Practical Application of the Likelihood Ratio

Sunday September 12th, 2021 // 1:00 pm - 4:00 pm // Monterrey Rooms 1-3

In-Person Registration$125.00
Virtual Registration$125.00

Fee includes materials. We encourage early registration and will be waiving cancelation penalties for 2021.


This workshop will give the audience an introduction to the assignment of the likelihood ratios (LR) for single source and mixed DNA profiles. Attendees will become familiar with the mathematical models and calculations for LRs from probabilistic genotyping software. Advanced examples including LRs for small pedigrees will be explored.  We will cover how to report LRs with emphasis on avoiding fallacies (including the transposed conditional or prosecutor’s fallacy). Worked examples will help the attendees understand the theoretical concepts.  Attendees should have a solid understanding of algebra and bring a calculator to the workshop. Handouts will be provided.


Learning Outcomes:

  • Calculating LRs for mixtures
  • Calculating LRs for small pedigrees
  • Verbalising the LR


Intended Audience:

This workshop is intended for DNA analysts, supervisors, technical leaders, attorneys and judges. A foundation in Algebra is required.


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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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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