Applying a Casework Assessment and Interpretation Approach to Probabilistic Genotyping Results Workshop

Monday October 31st, 2022 // 8:30 am - 5:00 pm // Annapolis 1-3

Early Registration$245.00
Standard Registration$295.00
Virtual Registration$125.00


This workshop will give the audience an introduction to casework assessment and interpretation (CAI) approaches for reviewing the outputs (including the likelihood ratio) and diagnostics of probabilistic genotyping software used for the analysis of forensic DNA mixtures. CAI methodology is a formal model for the evaluation of evidence in a balanced, logical, robust and transparent manner.

We will describe the various diagnostics and outputs from such software and give guidance on the assessment of results by way of examples. We will explore issues such as the number of contributors, relatives, and stochastic effects within a mixture. Handouts will be provided.


Learning Outcomes:

  1. Improved post-software interpretation of results.
  2. The importance of the review of diagnostics and outputs of PG software for casework.
  3. Provide guidance for a systematic and holistic approach to evaluating diagnostics
  4. Demonstrate an increased confidence for interpreting challenging samples from PG software.


Intended Audience:

This workshop is intended for DNA analysts, supervisors, technical leaders, attorneys, and judges. Attendees should be familiar with the concepts of likelihood ratios, PG software, and genotype weights.


Tentative Agenda:

Dr. Jo Bright will describe the various diagnostics within the STRmix report, how they are calculated, and their behavior – for both typical and atypical interpretations.

Dr. Michael Coble will describe the generation of genotype weights and likelihood ratios with PG reports.

Ms. Teresa Cheromcha will present casework examples of profiles where atypical weights and diagnostics were observed, their detection and their remediation.


Private: Michael CobleCo-Chair

Executive Director, Center for Human Identification, UNTHSC

Michael Coble, PhD, is an Associate Professor and the Executive Director of the Center for Human Identification at the University of North Texas Health Science Center in Fort Worth, Texas. He is a Fellow of the American Academy of Forensic Sciences and a member of the International Society for Forensic Genetics. He serves as a commissioner of the Texas Forensic Science Commission and is an invited guest at the Scientific Working Group on DNA Analysis Methods (SWGDAM).

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Private: Jo-Anne BrightCo-Chair

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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Private: Teresa Cheromcha

Senior DNA Analyst, DNA Labs International

Teresa has approximately 17 years of forensic molecular biology experience. Her forensics career began at a biodefense laboratory in 2004, transitioned to human genetics in 2007 at the Armed Forces DNA Identification Laboratory, and continued in the biological sciences unit with the Colorado Bureau of Investigation from 2011-2021 where she served as the Assistant DNA Technical Leader for four years. 

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