The 84-year-old disappeared from her home just outside Tucson, Arizona , on February 1. No suspects have been arrested in her disappearance.

The Pima County Sheriff's Department could be facing legal action from a man they'd detained during the search for 84-year-old Nancy Guthrie.

Investigators are examining mixed DNA evidence from Nancy Guthrie's home. A hair sample recovered from the scene has yielded inconclusive forensic results. Multiple laboratories…