After you receive the arrest record: First, go back to the county clerk and ask for a certificate stating that there is no record of disposition. The clerk will not want to do that, but you have to convince her to help you, pretty please. Bring with you the Request for Evidence letter that USCIS sent you, and the arrest record. Second, go to the District Attorney's office and ask for a letter stating that no charges were brought against you. Again, they do not have to give it to you, so you will have to ask for help. If you do not get these two papers, you will have to retain an attorney to do it for you. Retaining an attorney would be a good idea, anyway, because you do not want the USCIS to see your arrest record (which will likely result in denial of your application and, possibly, in your being placed in removal proceedings).
Answered on Dec 19th, 2012 at 2:21 PM