As law enforcement and the FBI continue their search for Nancy Guthrie, trained negotiators are attempting to communicate with her captors to establish rapport and encourage a safe release. Forensic teams are also analyzing the digital ransom note that was sent to media outlets. Savannah Guthrie and her siblings have publicly urged their mother's captors to respond, saying that the family is listening and wants a peaceful resolution. Authorities say a delicate balance of communication and investigation is a standard approach in modern-day random notes. CBS News' Anna Schecter explains.