A later case — Robert Phillips, who in 1941 had skin grafted from his chest onto his fingertips in an attempt to permanently remove his prints — demonstrated Updegraff’s point about the limits of grafting: Phillips was still identified through ridge detail around the grafted areas and on other joints of his fingers. The patterned skin had not been completely eliminated even by the more radical procedure.
Dillinger’s case was simply a less sophisticated version of the same failing. The acid and scraping produced partial surface alteration that healed back toward the original pattern. The surviving ridges were enough for the examiner.
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## The Federal Bureau and the Dillinger Effect
The Dillinger case had consequences for the FBI that extended well beyond the specific manhunt. Director Hoover had been building the Bureau’s public reputation carefully throughout the early 1930s, casting his agents as professional, college-educated, scientific investigators who represented a new kind of law enforcement — in contrast to the local and state police who were often corrupt, underfunded, or politically compromised.
The Dillinger case was central to this narrative — but its evolution created significant pressure. The Little Bohemia disaster in April 1934 had exposed the Bureau as capable of dramatic failures. The botched raid had killed a civilian and an FBI agent while the actual criminals escaped into the woods. Editorial cartoonists and critics had a field day.
The Biograph Theater outcome on July 22, 1934, restored the narrative Hoover wanted. After more than a year of pursuit, federal agents had located, identified, and shot the most famous criminal in America. Purvis lit his cigar, the agents moved, and Dillinger went down. The resolution was the kind of clean, decisive outcome that played well in newspaper accounts and newsreel footage.