Investigation into Nancy Guthrie’s disappearance enters new phase

Authorities said the investigation into the disappearance of 84-year-old Nancy Guthrie, mother of "Today" show co-host Savannah Guthrie, is entering a new phase as DNA evidence yields no matches and ...

Have we leapt into commercial genetic testing without understanding it?

Daphne O. Martschenko and Sam Trejo both want to make the world a better, fairer, more equitable place. But they disagree on ...

Nancy Guthrie case may see resources scaled back as leads come up empty: Sources

Investigators looking into the kidnapping of Nancy Guthrie believe the case would soon have to move into a new phase with fewer dedicated resources, sources told ABC News.

Nancy Guthrie update: Why police may scale back the search for Savannah's missing mother

Nancy Guthrie's disappearance is approaching the point where big, round the clock deployments often become harder to sustain, ...

DNA from cigarette helps identify teenager’s killer nearly 44 years after her death

Over four decades after a teenager was murdered, DNA found on a discarded cigarette has helped authorities catch her killer. Sarah Geer, 13, was last seen leaving her friend’s house in Cloverdale, ...

This powerful forensic tool is cracking cold cases — but its price tag is often an obstacle

When a homicide detective in California’s Central Valley last year reopened the investigation into the unsolved killing of a bakery owner, she turned to an increasingly popular forensic tool credited ...