**1930s Crime Wave blog — Experts Say Dillinger’s Fingerprints Are A Match** (https://1930scrimewave.wordpress.com/2019/10/09/experts-say-dillingers-fingerprints-are-a-match/): Harold Cummins 1935 finding — acid applied mainly to central pattern area, extensive areas of outer fingertip bore enough ridge detail for identification; 2019 comparison by Terry Turbeville (retired NC SBI) and Robert Hallisey (Forensics Unlimited) found 10+ matching identifiers per finger; anonymous retired special agent reported 21+ matching identifiers on right thumbs.
**Frank Report — Who Took Dillinger’s Fingerprints** (https://frankreport.com/who-took-dillinger-s-fingerprints-the-fbi-never-said): FBI fingerprint division memo noted “unexplained differences” attributable to acid damage, positive identification still established from surviving ridges; fingerprint card dated July 22 1934 on Chicago police form with signature illegible; chain of custody of postmortem impressions not fully documented; Stewart Fillmore found no specific record naming the examiner.
**Utterly Interesting — Underworld Plastic Surgery** (https://www.utterlyinteresting.com/post/underworld-plastic-surgery-in-the-public-enemy-era): Surgery location Probasco home over approximately 48 hours; Dillinger swallowed tongue under ether anesthetic and was revived; $5,000 price; Cassidy received $600; kangaroo tendons for cheek tightening; 1935 Journal of Criminal Law and Criminology article finding that at least one millimeter of skin removal required; autopsy showed partially healed surgical results with ridges still intact.
**Mental Floss — Mob Plastic Surgeons** (https://www.mentalfloss.com/crime/mob-plastic-surgeons-erase-fingerprints): Loeser applied hydrochloric acid then scraped; tried procedure on himself first; acid-etched prints still a positive match after Biograph shooting.
**Crime Museum — Dillinger** (https://www.crimemuseum.org/?p=3886): Dillinger burned fingertips with acid late May 1934; faint ridge markings still visible after healing; 1934 Hoover committee of surgeons and dermatologists reported on fingerprint obliteration; Dr. Updegraff concluded permanent obliteration requires skin graft.