I was banned over and over due to (FairFight)"Not the cheat from here" I think they track how many kills per sec/min & stats as well. I was banned on WarZ for getting way to many kills and everyone of them was headshots...

This dude has some videos with FairFight killing him due to getting kill streaks.. (Some players have been banned for getting high kill streaks) I was testing this out sometime ago, and only using ESP I got kicked/banned from that server and others using the anti-cheat "FairFight" https://www.youtube.com/user/ytbalki/videos