The search for Nancy Guthrie has been under way for over a month, but there is still no clear progress as to the 84-year-old woman's whereabouts. The case has taken a more complex dimension as federal investigators examine the high-tech methods that may have been used to facilitate her disappearance.
Evidence now points to the possible use of advanced equipment to disable surveillance and communications during the abduction. The lack of digital footprints in a modern, surveilled neighbourhood has suggested a level of premeditation that has unsettled the Tucson community.
