Former FBI Agent Urges Rapid DNA Testing as Police Detain Multiple People in Guthrie Case

The quiet streets of Tucson were pierced by flashing blue lights on Friday night. It is the kind of scene neighbours remember long after the sirens fade. For investigators searching for 84-year-old Nancy Guthrie, it marked a decisive turn.

Three people were detained at a home just two miles from where Guthrie vanished. A fourth person of interest was stopped later in a restaurant car park. A grey Range Rover was towed away under police guard. Behind the spectacle, however, a far more urgent race is underway: DNA testing.

Ex-FBI agent says authorities need to beat time for a missing woman who depends on heart medication. However, authorities are saying little publicly. But former federal agents watching the operation unfold are already drawing conclusions about what comes next.

Why Rapid DNA Testing is Needed

Jason Pack, a retired FBI supervisory special agent with more than 20 years' experience, described the coordinated searches and detentions as the 'hallmarks of actionable intelligence.' In practical terms, he was explaining that police rarely deploy SWAT teams and federal warrants. Not unless they believe they are closing in on something concrete.

According to FOX News, Pack said investigators would now be fanning out across nearby streets. This means knocking on doors and gathering CCTV and Ring camera footage. The aim, he explained, is to reconstruct 'patterns of life' for those detained. Checking alibis against digital breadcrumbs such as doorbell cameras and phone data is important. It is slow, unglamorous work, but often decisive.

What makes this moment different is the evidence already recovered. Pack reported that DNA that does not belong to Guthrie or anyone close to her has been found at her property, alongside discarded gloves. But the Range Rover — covered before cameras could peer inside — may contain more.

In Pack's assessment, the case has entered what he called a 'significant escalation.' Meaning, laboratory turnaround times can matter as much as police boots on the ground.

Clock Ticks for Vulnerable Pensioner

Pack has been blunt about the stakes. Guthrie is elderly and without her heart medication. Every hour counts.

He criticised any delay in transporting biological evidence to a high-capacity forensic lab. Similar to FedEx, he said that waiting for routine commercial shipping could cost precious days. Drawing on past high-profile investigations, he noted that the FBI has previously used aircraft to fly evidence directly to its laboratory in Virginia. Therefore, eliminating weekend delays.

His message was simple: in a case involving a vulnerable woman, authorities should not be debating logistics. They should already know which lab is processing the samples, who is carrying them, and when results are expected.

The local sheriff, Chris Nanos, recently defended the decision to continue using a private Florida laboratory. This is over transferring everything to the FBI's main facility. He said federal partners agreed it was best to stick with the existing contract to avoid disruption.

Pack disagrees. He argues that once federal agents take the lead, the FBI's own lab becomes the logical destination. And it is simply because of scale, speed and experience with complex cases.

Behind the scenes, multiple teams are now working in parallel: detectives conducting interviews, analysts reviewing digital data, and forensic specialists preparing samples for testing. The detentions themselves do not guarantee charges.

They do, however, suggest that investigators believe they are close to answers. For Guthrie's family, the waiting is agonising.

The FBI has not confirmed where the newly collected evidence will be analysed or when it will arrive at a lab. Nor have officials said whether any of those detained are considered suspects.

What cannot be ignored is the urgency threaded through every expert assessment. DNA results could clarify who was present, when — and potentially where Guthrie was taken. And in a case like this, clarity and speed is everything.