eX has a private section where we discuss possible botters/share suspect videos.

Here is the link to marc playing on the wolfenstein server:
[url]http://i286.photobucket.com/albums/ll115/ehlonofex/omgpwnd.jpg[/url]
This is from marcs xfire currently playing server.
Notice the SWAG-AimbotUSA tag.

Link to Aimbots.net forum post that lists this server as an aimbot server:
[url]http://aimbots.net/enemy-territory-cheats/8786-cheat-server-list-5.html[/url]
search for:
Server Name: ~~*=SWAG=*Aimbots USA (United States of America)
Server IP: 174.37.227.153:27960

Link to Swag420 forums where they discuss aimbot servers and nobot servers they run:
[url]http://www.swag420.com/viewforum.php?f=5[/url]
Specifically look for posts where peeps complain of aimbotters on the nobot servers.

Putting it together, Aimbots.net has many hax listed in the public section (no UT3 hax that I saw, however).  I don't know what is in the private section (or if they even have a private section, but most clans do). 

Marc is seen playing on a known hacking server.  

It's likely he would use hax in other games if he's known to use them in some games.  Or you can choose to believe the guy who says &quot;I cheat in other games but would never cheat in UT3&quot; to be telling the gods honest truth...