In 1973, a Stanford psychologist and seven others conducted an undercover sting to test the legitimacy of mental health diagnoses. The resulting scientific paper changed the course of modern psychiatry … but was any of it true? Author Susannah Cahalan joins host Krys Boyd to talk about her search for answers as she investigated the watershed study. Her new book is called “The Great Pretender: The Undercover Mission That Changed Our Understanding of Madness.”