India, Feb. 14 -- The investigation into the disappearance of Nancy Guthrie has entered its 13th day now, with Pima County Sheriff Chris Nanos firmly rejecting suggestions of friction with the Federal Bureau of Investigation (FBI).

Nanos is also simultaneously defending his office's handling of evidence in the Nancy Guthrie kidnapping case.

In an interview with Fox's Matt Finn, the Pima County Sheriff addressed mounting speculation about the case, including reports of strained ties between his department and the FBI, the handling of forensic evidence, and claims that key items were missed at the crime scene.

Reuters released a report about a rift between Nanos and the FBI regarding the examination of evidence and releasing it to the FB...