I am not a lawyer but have a good friend who is working on this very thing for me right now.
I had an assault charge that I was found not guilty in court of that I wanted off my record. If you were not guilty then you would have a shot. The clerk of court here in Va Beach told me that she has never seen the state deny expungment for someone who was not guilty. She said if you plead guilty or were found guilty, you will never get it off your record.