So from the CA forums, General Gay posted
Question:
When will you guys going to take a step to prevent people from modding the files on combat arms? (Example: Knife Modding) Isn't that against the terms of use? [somenoobF002]
Answer:
Yes, it is against the Terms of Use. Players found modding will be banned. We’re also looking at different ways of sealing the files from modders.
Nexon Forums - Responses to questions from the Community, April 15th