He's in eX?  Is it Bombachu?  Bombs is legit as far as I know.  The only way to tell if someone cheats anymore is if you get to know them as a person.  I talked to Kingtoot for three hours and felt like crap afterwards - cause I called him a hacker.  I play with Xmid in UT2K4, and if I didn't know him I might call him a hacker.  The dude hardly misses.  He's just that good.  

So if you suspect someone of hacking, try to get to know them (maybe use Ventrilo or something).  If they don't act right (guilty conscious) then maybe they're not legit.  And I usually suspect ass hole trolls to be hackers, more often that not.  If they're &quot;good&quot; and seem like their sole purpose is to piss you off, they're probably troll hackers.