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Natural Sciences · Glenn Langenburg and Eric Ray

Double Loop Podcast

by Glenn Langenburg and Eric Ray

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.

Latest episodes

Showing 20 · updated from the feed

Episode 295 - Forensics on YouTube Reaction

Recently, a YouTube science channel discussed five different forensic disciplines and explored potential issues with each. Eric Ray and Glenn Langenburg react to the vide

Aug 13
1 h 06 min

Episode 294: Cindy Cale Interview and DNA Activity Level

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 traini

Jul 17
1 h 26 min

Episode 293_ASB Standards Part 2

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 Ex

Jul 3
44 min

Episode 292 - ASB Standards Part 1

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 S

Jun 8
1 h 12 min

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

May 4
1 h 26 min

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 s

Apr 6
1 h 18 min

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 P

Feb 22
1 h 04 min

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 Irel

Jan 21
1 h 21 min

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

Dec 13 2025
1 h 29 min

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

Sep 30 2025
1 h 42 min

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 N

Aug 12 2025
1 h 08 min

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 o

Jul 28 2025
1 h 28 min

Episode 283 - DNA & Patterns

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 finge

May 26 2025
1 h 09 min

Episode 282 - Noblis-FBI Black Box 2 Fingerprint Study

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 foru

May 10 2025
1 h 22 min

Episode 281 Kasey Wertheim Tribute

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 rememb

Apr 6 2025
1 h 01 min

Episode 280 - Pat Wertheim Tribute

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

Mar 21 2025
1 h 17 min

Episode 279 - Simultaneous Impressions

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 subscriber

Mar 15 2025
1 h 19 min

Episode 278 - Aussie Paper on Examiner Disagreements

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 a

Mar 3 2025
1 h 02 min

Episode 277 - Sarah Chu Interview

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

Jan 14 2025
1 h 10 min

Episode 276 - History Episode - Stories of the Forefathers

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 M

Dec 9 2024
1 h 34 min

Chart trend

Position in the Natural Sciences chart (US), last 90 days.

#57
all-time peak
36
days in the top 100 since Nov 2024

Chart positions

Where Double Loop Podcast ranks today in each Apple Podcasts chart (US, Oct 24, 2026).

#109 NEW Natural Sciences US

What listeners say

A curated, balanced selection of Apple Podcasts reviews.

Amazingly helpful content! I am constantly sharing episodes with my coworkers in the field of forensics. There are useful lessons in the episodes even if you aren’t specifically in the latent print discipline. The hosts are also great trainers.

mazyberry · Jul 2024

I’ve been a avid listening of the DLP for a few years and I have now taken educational courses with both of the hosts which gives me a better understanding of their personalities! Lol! They are both awesome with great perspectives! Grateful that they continue to tackle relevant topics within the discipline and even some popular pop culture topics (like shows, documentaries, etc). I love it when they break down research that comes out in a way that make it easier to understand and articulate. Thank you both for all you do to propel our discipline forward!

Star5521 · Aug 2021

The hosts are great, and there’s a lot of information regarding fingerprint analysis, even fir the layman. While sometimes it can have jargon that you have to have a bit of experience - either in the field or in forensics in general - it’s still a fascinating look at both the mechanics and the techniques in identification, with specific cases sometimes given as examples.

LeoFlash · Jun 2021

Great podcast for anyone in the field of friction ridge examinations. But they also have quite a few episodes on popular true crime cases which they dissect in detail as only two forensic experts can do. At first I came for the episodes on scholarly papers because, I don’t have time to read them and when I do, I don’t understand them. Glenn and Eric do a great job of making sense of these papers for those of us with common levels of intelligence. But I later found I enjoyed the interview and true crime episodes just as much. Thanks guys, take my 5 stars.

Danny 5028 · Jun 2020

It surprises me no one has left a review yet. I enjoy the podcast topics and the hosts are kind of funny at times. The content is relevant and insightful. I enjoy the different points of view from each host based on their positions and vantage points which can differ at times. Thanks for talking and sharing these ideas with others in the field.

Cutthebs · Aug 2017

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