NIST researcher describes ‘‘congruent matching’’ method, reports near‑zero error rates in ballistics tests Dr. Song of NIST presented a method called congruent matching for forensic image correlation and reported validation experiments (including 95 cartridge cases and 4,465 image pairs) he says yield cumulative false positive and false negative error rates of less than 1 in 1,000,000. He described workflows for cartridge-case, firing-pin and bullet‑profile comparisons and said the approach could support federal ballistic identification efforts.

Dr. Song's groundbreaking "congruent matching" method promises to revolutionize forensic ballistics with an astonishing error rate of less than 1 in 1,000,000!

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