With the search for Savannah Guthrie‘s mom, Nancy, entering its third week, the Pima County Sheriff’s Office announced on Monday, February 16 that her children and “all siblings and spouses have been cleared as possible suspects.” Now, experts are shedding light as to how they came to that conclusion.

Speaking to Page Six, former CIA and FBI special agent Tracy Walder revealed that there are many methods authorities likely used to clear the family.

“Authorities have been able to alibi all of them and account for their whereabouts on that evening,” Walder explained to the outlet for a story published on Monday, February 16. “They look at their cell phone data and figure out if it matches up to where they were. They also use license plate scanners to see if they’re driving at the time and if they’re caught on cameras.”

A second expert, retired FBI agent Jason Pack, told Page Six that the Pima County Sheriff’s Office can likely feel very confident in their decision to clear the family, given all the investigative methods that were at their disposal.

“It seems like they are confident in their work … alibis, phone records, financials, digital forensics and the evidence has told them what they need to know,” Pack explained.

Pack added that Sheriff Chris Nanos “seems to feel a real obligation to step in. He’s running a case and he’s trying to stop additional harm to victim families.”

The announcement put an end to a lot of online speculation. As In Touch previously reported, the Sheriff’s Department previously pushed back on a report that Tommaso Cioni — who is married to Nancy’s daughter, Annie — was somehow responsible.