He made it all the way to the parking lot this time. A guidance counselor, arriving late for work, caught him and escorted him back to his class. The para doesn't come until 9, so she wasn't there yet. No one seems able to tell me what happened. In fact, I wasn't told until 3pm (I got the call just as we were arriving for Andy's therapy).
The IEP meeting is scheduled for 9:30am on Thursday. Seriously considering keeping him home until then, for his safety.