In this article
The NIST review of DNA mixtures examines both interpretation reliability and sample relevance. Distinguishing contributors and evaluating very small quantities can require complex analysis. [1]
The agency’s explainer describes secondary transfer: genetic material can reach an object through intermediate contacts. The presence of DNA and the activity that deposited it are therefore different questions. [2]
We suggest three questions when reading DNA news: what result did the laboratory obtain, which hypotheses were compared, and what does the report say about how and when the material was deposited? A headline may hide these questions behind the word “match”.
This article revisits existing methodological documents. It does not announce a new technique or evaluate an actual sample. It offers a reading framework for future criminal-investigation coverage.
