@ZulkiersOr...
Re-hire some Q/A personnel and have them do the following. If a player has a win rate over 20%, automatic hand audit including scrutiny of other stats and at least one guaranteed match being observed. If a player has a k/d over, say, 2.0 then same. If a player has any weapon with accuracy above ALGS averages then same. If a player has accuracy numbers that are consistently above average ACROSS ALL WEAPONS USED then same. Oh, and either ban all PC players or at least exclude them from console lobbies.