Glenn and Eric kick off the episode with a quick update on their annual Arizona “treasure hunt,” then continue their new “Regional Quirkisms” game with some uniquely Arizona food terms. After the warm-up, they welcome guest Angela Tonietto (Brazilian friction ridge examiner and PhD student at Sam Houston State University) to discuss her recent Journal of Forensic Identification article on palm print pattern frequencies (“Patterning in the Distal Portions of the Palms as a Key to Palm Print Identification“. 2025, 75-3, p.274.).
Angela breaks down what she found when analyzing thousands of palm prints: where loops, deltas, arches, and “no pattern” most commonly appear in the interdigital region, how pattern combinations are far less “random” than the number of theoretical possibilities, and why right and left palms can show strikingly different distributions. The conversation also digs into why this kind of frequency data matters in real casework and court, and where the research could go next, including software tools and AI-assisted approaches to palm print analysis. (Link mentioned in episode: demo.hugin.com/example/FingerprintEvidence)
