kiri the problem with saying that they will be denied is you can't catch someone who is good at hideing there tracks say useing proxy servers and what not. plus large time lapses between murders. too many things there. one person could easily kill someone 5 times with different char and get away with it. though i study networking so i might know how to do that better then some i guess, but still.
BTW what Taiko said is an answer as long as the clan helps you i played a char i was bad with but the clan grew me up to hero+ within a few days of gameplay. If you are in a good experianced clan they should be able to help you.