Thanks everyone for all the comments. They were very interesting and helpful.
Here's my question, though...if paddling is allowed by our school district and parental permission is not required (which is the case here), does it really matter if I expressly say, "I forbid you to paddle my child"? I mean, do they have to listen to that? Everything I've looked up seems to indicate that they don't have to pay any attention to that at all.
I'm just wondering because so many have said to say "my child is not to be paddled" or something similar, but I'm wondering if there's any reason they would have to follow my wishes in that regard. It doesn't seem like there is, which is very upsetting.
I've spent the last six years teaching my child that it is never ok for anyone to hurt someone....to hit or kick, etc...and here is a grown school official telling him just the opposite.