(1) The file consists only of non-conviction data;(2) You are not under prosecution and you have not been arrested for or charged with a new crime; and either(3a) Two (2) years or longer has elapsed since the record became non-conviction data as result of the entry of a disposition favorable to you, or(3b) Three (3) years or longer have elapsed from the date of arrest or filing of charges and your are not a fugitive and the case is not still pending in court. 

Under a very narrow limited set of circumstances, at the Seattle Municipal Court, you can seek an expungement. Otherwise, one must seek a vacation of conviction. I think that post-conviction data can, and should, be removed.Updated