Authorities in Arizona are investigating reports of ransom notes as their search for Nancy Guthrie, the mother of “Today” show anchor Savannah Guthrie, enters its fourth day. Retired New York City police officer Joe Cardinale tells “Morning in America” that when a ransom note is received, investigators must first establish proof of life. He says authorities should check anyone who has been to Guthrie's home — including caregivers, delivery drivers and even family members — as they're familiar wi