If you were falsely arrested, even if you were not charged you need to do everything that you can to remove it from your record. Retaining a criminal record expungement attorney in Sacramento like Michael Chastaine is a step in the right direction.
There are a couple of things that one can do if falsely arrested. You can move the court for a determination of factual innocence. While the burden on you is fairly high, I have found that sometimes you can get the District Attorney to agree to such a finding. If the Court makes a factual innocence finding, the record of arrest must be removed from your record completely.