The book, Tremors in the Blood: Murder, Obsession, and the Birth of The Lie Detector explores the history of the polygraph. We discuss that history with the author, Amit Katwala. Are the machines "truth serum" or "junk science"? Did the inventors stand by the reliability? How has the polygraph failed law enforcement and people accused of heinous crimes? Support our sponsor Regal Cinemas and Regal Unlimited. Sign up now in the Regal app or www.regmovies.com/unlimited and use our code IMPACTREG Impact of Influence is part of the Evergreen Podcasting Network Seton Tucker and Matt Harris began the Impact of Influence podcast shortly after the murders of Maggie and Paul Murdaugh. Now they cover true crime past and present from the southeast region of the U.S. Look for Impact of Influence on Facebook and please subscribe to the Impact Youtube Channel Learn more about your ad choices. Visit megaphone.fm/adchoices