Latent Print Training

Ray Forensics provides exceptional training for latent print examiners. The courses are designed to be innovative, effective, and interactive. Upon course completion, attendees will be able to immediately apply what they’ve learned to become better latent print examiners. Ray Forensics has provided quality training to latent print examiners across the country. Contact Eric Ray to bring Ray Forensics training to your agency.

Conference Presentations

Standards and Reducing Errors

Contact Eric Ray to bring this class to your agency.

This intermediate to advanced level course is designed to increase a latent print examiner’s understanding and confidence in the exclusion decision. The ACE process has striking differences when used to reach an Exclusion decision as opposed to reaching an Identification decision. This course examines the Analysis, Comparison, Evaluation, and Verification stages and how they relate to the Exclusion decision. The appropriate use of the Inconclusive decision is also discussed. The course offers practical comparison exercises as well as examples of erroneous exclusions from casework. Students will discuss options for an exclusion standard and learn to approach exclusions in a new way to avoid the most common error in latent fingerprint comparison.

Course Objectives:

  • Discuss ACE-V as it applies to exclusions
  • Understand the exclusion decision
  • Compare different exclusion standards
  • Prepare effective protocols incorporating the exclusion decision
  • Obtain confidence in your exclusion decisions
  • Study recent publications on accuracy and errors
  • Determine factors that increase the chance of error
  • Practice with exclusion and inconclusive decisions
  • Obtain confidence in your exclusion decisions


  • Eric Ray has been a Forensic Scientist in the Latent Print field since 2007 and is a Certified Latent Print Examiner. He earned a BS in Biochemistry and Molecular & Cellular Biology from the University of Arizona. As a member of the IAI, Eric is on the Editorial Board of the JFI. Eric has chaired the IAI Special Committee on Latent Print Probability Modeling and was a member of the OSAC Friction Ridge Subcommittee. Eric has published and presented extensively on Reducing Erroneous Exclusions. In his spare time he also co-hosts the Double Loop Podcast, an online program on fingerprint topics.


  • Penny Dechant has been a Forensic Scientist with the Arizona Department of Public Safety in 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 and CLPE with the IAI. Currently, Penny is the Technical Leader for the Latent Print Unit at AZDPS and serves as the Chairman of the Board for the Arizona Identification Council. You can contact Penny Dechant directly at

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