Fox News chief correspondent Jonathan Hunt reports live from Tucson, Ariz., on the search for Nancy Guthrie, detailing new physical evidence and a broad request for surveillance footage on 'Special Report.'

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 inNancy 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 theFBI's national crime laboratoryin 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.

NANCY GUTHRIE CASE: ALL OF THE PROPERTIES SEARCHED BY AUTHORITIES SINCE DISAPPEARANCE

Savannah Guthrie and her mother Nancy Guthrie are pictured in 2023.(Nathan Congleton/NBC via Getty Images)

The unnamed official also reportedly cited "earlier setbacks" in the investigation and criticized Nanos for not requesting FBI assistance in the investigation into Nancy Guthrie’s disappearance sooner.

ThePima County Sheriff’s Officeis the primary investigative agency in the search for Nancy Guthrie, with the FBI only permitted to take part if requested by local officials.

The official added that Pima County has spent roughly $200,000 on sending evidence to the private lab in Florida, with which the department contracts.

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