According to sources close to the investigation, there are concerns that DNA recovered from Nancy Guthrie's home may not yield a usable profile for comparison.

Add Yahoo as a preferred source to see more of our stories on Google. A family-owned DNA laboratory in South Florida has found itself at the center of a firestorm after being chosen by Arizona law ...

A forensic DNA expert believes the person who took Nancy Guthrie, the 84-year-old mother of Today show co-host Savannah ...

In an aerial view, Pima County sheriff’s officers gather on Nancy Guthrie’s property on Tuesday in Tucson, Ariz. | Brandon Bell, Getty Images via CNN TUCSON, Ariz. (CNN) — Only a few years ago, ...

APARTMENT WINDOW. POLICE HAVE NOT ANNOUNCED ANY ARRESTS. NEW TONIGHT THE REWARD FOR ANONYMOUS TIPS IN THE DISAPPEARANCE OF NANCY GUTHRIE JUMPS COMING FROM A DONOR HERE IN MILWAUKEE. >> A PROMINENT ...

Nancy Guthrie is believed to have been taken against her will from her Tucson, Ariz., home in the early morning hours of Feb. 1 Nancy Guthrie is believed to have been abducted from her Tucson, Ariz., ...

Forensic DNA analysis has fundamentally changed criminal investigations, providing an unprecedented level of accuracy in identifying suspects, exonerating the innocent, and solving cold cases. And ...

Only a few years ago, Tuesday’s announcement that a glove believed to be connected to the disappearance of Nancy Guthrie in Tucson, Arizona, had no match in a DNA database would have been a dead end.