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by Glenn Langenburg and Eric Ray
Glenn Langenburg and Eric Ray discuss latent prints, the latest latent print research, forensic science in general, and regular interviews with people in the latent print field.
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- May 4, 20261h 26m
Episode 291 - Mundane Obstacles to Developing a Stats Model
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 validated, accepted, and commercially-available statistical model for fingerprint evidence. The article takes the novel view that most sources cite either "practitioner disinterest" (or worse: practitioner rejection) or lack of push and influence from the Courts, Daubert challenges, or Authoritative bodies. However, once you remove those two obstacles and assume examiner 'buy-in' and Courts pushing for empirical data over subjective examiner expertise, what 'mundane' obstacles exist that most people don't realize or think about? The article discusses a number of surprising, non-trivial obstacles that have a huge influence on the state of statistical model development in the field today. Article: Cole, S.A.; Sola, J.L. First impressions matter: Mundane obstacles to a forensic device for probabilistic reporting in fingerprint analysis. Social Studies of Science (2025), 55(5): 683-710. https://doi.org/10.1177/03063127251333074
- Apr 6, 20261h 18m
Episode 290 - Review of a Bias Research Paper
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) and fingerprint expert participants with images of ground truth, matching and non-matching fingerprint pairs. The researchers controlled the exposure of the participant to contextual case information. Lay participants made a number of errors and seemed to be more impacted by case information compared to experts in these trials. Glenn and Eric discuss why that might be and discuss and compare other studies that might be relevant on this topic. Article: Pena MM, Stoiloff S, Sparacino M, Schreiber Compo N. The effects of cognitive bias, examiner expertise, and stimulus material on forensic evidence analysis. J Forensic Sci. 2024 Sep;69(5):1740-1757. doi: 10.1111/1556-4029.15565. Other Articles Discussed: Tangen, J. M., Thompson, M. B., & McCarthy, D. J. (2011). Identifying fingerprint expertise. Psychological Science, 22(8), 995–997. https://doi.org/10.1177/0956797611414729 Langenburg, G., Bochet, F., & Ford, S. (2014). A Report of Statistics from Latent Print Casework. Forensic Science Policy & Management: An International Journal, 5(1–2), 15–37. https://doi.org/10.1080/19409044.2014.929759
- Feb 22, 20261h 4m
Episode 289 - Angela Tonietto Interview - Palm Patterns
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/FingerprintEvidence)
- Jan 21, 20261h 21m
Episode 288 - Close Non-matches
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 close non-matches. They discuss a few examples and talk about the relevant research on this topic.
- Dec 13, 20251h 29m
Episode 287 - IAI 2025 Review
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.
- Sep 30, 20251h 42m
Episode 286 - Forensic Science Ireland Interview
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. Glenn and the guests talk about their time at the recent European Academy of Forensic Science (EAFS) conference in Dublin in May 2025. The examiners from FSI discuss their research, posters, and presentations from EAFS. Eric is also curious about their new AFIS system and has lots of questions about their processes. The guests discuss forensic fingerprint practices in Ireland and especially working in their new national laboratory. Forensic Science Ireland: https://forensicscience.ie/ Dr. Kim Connick: kconnick@fsi.gov.ie
- Aug 12, 20251h 8m
Episode 285 - Michael Whyte Interview - Latent to Latent Comparisons
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-shoots of these questions. The guys discuss the theoretical basis and some of the legal issues that arise in both the U.S. and Australia.
- Jul 28, 20251h 28m
Episode 284 - Black Box '22 - Part 2 (with Brendan Max)
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 to dig in a bit into the appendices and take another look at some trends. Brendan offers his insights and shows that he’s pretty proficient with a spreadsheet too! The guys go back and forth discussing the strengths and limitations of the study and where the methodology and practice has likely improved since the original Black Box study (conducted in 2009). Article is available for free at: doi.org/10.1016/j.forsciint.2025.112457
About Double Loop Podcast
Glenn Langenburg and Eric Ray discuss latent prints, the latest latent print research, forensic science in general, and regular interviews with people in the latent print field.
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