In a game I was behind YubNub, He was on the enemy team. I had a knife and was closing fast on him, when I watched him shoot through a wall to kill another player on my team. I have reported this guy many times and it seems, Activision has done nothing about it. Everyone knows he hacks and uses game exploits, others have reported him as well. So, Activision what is your excuse to not enforce you own policies.?