I have a pretty good idea who has been committing credit card fraud against me, I also have proof of the perpetrator doing it to someone else. In the case of the other person, I have a letter from a collection agency addressed to the perpetrator's address, in the name of the other victim. Is this good evidence against them? If not, what other forms of evidence do I need for the investigation process? I also would like to know the process of prosecuting a fraud committer, from anyone that has experienced it.