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Inventor of "signal sniffer" discusses its use in the Nancy Guthrie search
Posted
February 18, 2026
Views
141,760
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February 18, 2026
141,760
220
100
0.23%
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5:33Now PlayingInvestigators in Nancy Guthrie's disappearance are using a device called a "signal sniffer" to try to detect transmissions from her pacemaker. David Kennedy, former NSA hacker and inventor of the pacemaker signal detector, joins CBS News to discuss his work with law enforcement in the search.
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