Guthrie Investigation Parallels

ABC News Crime and Terrorism Analyst Brad Garrett talks about how as the high stakes search for Nancy Guthrie hits day 11, parallels are being drawn between this investigation and the infamous 2001 disappearance of Chandra Levy, where her remains weren't discovered for over a year. The investigation into Guthrie’s abduction from her Tucson-area home at first seemed to progress with the release of that chilling Nest camera footage showing a masked, armed individual. While the video led to the brief detainment (but then release) of a person of interest, it has also triggered a tidal wave of public involvement. How are the Pima County Sheriff’s Department and FBI sorting through the thousands of tips flooding in via 1-800-CALL-FBI? How were investigators able to "excavate" data from Google's backend systems to find video Nancy Guthrie hadn't set up to be saved?