120 episodes

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.

Double Loop Podcast Glenn Langenburg and Eric Ray

    • Natural Sciences
    • 5.0, 3 Ratings

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.

    Episode 215 - Aging Latent Prints

    Episode 215 - Aging Latent Prints

    Eric and Glenn wrap up their “activity level series” by discussing two articles (Girod, et al. 2016; and Hinners, et al. 2020) which propose determination of aging of latent fingerprint residue. The techniques use instrumental techniques to identify breakdown products of various fatty components in latent print residue, and use these results to classify whether a latent print is a couple of days old, or older (up to a week or month old depending on the paper). This is a nice finale to the series to explore what the realities and limitations of aging latent prints entails, rather than relying on visual inspection and qualified “consistent with” statements that previous episodes revealed could be misleading or just plain wrong. Glenn also starts the show by relaying a little bit of his experience joining the new NIST/NIJ Human Factors Expert Working Group on DNA mixture interpretation.

    • 55 min
    Episode 223 - Luke Ryan Interview - Mass Drug Scandal Part 3

    Episode 223 - Luke Ryan Interview - Mass Drug Scandal Part 3

    In the final and third part of the series on the Massachusetts drug scandals and Netflix documentary, we interview Luke Ryan, the defense attorney featured in the documentary and who represented several of the clients affected by the scandal. Luke described how and why he fought to uncover the truth that was being swept under the rug by the Attorney General’s office. We also discussed a number of other issues that were not shown in the documentary, including deliberate and willful collusion by the drug chemists to mislead the court, the results of a quality audit that occurred, and early signs that drug chemists were engaged in misconduct for years. Luke also shared his views on a number of criminal justice and social issues such as civil forfeitures, the war on drugs, discovery of predicate questions, and field test kits for narcotics. Settle in for a super-sized episode uncovering the unbelievable and fantastic story behind the Netflix documentary and the perfect storm that could allow such behavior to go unchecked for years.

    • 1 hr 56 min
    Episode 222 - How to Fix a Drug Scandal Documentary - Part 2

    Episode 222 - How to Fix a Drug Scandal Documentary - Part 2

    Eric and Glenn finish out their discussion of the new Netflix documentary “How to Fix a Drug Scandal” (2020). In this episode we switch our focus on the dry-labbing of drug tests by Annie Dookhan, and how long it took for those tests and convictions from those test to finally get tossed. The episode concludes with the story of Luke Ryan and his crusade to finally find the evidence that clearly demonstrated that Sonja Farak had been using drugs for years and not just months.

    Join Glenn and Eric on Discord for virtual Latent Print Examiner Happy Hour, Wednesdays 8-10PM EST (5-7PM PST) during the Shelter in Place orders (discord.gg.b39pp6j).

    • 1 hr 15 min
    Episode 217 - Forensic Movie Recommendations during COVID-19

    Episode 217 - Forensic Movie Recommendations during COVID-19

    In the wake of COVID-19 and so many of us staying at home, we decided as an April Fools’ Episode to make a list of movies that we enjoy and feature an aspect of forensic science. Eric and Glenn run down our top 10 movies (with two “so bad, they’re good” recommendations) and a few honorable mentions for you to consider while deciding what movies or shows to binge. We also alert listeners at the end to a call for research, regarding a new “verification practices” survey that you can take.

    • 1 hr 19 min
    Episode 221 - How to Fix a Drug Scandal Documentary - Part 1

    Episode 221 - How to Fix a Drug Scandal Documentary - Part 1

    In the first of two episodes, Glenn and Eric discuss Netflix’s “How to Fix a Drug Scandal” (2020), covering the actions and consequences of two Massachusetts drug chemists. In this episode, they mostly focus on the Sonja Farak aspect, who was a drug chemist, addicted to drugs and stealing drugs from her standards cabinet and evidence. The guys discuss the issue of ‘random drug screenings’ of crime lab employees and the lack of other various controls in the U.S. The lack of controls can allow circumstances like this to occur, here and elsewhere, undetected for a long time. They also share some personal experiences from their past related to friends/co-workers with serious drug problems. Also, they remind everyone to join them on Discord for virtual Latent Print Examiner Happy Hour, Wednesdays 8-10PM EST (5-7PM PST) during the Shelter in Place orders (http://discord.gg.b39pp6j).

    • 1 hr 5 min
    Episode 220 - Blind QC Research at HFSC

    Episode 220 - Blind QC Research at HFSC

    In this episode, Eric and Glenn start the show discussing a few kind emails and reviews of this podcast. They also talk about a weekly social event online—an online Happy Hour on Discord for Latent Print Examiners and friends of the show. In the main segment, the guys review Hundl et al. (2019) “Implementation of a Blind Quality Control Program in a Forensic Laboratory” in the Journal of Forensic Sciences. This research paper discusses the results of introducing over 140 realistic ground truth cases, without the analysts’ awareness that the case is a test case, at the Houston Forensic Science Center (HFSC) in Houston, Texas, over a period of several years.

    Join other listeners of the Double Loop Podcast for a LPE Happy Hour on Discord, Wednesdays 5-7pm PDT (8-10pm EDT) at https://discord.gg/b39pp6j

    • 1 hr 4 min

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