Freelance journalist Philip Eil talks with Erin about his debut book, "Prescription for Pain: How A Once Promising Doctor Became the 'Pill Mill Killer.'" During their conversation, Eil discusses his years-long investigation into his father’s old classmate, Paul Volkman, a man who once seemed destined for greatness, but is now serving four consecutive life sentences at a federal prison for his involvement in a massive “pill mill” scheme in southern Ohio.