COD2 - Serious Cheater Problem!

[DP23]

Hi Folks.

I got a Problem. We all got a problem.
I am damn pissed about the situation that is this:

SOMEHOW it is possible to Wallhack in COD2 XBL without any problems.
I don´t know why, I don´t know how but I know for sure that it is possible.

2 days ago I read something about this problem.
But I thought it was a hoax.
Today, I was playing Headquaters with a good friend of mine, I saw something echi. A Gun hanging out of a CLOSED Window.

Ah no prob, I thought. Bad clipping. THEN a guy moved out of the WALL next to the Window. Standing free in the air. Shooting at a guy, killing him, and then going back inside.

THEN he walked out of the house through the wall AGAIN and killed me!
I watched the replay and guess what. I saw nearly NO walls at all. Just frames and stuff. I watched this some time and the guy kept on doing shit.

I gave him a bad Rep and closed the Game.
Since then Im searching the Internet for this matter.

I want to know if it was just coincedence.
If anybody knows if this is possible please wright it down here.
(I mean not HOW to do it, I dont want to know this shit!)
Just IF it is possible on purpose.

THX

PEACE