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PhotoDNA and false-positive rates

The extremely low false-positive rates of vetted tools like PhotoDNA and the potential risks of perceptual hashes.

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Feb 3, 2026

How do hash-matching and automated tools used by NCMEC affect false positives and case prioritization?

Hash-matching and automated detection tools dramatically reduce the workload of human reviewers by filtering known child sexual abuse material (CSAM) and surfacing likely novel or first-generation con...