Please post this in the Special Needs Forum. There are people there who have children who are diagnosed psychopaths. They should be able to help you get the resources your family needs. Plus it is a very active board, unlike this one. My son has RAD but "mild" (among his many other diagnoses). These members have helped my family and him. The ATN (Attachment Trauma network) has a forum called Little Zebras that should be helpful to you as well - it is a list serve that is by invitation only for severe children. I'm sure someone can get you a link for that group. I don't have it here with me.
PLEASE post this to the Special Needs Forum.
http://forums.adoption.com/special-needs-adoption/
Mary