Those should be the only reasons, with or without, parental permission, unless it is written into BIP as a theuraputic method of de-escalation. For some kids, the hold is very useful in grounding them and calming them. For other kids, once you go hands on, the fight/flight response kicks in and it escalates them beyond calming. Anyone who has worked with the child should know which catagory he falls into. Of course, if he puts himself or other students in harms way then any child (SPED or not) can be restrained.