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Inventor Uses Signal Sniffer to Search for Missing Woman

2/18/2026

30 7 Full Breakdown

Summary

Story summary

Investigators searching for Nancy Guthrie, reported missing, are using a device called a "signal sniffer" to detect signals from her pacemaker.
David Kennedy, the signal sniffer's inventor and a former NSA hacker, spoke with CBS News about his collaboration with law enforcement in the ongoing search.
CBS News reports on the collaboration between Kennedy and law enforcement in the missing-person investigation.

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Story summary

Investigators searching for Nancy Guthrie, reported missing, are using a device called a "signal sniffer" to detect signals from her pacemaker.
David Kennedy, the signal sniffer's inventor and a former NSA hacker, spoke with CBS News about his collaboration with law enforcement in the ongoing search.
CBS News reports on the collaboration between Kennedy and law enforcement in the missing-person investigation.