QuoteJeffrey Nance, a former undercover cop and author of "Conquering Deception," which examines different ways of detecting lies in everyday life, prefers to bypass the question of scientific accuracy and just think of lie detectors as interrogation tools.
"I don't think there's a foolproof way to tell if a person is lying or not," Nance told Courttv.com. "There may be people who don't like me saying that but it's the truth."