Go to the court where your case was dismissed...Go to the clerk and pay about 5 dollars and have them give you certified document showing the case was dismissed and the police report...I was in the same exact situation and i did get those papers...My advice to you though just expung your record..Many here will argue that expung doesnt matter when it comes to immigration..Thats a myth!!!!Based on my experience because i was told by an attorney to expung before applying..it matters alot especially when the case is dismissed...Once the case is dismissed, whatever you tell the IO is what they go by coz they cannot find the record that has been expunged and this is a fact proven beyond a reasonable doubt!! Dont hire an attorney to expung for you unless you want to waste your money..ist a straight forward process especially when the case is dismissed.....All this information comes from my first hand experience
DO: Irving, Texas
12/31/2000 LPR (EB)
02/03/2010 N-400 Mailed to TX
02/10/2010 N-400 recd @ Lockbox (Dallas, TX)
02/08/2010 PD (Originally 02/10 on NOA)
02/12/2010 Check cashed
02/20/2010 NOA
02/27/2010 RFE (basically finger print notice;;scheduled: 03/10/2010)
03/03/2010 FP done (walk in)
03/17/2010 Transferred to local office
03/27/2010 IL received, YL came one week later
04/23/2010 ID oath done same day-US Citizen