Penn & Teller: Bullshit Season 7 Episode 5 | Watch Penn & Teller: Bullshit Season 7 Episode 5

Penn & Teller: Bullshit Season 7 Episode 5 air on Thursday July 23rd, 2009 10:00 PM Via Sho.Penn & Teller: Bullshit Season 7 Episode 5 with title ” Lie Detectors ” in this episode 5 Polygraphs are used in thousands of investigations and job screenings, but can a machine really detect whether someone is lying? Penn and Teller meet people whose lives were ruined by faulty lie-detector results.