on the interview letter it will tell you what documents you will need as an update which would be the I-864 they didn't have the police letter highlighted but i had my husband get one anyway before we knew about what they would request. I had to send my 1040 and tax update information with an updated letter from work. ok i just pulled up my letter so they didn't ask me for an updated I864 but I did one anyway with my new income. Do you have the letter yet or you just wanted to know? looking at my letter they didn't ask for the police cert