Arizona sheriff blocking FBI from key evidence in escalating Guthrie case: source

TUCSON, Ariz. — A federal law enforcement source has confirmed to Fox News Digital that Pima County Sheriff Chris Nanos is blocking the FBI from obtaining key evidence in Nancy Guthrie’s disappearance. 

The evidence requested by the FBI includes a glove and DNA found inside Nancy Guthrie’s Tucson, Arizona, home, according to information first reported by Reuters. 

Federal officials have asked Nanos for the items so they could be processed at the FBI's national crime laboratory in Quantico, Virginia. However, Nanos has insisted on sending the evidence for testing at a private lab in Florida, according to the source. 

"It risks further slowing a case that grows more urgent by the minute," the official told Reuters, citing unspecified "earlier setbacks" in the investigation.

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The unnamed official also reportedly cite...