Most people would consider this method unacceptable to be used on hardened criminals, so who in their right mind could approve these methods be used against children?
The worst part of it is if even this method is said to be used only in instances when the child is "a danger to themselves or others" how can we really place our faith in the staff members to determine when restraint should and should not be used? I know my mother overestimated the ethics of the staff in the program I was in, and based on the administrating staff's prior history and the track record of the school and related industry I'd put good money on the chance that these methods are used way too often and in ways that can only constitute child abuse.
If I were a parent, aside from just pulling my kid as quick as I could I would DEMAND that a video monitoring system be set up and broadcast for parents to access at anytime. If Ken didn't have anything to hide then why would he refuse this request?