This guy at my school keeps touching young women inappropriately, and no one believes me or the girls. What should I do?

I am a student at a high school, and this other male student who I've known since the 3rd grade, started forcing himself upon girls shorter than him, and started touching them at lunch. He's done it to one girl around 5 times and has made her give him a damn handie, made another girl do it, grabbed one of my female best friends tits in the middle of the hallway, drugged at least two girls, and one girl, who as far as I know he hasn't touched, has claimed that he has full on raped a girl. To add on to the whole, "This guy is fucked up and needs to be locked up," he has threatened both my life, and the safety of the school. He has been reported multiple times, there has been restraining orders and lawsuits sent his way, and he has been instructed to stay outside of 5 feet from one of the girls, but breaks that often and no one does anything. Nothing has been done about him. I'm to the point now where I'm thinking "Swing first, worry about consequences later." Can someone please tell me what to do?