Episode 618 of the popular radio program This American Life features the story of Doug Williams, the former police polygraphist who turned against polygraphy and in 1979 began providing the public with information and training on how to pass or beat a polygraph “test.” Over three decades later, Williams was targeted for prosecution in a federal investigation dubbed “Operation Lie Busters” and is now nearing the end of a two-year prison sentence. You can listen online or download the episode as an MP3 file here.