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Reducing Erroneous Exclusions
by Eric Ray, CLPE - Criminalist, Arizona Department of Public Safety Crime Laboratory
Penny J. Dechant, CLPE - Criminalist / Latent Print Technical Lead, Arizona Department of Public Safety Crime Laboratory
The exclusion decision is a fairly recent change in latent print comparisons, and the discipline is still struggling with how to handle exclusions. Erroneous exclusions are being discovered with surprising frequency in latent print units around the globe. Many labs have begun to verify their exclusion decisions, and this has resulted in errors finally being noticed. Recent research into the decisions of latent print examiners shows that erroneous exclusions are common and inevitable.
So, what training have you had in exclusions? What is enough for an exclusion? What is your lab's standard for exclusion? Is your lab implementing any new Quality Assurance policies to address this problem?
This webinar will review the policy changes that Arizona DPS has implemented in their latent print unit to reduce erroneous exclusions. Examples of erroneous exclusions from casework will be presented along with information on circumstances that might make an erroneous exclusion more likely.
Dechant, Penny - has been employed as a Criminalist with the Arizona Department of Public Safety, assigned to the Latent Print Unit, since 2004. She earned a BS in Chemistry from Northern Arizona University in 1995. Penny worked as a Crime Scene Specialist for the Scottsdale Police Department from 2000 to 2004. Penny is a member of the IAI and is a CLPE. Currently, Penny is the Technical Lead for the Latent Print Unit at AZDPS and serves as the President for the Arizona Identification Council.
Ray, Eric - has been employed as a Criminalist with the Arizona Department of Public Safety in the Latent Print Unit since 2007 and is a Certified Latent Print Examiner. He earned a BS in Biochemistry and Molecular & Cellular Biology from the University of Arizona in 2000. As a member of the IAI, Eric is on the Editorial Board of the JFI and chairs the Special Committee on Latent Print Probability Modeling. He is also the Treasurer and Webmaster for the Arizona Identification Council. With Penny Dechant, Eric has published and presented extensively on Reducing Erroneous Exclusions. In his spare time he also co-hosts the Double Loop Podcast, a weekly show on fingerprint topics. Recently, Eric was named as a member of the OSAC Friction Ridge Subcommittee.
For more information on Eric and Penny's training programme, please visit: http://rayforensics.com/latent-print-training/