The examiner looking at the dead man’s hands in July 1934 saw what any fingerprint technician would notice immediately: the fingertip ridges had been deliberately damaged. Sections of the central pattern areas were obscured by scarring. The skin showed clear evidence of chemical treatment — acid burns that had been intended to erase the unique patterns that law enforcement had been matching to crime scenes and criminal records for decades.
The damage was real. But it was not complete.
Surrounding the scarred central zones, toward the edges and outer margins of the fingertips, the ridge detail survived. Enough survived that the examiner could place the impressions alongside the known fingerprint card for John Herbert Dillinger, the Indiana-born bank robber whom the FBI had been chasing for more than a year, and confirm: the patterns matched. The man lying in the Cook County morgue on the morning of July 23, 1934 — the man FBI agents had shot the night before as he left Chicago’s Biograph Theater — was, the fingerprints confirmed, John Dillinger.
The identification closed the central question of the most sensational manhunt in American law enforcement history up to that point. But it also demonstrated, in a way that law enforcement publicists would note for years afterward, something that every criminal who had ever attempted to remove their fingerprints had been wrong about: the patterns are more durable than the chemicals used to destroy them, and the edges of a print tell as much of the story as the center.
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## Who John Dillinger Was