Article continues below advertisementThe investigation into Nancy Guthrie's disappearance has so far resulted in no credible leads or suspects, causing critics to wonder if the officials overseeing the chilling case are qualified to handle the high-level job.As the search for the 84-year-old mother of Today star Savannah Guthrie enters its third month, an insider from the law enforcement community in Tucson, Ariz., made a surprising confession about the Pima County Sheriff's Department and mistakes they may have made during the early days of the investigation.