Lying is a widespread phenomenon which we all do to some extent. If you are working with others, it is often very useful to be able to spot the fibs.
Remember in all this that one indicator is seldom enough. You should watch both for clusters of behaviours and synchronisation of behaviours with what is being said.
Also, remember that a lot of the body language associated with lying is the same as that which indicates stress. People feel stressed for a range of reasons, not just because they fear being found out when they lie.