Habitual Liars - how do you deal with them?

Well, his father and I have always tried to make conversation with him to get him to open up and he used to unfortunately because of his repeated lying it is and always has been difficult to truly determine when or if he is telling the truth. We have done a lot with him and for him but despite all our many attempts this child is still lying, hateful, disrespectful, spiteful. Oh and the spitefullness is unreal. He chooses to refuse food and then turns around and makes complaints at his school, stating that we are not feeding him and then we in turn have Child Protective Services and an in-home service coming to our door daily to make a determination of us and his nutrition, etc. They have determined that he refuses foods if it isn't something he likes or wants and that he isn't neglected or abused but yet they are still coming to our home and still getting the same complaints repeatedly. His father and I have had disagreements with these social workers about what they are wanting to try as we have already tried all of the same things many times over and nothing has worked. They demand we try them again so that they can have documentation. We asked them last night why they feel the need to reward a child with a privilege for doing 1 good thing but 3 bad things. He lied twice to the case workers face and then also called me a B**** plus is already missing class assignments in 1 of his classes but has descent grades in the rest. Tell me where this is a good reason for rewarding. In our opinion you are showing the child that it is ok to do wrong and he will still be rewarded because he did 1 thing right. I just don't understand the system and what they think they are doing.

He has always been told that there are less ramifications if he tells the truth up front rather than to lie about it repeatedly and then finally admit the truth. He has never been physically or verbally abused so I don't know where a fear would have or could have come into play in this situation. His mother is very much like this but I have never heard of such a thing being inherited. It is a bad situation and one that we have been trying to conquer on our own up until the last several months when we began taking him to therapists to try and get to the bottom of the whole thing.

We have been trying to get to the root of the problem for some time now with no luck. He has been seeing therapists to try and help get into his head and see what is going on but so far we have gone through 2 therapists and are now on our 3rd one and hoping for some good luck with this one as this therapist is a man and the last 2 have been women. One of the biggest issues we have is with the fact that his mother walked out on him when he was less than 2 years old and has had very little contact with him ever since. I personally think that this is a big part of his problem but unfortunately he isn't willing to let anyone get close enough to him to get into his head and he tends to use and manipulate women. I know this for a fact as it is exactly what he did to me when I first met him. Fingers crossed that this new therapist will be able to get to the root of his problems.