If you haven’t watched this documentary, your should. It’s on Netflix, and it’s a great introduction into the field of behavioral economics, the science of lying, and the costs associated with lying and cheating.
It basically alternates between Dr. Dan Ariely and his co-researchers explaining what their experiments have shown, and people who’ve been caught lying or cheating telling their stories, including what was going through their minds when they were doing it.
It’s amazing to see how things like transactional distance make people more likely to cheat, but being reminded of an ethics system (even one from a religion you actively don’t believe in) makes people less likely to cheat.
Give it a watch some time.