Search and rescue expert talks challenges in the manhunt for Brian Laundrie

Law enforcement agencies continue their search for Brian Laundrie, the fiancé of Gabby Petito and a person of interest in her disappearance, reports CBS News national correspondent Jericka Duncan. Authorities found Petito's body in Wyoming, and ruled her death a homicide. Chris Boyer, executive director of the National Association for Search and Rescue, joined CBSN to discuss the challenges in finding the 23-year-old man.