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When state health officials were sued last year for storing infant blood samples without parental consent, they said it was for medical research into birth defects, childhood cancer and environmental toxins. They never said they were turning over hundreds of dried blood samples to the federal government to help build a vast DNA database — a forensics tool designed to identify missing persons and crack cold cases.

A Texas Tribune review of nine years' worth of e-mails and internal documents on the Department of State Health Services’ newborn blood screening program reveals the transfer of hundreds of infant blood spots to an Armed Forces lab to build a national and, someday, international mitochondrial DNA (mtDNA) registry. The records, released after the state agreed in December to destroy more than 5 million infant blood spots, also show an effort to limit the public’s knowledge of aspects of the newborn blood program, and to manage the debate around it. But the plaintiffs who filed the lawsuit never saw them, because the state settled the case so quickly that it never reached the...