Can a pacemaker track you? Nancy Guthrie case highlights tech limits.

Information about Nancy Guthrie's pacemaker helped authorities piece together a new timeline in her kidnapping. Can the ...

Can Nancy Guthrie’s Pacemaker Offer Clues About Her Disappearance?

As the search for Savannah Guthrie's mother, Nancy, continues, a cardiologist explains how pacemakers work and if they can be ...

FBI Using High-Tech 'Signal Sniffer' in Nancy Guthrie Case to Detect Pacemaker — As the Search for NBC Host Savannah's Mom Enters Week Three

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.

Investigators hope to catch signals from Nancy Guthrie’s pacemaker

As the search for Nancy Guthrie continues, investigators are turning to a small device they hope could lead to a breakthrough: the 84-year-old’s pacemaker.