Rules on putting a hand one children, eg putting hand out to stop them expiring doing something

[Whstaretheruies]

What are the rules on physically touching students eg a student I'd reaching for something and a hand is put one their arm tk stop them and then snatching things and pulling things from them... Escalating the situation.

It does heavily depend on context though. I kept having to take my hands out of a child's grip yesterday as he kept trying to suck on them! The rules don't cover every eventuality.