You have gotten alot of good info in the previous posts. Doing your homework is an important first step. Second, is getting a good mental health professional to be in your corner so you can get a comprehensive evaluation. You'll want someone who is a licensed professional, who has significant experience working with adopted and foster children and who has specific training in treating children with attachment issues. One good source is
www.attach.org
A thorough assessment will include a screening for various issues such as mental health concerns (bipolar disorder, adhd (often misdiagnosed when there are other issues present and not adhd), etc). an assessment of attachment issues, a screening for FAS, Sensory-Integration disorders and a screening for consideration for neuro-psychological testing.
If you want to find out about effective treatments for children with RAD, I have several links on my website and the results of a research/followup study on what works and what does not work with children with that disorder.
Regards