Double Loop Podcast
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.
Episodes
August 12, 2026 • 66 mins
Recently, a YouTube science channel discussed five different forensic disciplines and explored potential issues with each. Eric Ray and Glenn Langenburg react to the video and share their perspectives as forensic scientists from valid criticisms to misunderstandings. Have we really been "Using The Wrong Science In Court For 50 years"? Watch the full original video here: https://www.youtube.com/watch?v=mvcesPWvUIc
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July 16, 2026 • 86 mins
In this episode, the guys start off with Regional Quirkisms from the Land Down Undah. They then interview Cindy Cale, DNA expert from DNA Mavens, a consulting and training company in Houston, TX. Cindy will discuss 3 topics, all related to testimony of the activity level, with respect to DNA, as well as discuss validation issues in DNA.
They first discuss a recent DNA testimony case report titled "DNA analyst's refusal ...
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July 2, 2026 • 44 mins
Eric and Glenn finish this two-parter episode about ASB Standards and Best Practice Recommendations. Specifically, in Part 2, they cover ASB Standard 015 "Standard for Examining Friction Ridge Impressions" (2024) and ASB Best Practice Recommendation 166 "Best Practice Recommendation for Comparison and Evaluation of Friction Ridge Impressions" (2024). The guys discuss how to use the standards, their own experiences, some of the ...
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June 7, 2026 • 72 mins
Eric and Glenn start off this supersized two-parter topic with a Regional Quirkisms game of Canadian-isms. Then they move past the Great White North and talk about ASB Standards and Best Practice Recommendations. Specifically, they cover ASB Standard 015 "Standard for Examining Friction Ridge Impressions" (2024) and in Part 1, cover ASB Best Practice Recommendation 165 "Best Practice Recommendation for Analysis of ...
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May 4, 2026 • 86 mins
Eric and Glenn start the episode with a listener email and then play a numbers themed game of Regional Quirkisms. For the topic of this episode, the guys discuss a 2025 paper from Simon Cole and Justin Sola titled "First impressions matter: Mundane obstacles to a forensic device for probabilistic reporting in fingerprint analysis". The article discusses practical and realistic obstacles and hurdles to developing a valid...
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April 5, 2026 • 78 mins
In this episode, the guys start off with some Michigan Regional Quirkisms. They then review a 2024 paper titled "The effects of cognitive bias, examiner expertise, and stimulus material on forensic evidence analysis" by Michelle Pena, Stephanie Stoiloff, Maria Sparacino, and Nadja Schreiber Compo, from the Journal of Forensic Sciences (2024; 69:1740-1757). The research paper provided lay participants (students) an...
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February 22, 2026 • 64 mins
Glenn Langenburg and Eric Ray interview Angela Tonietto about her recent article on the frequency of patterns in palm prints. ("Patterning in the Distal Portions of the Palms as a Key to Palm Print Identification". 2025, 75-3, p.274.) The research analyzes the frequency of loops and deltas in the interdigital area and compares the results to past research. (Link mentioned in episode: https://demo.hugin.com/example/FingerprintEviden...
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January 20, 2026 • 81 mins
Happy New Year 2026! The boys are back in town, with a new game: Regional Quirkisms. After discussing Minnesota quirkisms, the guys answer a listener question from Ireland: "What's the most number of corresponding minutiae that you have seen from two impressions from different sources?". This leads to a deep dive on close non-matches. The guys share their tips, tricks, and red flag warnings for dealing with ...
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December 12, 2025 • 89 mins
Eric Ray and Glenn Langenburg talk about their week in Orlando at the 2025 IAI Educational Conference. Hear about Quality Metrics, limited examinations, and linking cases together, and hear from some of the conference attendees.
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September 29, 2025 • 102 mins
In this episode Eric poses to Glenn a Mandela effect question concerning household cleaning products. After that, the guys celebrate the 4th of July holiday by welcoming their guests from Ireland. Four fingerprint examiners from Forensic Science Ireland (FSI), the national forensic lab in Ireland, join the podcast. The guests are Dr. Aoife Power, Dr. Craig Mullen, Mr. Columb Doherty, and Dr. Kim Connick. ...
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August 11, 2025 • 68 mins
In this episode, the guys start with a product-based Mandela effect question. Then they welcome back long-time friend of the show and webmaster, Michael Whyte from the New South Wales police force in Australia. Michael has a question for Glenn and Eric, regarding latent-to-latent comparisons, using latent prints as 'proxy exemplars' when the exemplars are worse than the latent prints or incomplete, and various off-shoot...
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July 27, 2025 • 88 mins
In this episode, Eric stumps Glenn with a geography based Mandela Effect question. Then the guys welcome their guest commentator, Brendan Max, Public Defender and Chief of the Forensic Science Division in Chicago, Illinois. Eric, Glenn, and Brendan take a second look at the 2025 FBI/Noblis follow-up black box study for latent fingerprints. The guys had previously done a cursory review of the paper in Episode 282, and now wanted ...
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May 26, 2025 • 69 mins
Glenn Langenburg and Eric Ray review two articles from Cell that focus on the genetic basis for ridge development and pattern formation. 'The developmental basis of fingerprint pattern formation and variation' by Glover, et al., and 'Limb development genes underlie variation in human fingerprint patterns' by Li, et al. Our understanding of these complex processes continues to grow, and these papers further support our field and our...
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May 9, 2025 • 82 mins
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 r...
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April 5, 2025 • 61 mins
Eric Ray and Glenn Langenburg pay tribute to our colleague and friend. Kasey Wertheim passed away on March 7, 2025 and will be greatly missed. Please join us as we remember his legacy and contributions to the field of fingerprints and tell a few personal stories.
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March 20, 2025 • 77 mins
Eric Ray and Glenn Langenburg pay tribute to our mentor and friend. Pat Wertheim recently passed and will be greatly missed. Please join us as we remember his legacy and tell a few stories.
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March 14, 2025 • 79 mins
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:...
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March 2, 2025 • 62 mins
In this first recorded episode of 2025, Eric and Glenn start with Eric being pedantic in his “A Truth, A Lie, and a Mandela Effect”. The guys catch up on New Year stuff and then launch into a review of a research paper from New South Wales, Australia, titled “How often do fingerprint examiners disagree in routine casework?” by O’Connor and Chapman (2024) from Forensic Science International. Eric firs...
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January 13, 2025 • 70 mins
Glenn and Eric interview Sarah Chu, director of policy and reform with the Perlmutter Center for Legal Justice's (PCLJ) forensic science policy initiatives. Sarah breaks down her doctoral thesis on quality management and oversight in forensic science laboratories.
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December 8, 2024 • 94 mins
In this episode the guys discuss historical figures in the field of fingerprints. At the top of the episode Eric gives Glenn an Australian themed “A Truth, a Lie, and a Mandela Effect”. Glenn tells a couple of stories from his trip to London, which also inspired the topic for the episode. Because of Glenn’s time in Switzerland this fall reading old texts, he learned a lot about the early days of fingerprints. ...
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