I agree. If you see someone blantantly hacking, a 5 second demo of them locking onto someones head or something is pretty much all you need.

If you don't know how to record a demo, look around the forums. A few places explain it.

Everyone else, just freeze, mute, or give short bans.. Like Tentoes said, most of them won't bother coming back if they're in the server just to be a dick.

And lol Tentoes.. You used Minecraft lingo there... Griefers.. <.<..