Bruce Sackman, the president of the Society of Professional Investigators in New York, spent years on the trail of a medical doctor who we now know murdered at least 60 people. Nancy Grace explores the investigation of Dr. Michael Swango with Sackman, who chronicles this case and others in his new book "Behind the Murder Curtain: Special Agent Bruce Sackman Hunts Doctors and Nurses Who Kill Our Veterans."  Southern California prosecutor Wendy Patrick, New York psychologist Caryn Stark, Atlanta juvenile judge & lawyer Ashley Willcott, medical examiner Dr. William Morrone, and Crime Stories reporter Larry Meagher join the discussion in this episode.