DNA Hair Test Hits a Dead End in Guthrie Disappearance

A hair found at Nancy Guthrie's Tucson home yielded no DNA profile, but investigators say the sample remains preserved and could still help; with the FBI, authorities sent it to a California lab as part of ongoing DNA analysis across multiple labs, including investigative genetic genealogy, as Guthrie's disappearance nears the six-month mark; a reward over $1.2 million remains, and tips are urged.