Investigators are using a tracking device called a "signal sniffer" that can detect signals emitted from electronic devices as the search for Nancy Guthrie continues in its third week. David Kennedy, ...

Add Yahoo as a preferred source to see more of our stories on Google. Investigators in Nancy Guthrie's disappearance are using a device called a "signal sniffer" to try to detect transmissions from ...

TUCSON, Ariz. (13 News) - As the disappearance of Nancy Guthrie enters its third week, the FBI is using new technology that could help locate her using signals from her pacemaker. Law enforcement is ...

TUCSON, Ariz. (KOLD/Gray News) - As the search for 84-year-old Nancy Guthrie enters its third week, the FBI is employing new technology that could help locate her using signals from her pacemaker. Law ...