I do in-universe lawyer-ly things! This can include police notes (usually in the format a defence lawyer would see in disclosure), court transcripts, court decisions, etc. An example is my fic Re: Alastor Moody, RAC-00214/91. There are some additional endnotes at the end about lawyerly things but the first page is really how police notes and court transcripts work (the decision letter is accurate for a minor administrative/disciplinary proceeding).