There is no way to determine if someone lies judging by the signs (or cues) of his/her body language.
So-called body language experts may theorize a lot about that, but in reality body language might only give indications that someone lies, not definite proof.
Also, many artists in the entertainment business can actually learn (with the help of their publicists) how to manipulate their body language so effectively that when they have to lie about certain things publicly then their body language does not exhibit at all signs that they lie.
This, of course, also happens in other fields, such as in politics where many politicians learn how to manipulate their body language so as to avoid giving body language signs when they lie (in interviews, speeches, etc).
There is also another thing: certain body language signs that indicate that someone lies can be very misleading.
For example, one of the most common signs of lying is the nose touch, but many people touch their noses when they actually tell the truth.
So-called body language experts may theorize a lot about that, but in reality body language might only give indications that someone lies, not definite proof.
Also, many artists in the entertainment business can actually learn (with the help of their publicists) how to manipulate their body language so effectively that when they have to lie about certain things publicly then their body language does not exhibit at all signs that they lie.
This, of course, also happens in other fields, such as in politics where many politicians learn how to manipulate their body language so as to avoid giving body language signs when they lie (in interviews, speeches, etc).
There is also another thing: certain body language signs that indicate that someone lies can be very misleading.
For example, one of the most common signs of lying is the nose touch, but many people touch their noses when they actually tell the truth.