Well said Yann, our justice system is based on the U.K. model so things are about the same here too.
Part of why I like Aikido for self defence as well is that I have the choice to also control conflict without striking the opponent unless I absolutely have to, by exploiting other things like kuzushi etc.
In my situation the guy and his pals were positively shocked when I did not try to hit them, but went for taking the guy towards the ground with a wrist lock. I was happy I did not have to hit him as well, it's harder to deny bruises in court, even if they attacked first.
Ignacio, I'm working on getting some info you can see, else I'll have to scan something from "Aikido: Tradition and the Competitive Edge." Though I'm sure it's nothing anyone hasn't seen before.
Great posts all.