In less than five seconds, a person can tell if someone else is lying, by using these tips, according to Grazina Fechner, an Australian behavioral expert. She also shares a few tips on how to confront liars. Supremely confident people are often liars because they do it so much, they believe no one is catching on. But when they’re questioned, they become defensive and lose their confidence. Watch for eye movement changes, face touching, fidgeting and rising voice pitch to see if someone might be lying. Before accusing someone of lying, though, people should make sure they are in the appropriate environment, ask questions, have evidence and remain confident.