Article continues below advertisementAs the investigation into Nancy Guthrie's disappearance stretches into its third week, authorities are hopeful that her pacemaker may provide critical information regarding her whereabouts. The Pima County Sheriff's Department announced on February 17 that they are utilizing advanced technology to locate the beloved mother of Savannah Guthrie.Article continues below advertisementSource: @savannahguthrie/InstagramNancy Guthrie has been missing for nearly three weeks.