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Researcher reports low false‑positive rates for duct‑tape fracture matches, but manipulation raises false negatives
Summary
At a symposium, Dr. Tatiana Trejos presented a laboratory study of duct‑tape fracture matches showing very low false‑positive rates in controlled samples and about 98% true‑positive performance, but she reported false‑negative rates can rise to roughly 64% after extreme physical manipulation; she called for interlaboratory collaboration to validate scoring thresholds.
Dr. Tatiana Trejos presented results at the symposium from a laboratory study that evaluated error rates in fracture‑match examinations of duct tape and proposed a discrete, scrim‑area scoring method intended to improve consistency among examiners.
Trejos, the study’s lead presenter, said forensic tape comparisons commonly support criminal and national‑security investigations, but that ‘‘there are no standardized criteria to arrive to a conclusion of a fracture match,’’ which leaves determinations dependent on examiner judgment. The project’s goal, she said, is to develop standardized match/nonmatch thresholds and measure their accuracy.
The study began with one roll of tape cut into 250 samples (about half hand‑torn and half scissor‑cut). The team generated random pairings and ran roughly 2,000 comparison tasks across training and test sets. Trejos described a blinding procedure in which an analyst unassociated with the examinations…
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