Dude they most likely violated your privacy by an unwarranted search (I'm assuming it was unwarranted) if so they can get in alot of trouble and any thing they caught you with or suspect you of will be dropped. Unless you said yes to them searching you because that was your mistake. If they don't have a warrant you can ask for a warrant and if they don't have one don't let them search you. Did you get caught with anything? You could say the friends are lying and deny anything they accused you of. Violence won't solve anything just make you look like a dick and make the anger between you guys worse. What I would do is stop hanging out with them, ignore them, and tell your friends to avoid them for you as well. Pretty soon they'll feel like shit and will come back to you and then you can decide whether or not to hang around them. But I would definately not use any type of drug around them.