Pehaps you can assist me with my reading comprehension then. You indicated that AIT would only be used for children under 12 at the request of parents. If that is the case, why would this not be included on the TSA website? Instead, there is a answer that AIT can be repeated instead of perhaps initiating a pat-down at first point of "failure" whatever that is.

What you are saying and the what the website is saying, while not explicitly contradictory, does not seem to be consistent.