Kinda-sorta fits the thread, but the SCOC has ruled that a police disciplinary matter that has been expunged from a member's service/employment record still has the be disclosed in a criminal trial.
www.scc-csc.ca
What has become known as a 'McNeil Report', police officers involved in a criminal prosecution have to disclose any disciplinary/misconduct records to the Crown. Most departments clear minor matters after a few years, but the Court said they may still be relevant.