Double Loop Podcast

About 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.

Publisher

Glenn Langenburg and Eric Ray

Category

education · education

Language

en

Explicit

No

First episode

10 Sept 2013

Latest episode

13 Aug 2026

Latest episodes

4 of 161 episodes have a transcript.

1. 

   13 Aug 2026

   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 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

2. 

   17 Jul 2026TRANSCRIPT

   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 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 to answer an activity level question did not violate the defendant's right to confrontation" from the Journal of Forensic Sciences (2026; 71:1063-1069) by Ted Hunt.  The paper reviews a U.S. Court's reaction to a DNA Analyst who refused to offer any testimony regarding activity level and DNA.  Then they discuss a Minnesota case in which Cindy testified for the defense, where the State lab was attempting to introduce a complex 5+ person mixture of DNA from firearms [MN v. Exavier Porter; 55-CR-22-7394].  Defense was ultimately successful in excluding the evidence from trial.  Finally, they discuss a second Minnesota case, in which Cindy testified, where the State was attempting to introduce another complicated mixture from a firearm, and make inferences about activity level [MN v. Garry Bell; 62-CR-24-1146].  The evidence was suppressed in this case as well.  The guys make parallels to the fingerprint community and why it's important that fingerprint experts pay attention to these issues popping up in DNA. Episode References: DNA Mavens: https://dnamavens.com/ Cindy's email: ccale@dnamavens.com Hunt TR. DNA analyst's refusal to answer an activity level question did not violate the defendant's right to confrontation. J Forensic Sci. 2026; 71: 1063–1069. https://doi.org/10.1111/1556-4029.70266 Minnesota v. Exavier Porter; 55-CR-22-7394 order: https://forensicresources.org/resources/state-v-porter-memorandum-and-order-mn-2025/ Minnesota v. Gerry Bell; 62-CR-24-1146, Ramsey County, St. Paul, MN Minnesota v. Alexander Taylor; 69DU-CR-19-2984, St. Louis County, Duluth, MN USA (EDNY) v. Tyler Scott Johnson; 1:23-cr-00013-NRM, Brooklyn, NY. Samie, Taroni, Champod (2020) Estimating the quantity of transferred DNA in primary and secondary transfers (Sci & Just 60:128-135).  https://doi.org/10.1016/j.scijus.2019.09.008 Cale, C.M., et al. (2016) Could Secondary DNA Transfer Falsely Place Someone at the Scene of a Crime?  J For Sci 2016; 61(1): 196-203  doi: 10.1111/1556-4029.12894.

3. 

   3 Jul 2026

   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 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 critical requirements and recommendations, etc. ASB Standard 015, First Edition 2024 Standard for Examining Friction Ridge Impressions https://www.aafs.org/sites/default/files/media/documents/015_Std_e1.pdf ASB Best Practice Recommendation 166, First Edition 2024 Best Practice Recommendation for Comparison and Evaluation of Friction Ridge Impressions https://www.aafs.org/sites/default/files/media/documents/166_BPR_e1.pdf

Inside a recent episode

Episode 294: Cindy Cale Interview and DNA Activity Level

Published 17 Jul 2026 · Transcript excerpt

[…] They might contribute very little DNA. And a person who had barely any contact might have contributed more than everyone else combined together. I think that range was really shocking to us. Yes. And I mean, I even saw that in my own studies, just even like the same people maybe on a different day would leave behind different amounts of DNA and even performing the same activity, I would get such variable amounts of DNA and different DNA profiles just from whatever activities were happening. And that kind of leads to the other sample that was in the Rochester case. So there was the, I think the magazine, it quanted at 180 picograms. […]

Reach and audience

Public platform figures. Ratings count people who left a rating, not total listeners.

Apple Podcasts (US)

4.7 / 5

75 ratings

Spotify

5.0 / 5

16 ratings

Podcast Authority Score: 62 / 100

A composite of feed quality, social presence, YouTube performance and engagement. Read the methodology.

Quality

85

Social presence

91

YouTube

0

Engagement

51

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Guest appearances

Books guests

Based on episode analysis; this does not confirm that the show is currently accepting guests.

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