I'm writing an essay on why there should be trained and armed staff at colleges. Before I offer a solution or explain it, I first need to convince the audience that there is a problem. I think the best way to do that is to use hard evidence. So one of the most important things I'm looking for is statistics on how many instances of gun violence there are in school settings per year in America. That will help me to define the problem. But I also need to find statistics on gun crimes, gun crime prosecutions, and basically any other statistics that will help prove my point that further protection is needed against gun crimes. Where might I find stuff like that? I've already looked through stuff on AGS (Americans for Gun Safety) but I haven't found much more. Oh, and I know that gun violence occurs in schools much less than in other places; the angle I'm going for is that gun violence in schools is more prevalent TODAY than it has been in the past. I need a statistic to prove that.