I was banned on the WBKS server network on BF3 two days ago for suspected cheating. The ban was enforced on the Operation Metro/no explosives server and it is my understanding it was carried out by a script. After checking myself with a cheat-o-meter, I've come to the conclusion that it was triggered by the HS/K ratio I have. I can ensure you I don't hack, and while my HS/K might be just over average, my accuracy is terrible.

