Is within a agreed disorder where on earth a character cannot bring up to date a precise flop?

If there is such a disorder -- an out of control urge to speak the truth -- does it have a mark? I'd like to research this topic further, but requirement a starting place..Is within a agreed disorder where on earth a character cannot bring up to date a precise flop?
Some autistics can't lie. http://www.autism.org/lying.html...
Or, others throw out to deliberatly lie. However, some autistic children can sprawl.
You must have watch "Liar Liar" last hours of darkness!! Same hear, I've seen it back, one of Jim Carey's better movies.