As the hunt for Nancy Guthrie continues, several experts are weighing in on the importance of proof of life in her case. "Ransom is often not paid without proof of life because paying without verification risks funding a crime with no chance of recovery," Dan Donovan, the Founder and Managing Partner of Stratoscope Holdings, a security and risk management firm, exclusively tells Us Weekly. "Proof of life is critical: it confirms the victim is alive, validates that the communicators control the victim, and helps assess credibility and intent.