Episode 173 – AAAS Report – Final Word

AAAS Report - Final Word

AAAS Report – Final Word

Glenn Langenburg and Eric Ray wrap up the three-part discussion on the AAAS Report on the Quality and Gap Analysis of Latent Fingerprint Examination. Surprisingly, the guys agree with many of the recommendations and conclusions in the document with an occasional quibble or clarification. As was hinted in the past two episodes, there are more serious concerns with the report’s suggested language and proposed limitation of the word “identification“.

Double Loop Podcast with Glenn Langenburg and Eric Ray
Podcast for Latent Print Examiners
Your source for everything about fingerprints
While you’re working on your comparisons, we’ll talk about comparisons

Episode 161 – Koehler Error Rate Article

Koehler Error Rate Article

Koehler Error Rate Article

Glenn Langenburg and Eric Ray follow up from last week’s discussion of Glenn’s recent Daubert hearing with a 2016 article from Jonathan Koehler entitled, Intuitive Error Rate Estimates for the Forensic Sciences. As Glenn suspected, the findings of this article are suspiciously close to the center of the group of choices that participants were presented with. Although there are some larger themes that are interesting, the exact values of the error rate estimates from potential jurors do not match personal experience or even some of the cited prior works.

Double Loop Podcast with Glenn Langenburg and Eric Ray
Podcast for Latent Print Examiners
Your source for everything about fingerprints
While you’re working on your comparisons, we’ll talk about comparisons

Episode 149 – White Box Exclusion Article

White Box Exclusion Article

White Box Exclusion Article

Eric Ray and Glenn Langenburg delve deep into the data from the White Box and Black Box studies regarding the exclusion decision (Factors associated with latent fingerprint exclusion determinations). Ulery, Hicklin, Roberts, and Buscaglia publish this data revealing a strong correlation between exclusion accuracy and the presence of a core or delta in both impressions. Glenn and Eric also look at how minutiae count and latent quality affect exclusion accuracy and then discuss the utility of the decision itself. Interesting stuff.

“These are all great numbers. How do you translate this into a system that the examiner can use during comparison that will help decrease errors, improve consistency between different examiner’s about the conclusion that they reach, and provide a basis for comparison that’s easily convertible into some sort of policy you can write down? You can have a somewhat straightforward rule that that can be implemented and improve all these things.

This is why I strongly believe that if with exclusion that it’s hard to look at these different things. So you find the thing in both prints that’s the same (the delta or the core). If both prints have one, then that’s the same in both. Then look for clear minutiae around it that are different then you have yourself an exclusion. I think that mindset can be written down to improve consistency between examiners and it hits all these things. It hits the core, the delta, the number of minutiae, and the LQ Metric.”

Double Loop Podcast with Glenn Langenburg and Eric Ray
Podcast for Latent Print Examiners
Your source for everything about fingerprints
While you’re working on your comparisons, we’ll talk about comparisons

Episode 112 – Madrid Error – Part 2

Madrid Error

Madrid Error

Glenn and Eric continue through the timeline of the Madrid Error or the Brandon Mayfield erroneous fingerprint identification. The guys learn all sorts of new things from the full OIG report that sometimes reveal a new understanding and sometimes contradict the commonly held beliefs of the public and the experts.

Double Loop Podcast with Glenn Langenburg and Eric Ray
Podcast for Latent Print Examiners
Your source for everything about fingerprints
While you’re working on your comparisons, we’ll talk about comparisons

Episode 111 – Madrid Error – Part 1

Madrid Error

Madrid Error

Glenn and Eric begin a 3-part review of the full report from the Office of the Inspector General (OIG) on the Madrid Bombing or Brandon Mayfield error from the FBI. This episode starts with a general overview and begins looking at the timeline, including some common misconceptions and inaccuracies that have been taught in fingerprint training classes.

Double Loop Podcast with Glenn Langenburg and Eric Ray
Podcast for Latent Print Examiners
Your source for everything about fingerprints
While you’re working on your comparisons, we’ll talk about comparisons