I tell you what, I don't have kids now but if I did and a someone other than myself or their father paddled them I would have a Major problem with that. In my eyes a teacher should call the parents, make them aware of the problem & let them handle it how ever they choose to.
Out of curiosity why?
I feel that its the parents job to teach their kid right from wrong. And if the child does something wrong its the parents job to correct it. You don't really know your child's teacher all that great, so its like letting a stranger pop your kid. That just the way I see it.