The FBI has employed advanced bluetooth technology, specifically 'signal sniffers', to locate missing person Nancy Guthrie's pacemaker as the search enters its third week. The pacemaker, which emits signals, could provide crucial information about her whereabouts. Investigators have been using helicopters to scan the Tucson desert in Arizona, aiming to detect any signals from the device implanted in her chest.

As the search efforts continue, experts highlight the potential of pacemakers to assist in locating individuals, although there are limitations to this technology. Various US media outlets have reported on the investigative efforts, emphasizing both the hope and challenges involved. This search not only raises questions about the efficacy of modern technology in missing persons cases but also reflects the desperate but determined efforts of law enforcement in finding Ms Guthrie.

The case has garnered significant media attention and involved Nancy's daughter, Savannah Guthrie, who is an anchor for the US Today show, further spotlighting the family's distress and urgency in the search. The community and authorities remain hopeful that this technology can yield successful results, demonstrating how law enforcement agencies are adapting to incorporate new technologies in their operations.