Pima County sheriff warns in NBC interview DNA tech issues in Nancy Guthrie case may take ‘months’ to resolve

TUCSON, Ariz. — Investigators in the Nancy Guthrie missing persons case are not looking into any new names, Pima County Sheriff Chris Nanos said, amid challenges with mixed DNA found at the 84-year-old's Arizona home at the lab his agency is using. 

"In terms of leads and working and getting out there, I think that's still growing, yeah," Nanos said of the investigation during an interview with "NBC Nightly News" that aired Saturday. 

The sheriff's remarks ran counter to statements...