Thoughts and prayers to you and yours. Have been through something similar, though not so threatening. As your wife undoubtedly knows, the state (Calif, probably others) goes to tremendous lengths to protect all the so-called "rights" of those in special ed programs. Seldom is the same attention paid to the "rights" of the others. Hang in there - use the other students as valuable resources. They will give you more info than police, etc. This obviously calls for expulsion, though special ed kids are judged on a different level. This kid is obviously crying out for help. I would demand to meet with school officials and teacher's union chiefs to get a clear position from them - and their plans to eliminate your worry.