Is there a possibility your son could get involved with law enforcement in a positive way? (This depends a lot on your local police and how they view people with disabilities.) There is a program - not usually for kids with behavioral issues, so YMMV - called the Explorers, it's an offshoot of scouting: https://en.wikipedia.org/wiki/Law_Enforcement_Exploring
The reason I suggest this is that if he's a black-and-white thinker, he might benefit from learning about the law and how it works outside of the times when it applies to him - maybe if law enforcement doesn't work, you might find a lawyer who would be willing to let him learn?
When my son was smaller, he was fascinated by Batman and we found the following book - http://www.amazon.com/Batmans-Guide-Cri ... 0789497557 It's probably a little young for your son, especially if he is 2E, but I bet there are books like it for kids at different ages (maybe not with superheroes attached.) I do still recommend the book I mentioned earlier; the language is simplistic but it does frame things very well for a rules-bound, black-and-white thinker.
I hope all goes well for you, and do keep us posted on what decisions you've made and how things are working out.