Joe, I doubt this will do you any good, but I'll give it a try:
When I taught Christian school, we would have an occasional student who excelled at being a fighting liar. With 100% back-up from the parents, the student achieved status, admiration, respect, etc., from other students for his success as a liar. Seeing how successful the student was, we would sometimes have another student decide to become a liar in order to achieve the same status (which is very important to teen-agers.)
The student didn't really want to be a liar--it was the status the student wanted. I explained this more than once at faculty discussions, and strongly believed that we should simply tell this to the parents in front of the student. Leadership agreed with me, but feared the revenge of the parents.
One day, a student who was knew at it tried it, and the parents went directly to me, so I decided to give it a shot...