Basically all kinds of things can indicate stress factors. Stress <i>can</i> indicate lying, but it can also indicate a whole host of other things such as someone getting frustrated about the entire situation, or worried that you seem to think they might be lying...<p>You can spot liars based on body language, but then you first need to <i>know</i> how that specific person reacts in normal situations vs. when they&#x27;re lying.