The lying game

[The Liar]

Unfortunately, I have been unable to find a set of guidelines or rules to this game despite my attempts throughout the internet. The lying game, used as a basis for several media concepts such as "Cry_Wolf (Movie; 2005)" or "Doubt (Japanese animation; 2007)", is something that interests me very much. I, however, have not been able to re-create the game myself and thus need help.

Basically we chose the liar and begin the game and a few accusations are thrown back and forth but they are, for the most part, based off nothing. This is the only problem with the game, but it's also the most essential piece of the game and therefore I have come to these forums in hopes that someone may be willing to throw ideas back and forth with me until we find a legitimate way to determine suspects.

In my opinion two things need to be covered:
How to defend yourself after being accused and how to make an accusation based of body language, speech patterns, ect.
I feel if these two elements have some structure in each player, the game could be great, otherwise the game goes nowhere.