Regarding fighting in schools, it really depends on the school and on the environment in that school. I got into a lot of fights through middle school. By the time I got to high school, I had learned to avoid them for the most part, but it was an urban school and I was, as a Caucasian, a minority. We had gangs, bullies, drugs, and all that, and I ended up in a few fights that I couldn't avoid.
Fast forward, my oldest kids were at a school where fighting just isn't very common. There are bullies, but the environment is very different. They're both adults and out of the house now. My youngest is at a school, and it was hilarious. She told me there are only three bullies in her entire school, and everyone knows who they are. It really seems like social pressure is working well at that school to cause the bullies to be ostracized until they fix their behavior (as opposed to being emboldened by kids who are afraid of becoming victims of bullying themselves). Pretty cool, I think.
Point is, I wouldn't expect any of my kids to ever get into a fight around here at school. However, if they went to an urban, public school like the one I went to (and perhaps the one you're going to in PA), then maybe, yeah. But only if you can avoid it.
Regarding the law and all that, I think that involving the police in schools is not always the best policy.