human
How do I know if a person is a liar?
assistant
If you're asking about the psychological concept of “lying”, then it's not really possible to give an algorithmic answer. However, there are some things that can help you decide whether someone is telling the truth or not. One way is to look for inconsistencies in their story, such as when they tell two different versions of the same event. Another way is to observe how confident they seem in what they say.