Took a look at the Nexon "careers" page

If you know where to look, catching hackers don't take long at all. The ones that are slippery (like those that constantly CC) are a tad harder to catch in the act, but we manage. And by providing evidence, it's generally easier and faster for the GMs to act on someone.

I highly doubt there are enough GMs to handle all of our reports though.

I remember making an interesting discovery from the cc hackers - whatever detection they were using reacted through invisibility. Which was obnoxious. Makes sense, though, since it's easy to tell when someone else enters a map - the mobs would drop aggro sometimes. My favorite patrolling grounds were Wolf Spiders and Birks/Dual Birks