Nancy Guthrie has been missing for 28 days and we're now learning that special agents from the FBI's Cellular Analysis Survey Team (CAST) are combing through data in an effort to try to identify pings and maybe be able to track the movement of the person or persons of interest that are responsible for whatever happened to Guthrie, 84, in the middle of the night on February 1.
“You have to know what normal is to find evil, and this person’s phone would be considered the evil," Heather Barnhart, an expert with Cellebrite and the SANS Institute who worked on the Kohberger case, told the Daily Mail.
"If you think about Bryan Kohberger, his device was turned off, so the tower right near King Road probably wouldn't have picked that up at all. But when he left, he turned it on, because most people rely on their phones for navigation," she continued, adding, "Unless these people (Nancy's abductor) knew exactly where they were going their phone will be off and then suddenly ping. So, not just cell towers right by Nancy's home, but take it a few miles out, spread out and look."
"If the person ever scoped out the house in advance, is there an unusual ping to towers? So, look at normal behavior. If we live in the same neighborhood, our phones are going to constantly ping that tower. Which ones are outliers?" Barnhart said.
In an interview with NBC News, Barnhart reiterated the importance of cellular data in cases like this."People forget how much their data spreads across devices. So the same thing that makes investigations hard make it hard for criminals to clean up," she said, adding, "Your phone is the silent witness to your life. It knows everything you do. So forming those patterns and then looking for any anomaly of someone trying to hide their digital footprint is key here.”
Authorities believe that Guthrie may have been abducted from her home. Despite receiving thousands of tips, neither the Pima County Sheriff's Department nor the FBI have identified a suspect or suspects.
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