Signal-sniffing Tech Expands Hunt for Nancy Guthrie

Investigators are using a Bluetooth Low Energy signal-sniffing device to track signals from Nancy Guthrie’s pacemaker in the ongoing search for the 84-year-old, with the unit mounted on a helicopter and potentially deployable on drones to widen the search radius beyond the device’s typical short range; the pacemaker pings every couple minutes, and while this tech can help triangulate a general area, expanding coverage will require more drones, operators, and infrastructure as the search enters its third week.