 Indiana college rape Item Description 001A1a Defendant A 002A B 005A1 Victim 1 006A1 Victim 2 014A C 013A2 Unknown person 004A2 Condom, non-sperm fraction 3.14 18.35 012A1 Handgun grip (TWG94487) 7.59 13.72 012A2 Trigger/trigger guard (TWG94487) 6.36 18.66 013A1 Handgun grip (TFW00049) 1.21 7.30 6.44 7.67 Trigger/trigger guard (TFW00049) 1.71 2.25 =

10 Why DNA prosecution fails
Rape kits are processed, but: Data isn’t used Mixtures aren’t separated Genotypes aren’t found Matches aren’t reported Evidence isn’t produced Results aren’t explained

11 Indiana rape exoneration
DNA exoneration Indiana rape exoneration April 25, 2016 CBS News 48 Hours “Guilty Until Proven Innocent” Database?

12 Why DNA investigation fails
Rape kits are processed, but: Data isn’t used Mixtures aren’t separated Genotypes aren’t uploaded Database isn’t searched

13 DNA database we have Evidence Reference Allele database
Match Upload Upload Crime scene Possible suspect + Unseparated mixtures

14 DNA database we need Evidence Reference Genotype database
Match Upload Upload Crime scene Possible suspect + Separated genotypes

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

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