If you live in the states, look into a program in your area called "Project Lifesaver" the police put a tracking device on your child with severe autism so if he or she wanders off, they can find them quickly. It is a really cool looking kids watch in different colors. That is the other thing, I know of children that have in the blink of an eye wandered out of their house or even their school only to end in tragedy ... Project Lifesaver is a great program and free for people who have had problems with their child wandering out or even adults with dementia. You can find info it on the web.