Ya, RAD can do that to you. But undiagnosed ADHD will also have the same symptoms and ADHD is treatable. Of course, he easily could have both. Does he have the same problems in school?
You might want to take a look at this link on ADHD and see if any of these also fit. http://www.help4adhd.org/en/about/what/WWK1
If you think that ADHD or ADD might be a possibility - I am also the CL here -
http://www.medhelp.org/forums/ADD---ADHD/show/175 - post me there if you have any questions about the ADHD link.