The link below is a query on the SROWA catalogue searching for "conditional", "ticket", "expiree" or "convict" in Series S122 which are WA Supreme Court Indictments. The results will include those who were "not guilty". You can modify the search to add in your person of interest's surname. If you find any interesting cases you then need to order the documents to be retrieved so that you can view them in the SROWA Research Room at SLWA. They are still adding records after 1885.
You need to scroll down to see the cases or else click on "Advanced Seach options" to hide the search details. Currently you should see 866 results with 231 of those "not guilty". Some cases involve more than one convict.
The convict index below is a work in progress. We are adding convicts that we know were sentenced in the Supreme Court and a few that we know were acquitted. Eventually we would like to include all of the "not guilty" cases (need a volunteer to record them!).