No two people have been found to share identical fingerprints, including identical twins, although the uniqueness of fingerprints has not been proven formally across all humans.

Is it true that no two people have been found to share identical fingerprints, including identical twins, although the uniqueness of fingerprints has not been proven formally across all humans?

Partly. One source reports probability estimates suggesting duplicate fingerprints are mathematically possible but extremely unlikely in practice, and a twin-fingerprint study addresses distinctiveness among identical twins. Another source argues that with a large enough population identical fingerprints are almost guaranteed, so the evidence only partially covers the claim and points both ways.

Verdict: CONTESTED PARTIAL · 2 sources for, 1 against · Last checked 2 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Does everyone have a unique set of fingerprints?. (2014). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/23032/does-everyone-have-a-unique-set-of-fingerprints

How Often are Fingerprints Repeated in the Population? Expanding on Evidence from AI With the Birthday Paradox. (n.d.). arxiv.org. https://arxiv.org/html/2412.13135v1

Fingerprint Recognition with Identical Twin Fingerprints - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.1371/journal.pone.0035704