Probabilistic Genotyping Expert Testimony; Communication, Challenges, and Examples

Monday September 23rd, 2019 // 8:30 am - 5:00 pm // Catalina

Early Registration (before July 15, 2019)$225
Standard Registration$250

Registration fees include breakfast and lunch.


Probabilistic genotyping methods for the interpretation of mixed DNA profiles are now accepted and are in widespread use by the forensic community. Thousands of cases using probabilistic genotyping methods have been presented in the courts around the US. This workshop uses real examples to demonstrate how to communicate PG evidence in court, common challenges to PG evidence and common lines of questioning.


Learning Outcomes:

  1. Gain an understanding of how probabilistic genotyping works, in particular STRmix
  2. Gain an understanding of likelihood ratios
  3. Learn about admissibility hearings, error, and uncertainty among others


Intended Audience:

Practicing forensic scientists, lawyers, and stakeholders



8:30 – 9:00Mike CobleMixture Issues & Probabilistic Genotyping Basics
9:00 – 10:00Jo BrightContext & Proposition Setting
10:00 – 10:15BREAK
10:15 – 11:15Tamyra MorettiMeaning of the Likelihood Ratio
11:15 – 11:45Steven MyersAccurate Communication of Likelihood Ratios
11:45 – 12:00Overflow and Questions
12:00 – 1:00LUNCH
1:00 – 1:30Rachel OefeleinPreparing for Testimony
1:30 – 2:00Bruce BudowlePresenting & Defending Probabilistic Genotyping Evidence
2:00 – 2:45John BuckletonExperiences with Admissibility of Probabilistic Genotyping
2:45 – 3:00BREAK
3:00 – 3:30Tiffany VasquezProbabilistic Genotyping in the Courts – New York
3:30 – 4:00Sara GreenProbabilistic Genotyping in the Courts – US Army
4:00 – 4:30Susannah KehlProbabilistic Genotyping in Retrospect & the Future – FBI



Jo-Anne Bright

Environmental Science and Research Limited (ESR) New Zealand

Jo-Anne Bright is a Senior Science Leader within the Forensic Biology group at the Institute of Environmental Science and Research Limited (ESR) New Zealand, where she has worked since 1999. Jo is one of the co developers of STRmix™, expert software for the interpretation of forensic DNA profiles and the new Australasian standard.

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Bruce Budowle

University of North Texas Health Science Center

In 2009 Dr. Budowle became Executive Director of the Institute of Applied Genetics and Professor at the University of North Texas Health Science Center at Fort Worth, Texas. He currently directs the Center for Human Identification. His research efforts focus on the areas of human forensic identification, microbial forensics, emerging infectious disease, molecular biology technologies, and pharmacogenetics.

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John Buckleton

Co-Developer, STRmixTM

John's caseworking experience covers 35 years the UK, USA, Australia, Netherlands, and NZ. He has examined over 2,000 cases and testified possibly over 200 times. This includes testimony in NZ, Australia, England, Netherlands and the US.

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Michael Coble

Associate Director, Center for Human Identification, UNTHSC

Michael Coble, PhD, is an Associate Professor and the Associate Director of the Center for Human Identification at the University of North Texas Health Science Center in Fort Worth, Texas. He serves as a member of the OSAC Biological Data Interpretation and Reporting Committee and is an invited guest at the Scientific Working Group on DNA Analysis Methods (SWGDAM).

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Sara Green

Forensic Biologist, Defense Forensic Science Center, US Army Criminal Investigation Laboratory (USACIL)

Sara Green is a Forensic Biologist with the Defense Forensic Science Center in the US Army Criminal Investigation Laboratory (USACIL). Sara has provide training on DNA mixture interpretation using probabilistic genotyping to crime labs throughout the U.S. as part of a training team funded by the N.I.J. Her courtroom experience includes testifying in federal court, U.S. military court, and the Commonwealth of Pennsylvania.

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Susannah Kehl

DNA Technical Leader, FBI Laboratory

Ms. Susannah Kehl is the DNA Technical Leader for the FBI Laboratory. She has testified in over 60 criminal proceedings in state, federal, and military courts across the United States and its territories. Ms. Kehl is a member of Scientific Working Group for DNA Analysis Methods (SWGDAM), the NDIS board and the Organization of Scientific Area Committees (OSAC).

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Lilly MorenoChair

Research Biologist, DNA Support Unit, FBI Laboratory

Dr. Moreno plays an integral role in the Rapid DNA testing and advancement efforts at the FBI, and oversees evaluation and validation efforts pertaining to Probabilistic Genotyping, Next Generation Sequencing technology and other chemistries and technologies in support of the Biometric Units at the FBI.

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Tamyra Moretti

Research Biologist, DNA Support Unit, FBI Laboratory

Tamyra Moretti is a Research Biologist for the DNA Support Unit of the Federal Bureau of Investigation Laboratory.  In 1996, Dr. Moretti joined the FBI Forensic Science Research Unit where she performed research, development and validation of PCR-based methods for the analysis of nuclear and mitochondrial DNA.  She has lectured extensively and trained forensic scientists and attorneys throughout the U.S. and internationally. 

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Steven Myers

California Department of Justice Jan Bashinski DNA Laboratory

Mr. Steven Myers has 30 years of experience in the field of forensic serology and DNA analysis. For the past 28 years, he has been employed by the California Department of Justice Jan Bashinski DNA Laboratory. Mr. Myers’ primary duties over this time have been casework and method development, as well as teaching through Cal DOJ’s California Criminalistics Institute.

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Rachel Oefelein

DNA Labs International (DLI)

Rachel Oefelein is currently the Quality Assurance Manager/Senior DNA Analyst at DNA Labs International (DLI). Her courtroom experience includes testimony in four Florida counties, two states and three countries including misdemeanor and felony trials as well as both Arthur and Daubert hearings. 

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Tiffany Vasquez

Assistant Technical Leader, Department of Forensic Biology, New York City OCME

Tiffany Vasquez is an Assistant Technical Leader at the New York City OCME in the Department of Forensic Biology. Tiffany has written or reviewed thousands of cases in a variety of crime types and has testified in both state and federal jurisdictions within the City of New York.

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