In this episode Glenn and Eric catch up after some hectic travel from recent weather issues.  They do some news updates and also Eric had advice for new Patreon subscribers.  Then they play an Oscar-themed round of “A Truth, a Lie, and a Mandela Effect” because it is the weekend of the 2025 Oscars.  Then the guys tackle a topic which has come up many times in the past, but they’ve never actually dived into before: Simultaneous Impressions.  They talk about different scenarios that can occur such as: some impressions stand alone, none stand alone, aggregation of features, and physical gaps or voids in an impression.  They review the famous Mass v. Patterson case from 2005 that started the initial controversy in the field.  They also have a chance to discuss John Black’s JFI research article from 2006 and other source material on the subject.

Reference:
Black, J.P. Pilot Study: The Application of ACE-V to Simultaneous (Cluster) Impressions.  Journal of Forensic Identification, 56(6) Dated: November/December 2006 Pages: 933-971.



Episode 279 - Simultaneous Impressions

In this episode, Glenn and Eric start with a quick game of “A Truth, A Lie, and a Mandella Effect”.  Then they pose a question from a listener regarding interest in  a forum where listeners can go and discuss the episodes of the show, ask questions, and chat “amongst themselves”.  Finally they get to the long awaited Noblis/FBI study “Black Box 2” latent fingerprint error rate study.  This is a re-do of the 2011 black box study for latent fingerprint performance.  This study “Accuracy and reproducibility of latent print decisions on comparisons from searches of an automated fingerprint identification system” by Hicklin, Richetelli, Taylor and Buscaglia (For Sci Intl, 370 (2025), 112457), reported the performance of 156 U.S. latent print examiner participants each reviewing about 100 latent prints/comparisons resulting in over 14,000 trials.  The study reports numerous statistics of performance such as sensitivity (63%), specificity (70%), false positive error rate (0.2%), and false negative error rate (4.2%).  The guys also discuss some important study design differences, plus there are a lot of data in the appendices.  Finally they talk about the number of false positives made in the study (n=23) and the fact that 13 of those 23 were made by one participant and how that impacted the results.

Article is available for free at:
https://doi.org/10.1016/j.forsciint.2025.112457



Episode 282 - Noblis-FBI Black Box 2 Fingerprint Study

Whether you're a practicing Latent Print Examiner or you're interested in forensics and true crime, the Double Loop Podcast is a weekly show featuring Glenn Langenburg and Eric Ray discussing latent print topics, current events in forensic science, the newest research articles, interesting guests, and analysis of notable cases from a forensic scientist perspective.

New tracks tagged #ACE-V