I see your point since that's how most societies works. But ofcourse since I saw it with my own eyes I know he cheated, Like seeing someone kill a guy. If I saw it I know he did it, I don't need a jury to tell me he did. But I see you point since you where'nt there with me.
So to the point. I need to record a game with him where he does it and then what? Send it to whom?
I don't know, I've never accused anyone of being a cheater on the PS3. Not on modern warfare 2, not on black ops, not on crysis, even though people claim to have seen a lot of them. But try that link that Animoe posted? Tell them you have a video (if you have one). Then they will probably contact you further.
I too am against cheaters, but It's just normal to not call them a cheater unless it's proven. It's the same way in court.