This workshop is intended for analysts/supervisors/technical leaders from laboratories that have not yet taken the plunge into probabilistic genotyping software, but are interested in learning more about these programs – what they do, how they work, and why should we be interested in moving toward these methods of interpretation.
DNA mixture interpretation of evidence from sexual assaults or volume crimes such as burglaries – especially when the stain is degraded or compromised – can be challenging for the forensic scientist to decipher. In the US, the Scientific Working Group on DNA Analysis Methods (SWGDAM) released their revised STR Interpretation Guidelines in 2010, and updated these guidelines recently, to provide the forensic DNA community with principles and guidance for mixture interpretation.
For the first two days of this workshop, the focus will be on methods to move beyond the present use of thresholds (such as an interpretation or stochastic threshold) to include probabilistic modeling of mixtures. We will start on day one with a review of probability, Bayes Theorem, and derive the Likelihood Ratio (LR). We will discuss the many elements associated with the LR such as setting propositions, verbalizing the LR, and population genetic models used in forensic calculations. Examples and individual/group exercises will help the attendees understand the theoretical concepts.
On day two, we will discuss probabilistic methods to mixture interpretation and examine the two approaches to probabilistic interpretation: the discrete (semi-continuous) and fully-continuous approaches. Attendees should have a solid understanding of algebra and bring a calculator to the workshop.
The second part of the workshop will have speakers from three different agencies who are using probabilistic genotyping on casework, discussing the ‘nuts and bolts’ of their training programs and implementation of PG, including validation, training of the analysts, prosecutors, and defense attorneys. These discussions will also include how long it took, is everyone trained or just some analysts, what types of cases PG is used on (or whether on all case), some case examples using probabilistic genotyping, and discussion of explaining it in court.
Monday, April 24, 2017 - Thursday, April 27, 20178:00am to 5:00pm Monday - Wednesday, 8:00am to 12:00pm Thursday
Sheraton Milwaukee Brookfield Hotel375 S. Moorland RdBrookfield, Wisconsin 53005262-364-1100
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