TUCSON, Ariz. — Investigators couldn't obtain a DNA profile from a hair sample recovered inside Nancy Guthrie’s home, Pima County Sheriff Chris Nanos told Fox News Digital in a new interview Thursday as the case nears its six-month mark. Working with the FBI, investigators sent the sample to a California laboratory for additional DNA testing. NANCY GUTHRIE'S SUSPECTED ABDUCTION: TIMELINE OF EVENTS IN DISAPPEARANCE OF 'TODAY' HOST'S MOM"It came back ... there's no DNA," Nanos said. "There's other things that hair may prove valuable for, but right now it was just about, 'Is there any DNA there?' "We believe, just as the family does, just as Savannah does, somebody knows something.