Yes, three vice squad cops – Francis John Cawley, Michael Kenneth Clayton and Brian Edwin Hudson – were charged with Duncan’s manslaughter. But due to lack of witnesses the outcome was predictable. Charges against Hudson were dismissed at committal hearings because of insufficient evidence. Cawley and Clayton faced trial and were acquitted, by jury, in 1988. As this article explains, it was not the only SA cops had been accused of throwing people into the Torrens River – https://indaily.com.au/opinion/2022/03/04/duncan-drowning-files-a-disturbing-reminder-of-past-attitudes/