"No he did not." People who specialize in lie detecting ALWAYS point toward "distancing" language, such as avoidance of contractions. "Did not" as opposed to "didn't" is exactly that, distancing. Also, people who are telling the truth when they are disputing an accusation show anger. They don't coolly say, "No I did not." Remember Bill Clinton's lies? "I did not have sex with that woman." Had he been innocent it would have sounded like this: "I didn't have sex with her! It's a lie!"<-- said in anger or disgust.&#65279;