Five down in Apartment 307: Mass fentanyl deaths test a Colorado prosecutor

Murder, an accident or something in between? Fentanyl, a powerful and addictive opioid, has resulted in the most lethal narcotics crisis in U.S. history. Sari Horowitz, Meryl Kornfield, Nick Miroff and Steven Rich report on the mass poisonings resulting in hundreds of thousands of deaths in a year.