I hope your meeting goes well Cola. I'll second blackcat's reply too.
One thing I'd do for sure is make sure you have the full info re what actually happened. In the instant that happened this week, did it happen when your ds was going to his regularly scheduled other-class-for-differentiation visit, or did he just wander out at a time when he wasn't expected to? That would make a huge difference in my perspective on how to proceed re this particular incident.
Overall, it sounds like you need to have an IEP (or 504) update meeting - I think he has an IEP or a 504? If not, it sounds like he needs one... at this school.
polarbear
