Video in investigation into Nancy Guthrie's abduction raises questions about surveillance technology

Tuesday’s release of video surveillance footage showing an armed, masked person at Nancy Guthrie’s doorstep on the night she was abducted has raised a host of questions about why it took so long to publicly release, how it was retrieved and what it means for privacy. The process involved days of searching, the FBI said, after law enforcement initially believed the footage was lost because the camera was disconnected and Guthrie didn't have a subscription to the camera company. The surprising emergence of the video footage has resurrected questions about digital content's long afterlife, as billions of people increasingly entwine their lives with mishmash of internet-connected devices, making it possible to retrieve snapshots from their past like old photos stored in an attic.