ADELAIDE, April 20 - Voller has been giving evidence to the royal commission into the Northern Territory's juvenile justice system, and was responding to claims from the principal of an Alice Springs primary school he attended.

He says it's possible he could have broken a window with his shoe and tied socks around his neck during sessions in a 'time out' room at the school, in which he once defecated when he was not allowed to go to the toilet.