DNA results on glove evidence could be pivotal in Nancy Guthrie case

TUCSON, Arizona — As Nancy Guthrie case As we enter the third week, investigators and the public await potentially significant DNA results tied to a glove found near the crime scene.

But according to retired FBI agent Jason PackEven a major advance in forensic science may not be the magic solution that many expect.

“From the perspective of an agent sitting in the war room waiting for lab results, DNA is one of the most powerful tools we have, but it is also one of the most misunderstood by the public,” Pack told Fox News Digital.

While investigators await DNA findings of a key piece of evidence, Pack said they are preparing for what he described as “three parallel realities.”

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If DNA matches Pack, a public figure, called it “obviously a significant investigative development” but cautioned against jumping to conclusions.

“One match does not automatically mean guilt,” he said. “That tells you that that person’s biological material came into contact with that element at some point. You still need to build the narrative around that. When? How? Is there an innocent explanation?”

He noted that any competent defense attorney would immediately review the chain of custody, potential contamination, and the possibility of secondary transfer.

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“So a match speeds up your investigation,” Pack explained. “It doesn’t turn off.”

Equally significant, he explained, could be a mismatch that means the DNA belongs to someone who is not currently on investigators’ radar.

“You’ve now identified a potentially unknown subject. You run it through CODIS, you look at familial DNA possibilities, you expand your universe of suspects,” Pack said.

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Police tape was put up around Nancy Guthrie’s Arizona home on Wednesday, February 4. Authorities say they are treating the home as a crime scene. (Fox News Channel)

Importantly, he noted that the development would not necessarily eliminate an existing research theory.

“This doesn’t mean your current theory is wrong. It means there’s a new subject you need to pull.”

The third possibility (inconclusive or low results) is often the most misunderstood outcome, Pack said.

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Environmental exposure, mixture profiles, the material of the glove and low copy number DNA can all complicate testing, he added.

“An inconclusive finding exonerates no one and incriminates no one,” Pack said. “It just means that a particular piece of evidence may not speak as loudly as you hope.”

Pack warned against letting a single piece of evidence influence public expectations.

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“I worked in research one piece of evidence “It has become a public obsession and has created tremendous pressure that does not serve the cause,” he said.

While a glove seized at or near the scene is important, such items can be temporary, he noted.

“Gloves are falling off, being thrown away, being thrown around,” Pack said. “The questions of when it was deposited and whether it is truly linked to the crime are as important as whose DNA is on it.”

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FBI agents search homes near Nancy Guthrie’s home in Tucson on Friday, Feb. 6, 2026. Guthrie was last seen Saturday night as the investigation into his disappearance continued. (Fox News Digital’s Kat Ramirez)

He added that experienced investigators never rely on a single forensic conclusion.

“DNA is one lane on a multi-lane highway,” Pack said, pointing to digital forensics, cell tower data, witness canvasses, financial records. surveillance footage and behavioral analysis as parallel avenues of research.

“The best cases are built on convergence, where multiple independent lines of evidence point in the same direction,” he said. “You never want to be in a position where your entire case goes up or down based on a single lab result.”

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An undated photo of Nancy Guthrie was provided by NBC in response to the disappearance of “Today” host Savannah Guthrie’s 84-year-old mother. (Courtesy NBC)

As expectations build around the pending DNA findings, Pack offered a final note of restraint.

“While these DNA results are the most anticipated development, they should not be seen as the most decisive development, regardless of what they show.”

Nancy Guthrie’s disappearance timeline:

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January 31, 2026

21:30-21:45 — Family drops Nancy home

21.50 — Garage door closes (according to authorities)

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February 1, 2026

1:47 — Doorbell camera disconnects

02:12 — Security camera detects motion

02:28 — Pacemaker disconnects from phone app

11:56 — Nancy’s family checks in on her after she missed her weekly church livestream meeting

12:03 — 911 was called

12:15 — Sheriff’s deputies arrive at the home

Stepheny Price covers crimes including missing persons, murders and immigration crime. Send story tips to stepheny.price@fox.com.