Pima County Sheriff Chris Nanos revealed that there are problems with the DNA evidence collected from Nancy Guthrie’s house that could take up to a year for the private Florida lab he’s using to resolve.

Pima County Sheriff Chris Nanos is detailing the latest challenge in the ongoing search for Savannah Guthrie’s missing mom, Nancy Guthrie. “Our lab tells us there’s challenges with it,” Nanos told NBC News correspondent Erin McLaughlin in a new sit-down interview on Friday,

A Q-tip, a tissue and a pizza crust

Authorities are warning volunteer search groups to stay off Nancy Guthrie's property and give investigators space after unauthorized searchers recovered a glove and backpack near her home.

Detectives are vetting nearly 20,000 tips as the search for 84-year-old Nancy Guthrie enters its third week in Tucson. $200,000 in total reward money is offered for her safe return, with new leads

The search for 84-year-old Nancy Guthrie began after she was abducted from her home near Tucson, Arizona, early on Sunday, Feb. 1, authorities said.

Two Tucson ex-cons face online scrutiny in Nancy Guthrie case despite no official accusations. Luke Daley detained in SWAT raid, released without charges.

Authorities are analyzing biological evidence in the search for Nancy Guthrie nearly three weeks after Savannah Guthrie's mom was last seen.