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

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

Authorities are attempting to use the device to detect the signal on Nancy's pacemaker over two weeks after she was reported ...

Investigators in Nancy Guthrie's disappearance are using a device called a "signal sniffer" to try to detect transmissions ...

Law enforcement is working with a device known as a “signal sniffer” that uses an amplifier to find Bluetooth signals and identify the unique MAC [Media Access Control] address of Guthrie’s pacemaker ...

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

A device that can pick up certain electronic signals is being used in the search for Nancy Guthrie, as it may detect emissions from her pacemaker, sources told CBS News.

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 ...

The device is attached to low-flying aircraft to identify Bluetooth signals, like those emitted from pacemakers.

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Guthrie has been missing for nearly three weeks after disappearing from her home in Tucson, Arizona on February 1. Law ...