Y'all, this is soooooo disappointing to hear! Into the fourth week of the search for Nancy Guthrie, we've all been holding our breaths, hoping that key DNA evidence discovered inside her home, which does not belong to her family members and others in her close circle, could be the key to solving this mystery. Unfortunately, we're gonna have to wait longer for answers. Related: Searches For Nancy's Address Spiked Before Abduction! In a candid interview with NBC News on Saturday, Pima County Sheriff Chris Nanos revealed there have been "challenges" with the DNA sample.