An expert tells PEOPLE why pacemakers have Bluetooth technology, and how it can help locate Savannah Guthrie’s missing mother ...

The “ethical hacker” who created the Bluetooth “signal sniffer” being used to try and track Nancy Guthrie’s pacemaker said he created the high-tech tool specifically for the search to find the missing ...

They’re searching for Nancy Guthrie’s heartbeat. Cops are flying over the Tucson desert with a high-tech Bluetooth signal detector, also known as a signal sniffer, in an attempt to locate a signal ...

As the search for Savannah Guthrie's mother, Nancy, continues, a cardiologist explains how pacemakers work and if they can be ...

The "signal sniffer" being used in the Nancy Guthrie investigation was mounted on a helicopter on Monday.

The FBI is using "sophisticated" technology to try to locate Nancy Guthrie's pacemaker, as the search for the mother of US TV ...

Trump Blasts Leak of Pacemaker Tracking Tactic ...

A “signal sniffer” is not a GPS tracker — it is a radio-frequency detection tool. While pacemakers are not designed to reveal a person’s location, investigators appear to be exploring whether any ...

Information about Nancy Guthrie's pacemaker helped authorities piece together a new timeline in her kidnapping. Can the devices track you?

As the search for Nancy Guthrie continues, investigators are turning to a small device they hope could lead to a breakthrough: the 84-year-old’s pacemaker.

Nancy Guthrie's kidnapping case has been going on for a while now. Her address search spiked on the internet before her ...