I would strongly encourage you to visit the website for the Institute for Attachment and Child Development in Colorado (http://instituteforattachment.ong). Your son sounds exactly like my adopted son, who we got at age 12 and who suffers from reactive attachment disorder (RAD). ADHD and ODD are symptoms of this larger disorder for a lot of adopted kids, and unfortunately, standard treatments for ADHD and ODD don’t generally work very well. What does work is neurofeedback. Another problem associated with RAD is that most therapists have no clue what it is and can’t very well guide parents. IACD really gets it, has a unique treatment model, and has a wealth of information on their website that will help you be able to determine if that’s what you’re dealing with.
Good luck and know that you are doing an amazing job parenting your extremely difficult child!