India, June 4 -- Amid the search for Nancy Guthrie, a former Modesto Police Department detective turned law enforcement consultant has said that tracking could lead to a "big break." Jon Buehler said in a conversation with NewsNation's Brian Entin that tracking cars in the area of Nancy's home, through surveillance cameras or GPS data, may expose a possible suspect.

Buehler also suggested checking if anyone ever searched for Nancy's address on Google.

"If somebody ever plugged her address into a Google search for a Google Maps or whatever, if they did a reverse keyword search on that because those records are maintained for a period of time, to see any random person that would have typed in her address that had a reason to do it and the...