The Arizona police department is flying over the Tucson, Ariz., desert with a Bluetooth signal detector to detect a signal ...

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 ...

A device to detect emissions from Nancy Guthrie's pacemaker is among the tools investigators are using as their search for ...

Investigators are using signal sniffer to try to detect Nancy Guthrie's pacemaker.