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

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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 ...

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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 ...

The helicopter carrying the device is flying slowly and at a low altitude over the area where investigators are searching.

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.

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The FBI is deploying Bluetooth "signal sniffer" technology in a bid to detect the pacemaker of Savannah Guthrie's missing mother, Nancy, RadarOnline. com can reveal.