Article continues below advertisementDave Smith, a former lieutenant with the Arizona Department of Public Safety, says he still believes it is a strong possibility that Nancy Guthrie, the missing 84-year-old mother of Today show co-host Savannah Guthrie, was taken to Mexico after her abduction from her Tucson home on February 1.He points out that Nancy's Catalina Foothills neighborhood is only about 60 miles from the border town of Nogales. He notes that while Nogales, Ariz.