|Style over substance|
Lie detection is the ability to tell when a person's lying based on an idea of the principle of the lie. There are many different theories for how to detect lies that date back to at least ancient China and probably before. The most common way is the polygraph, which looks for changes in pulse and other bodily signals.
 Other "ways" to detect lying
- Their pupils will dilate
- They stop salivating
- They look to the right
- They look to the left
- They become fidgety
- They become unpleasant
- They fail to make eye contact
- Their voice rises in pitch
- They pause before speaking
The problem with most of these is that they are based on body reactions which can be controlled by a liar, or uncontrollable by someone telling the truth.
 Ways which might actually work
- If they are inconsistent
- If they lack detail, and object to being asked for more
- If they have more detail than they should remember or recall given the circumstances (a person being able to remember exactly what they did during a crime, down to how many steps they took during their alibi.)
- If they say "I don't remember" or "I don't recall"