Arthur Andersen, LLP v. United States

In this case, in which one of the last remaining big accounting firms was essentially driven out of business, the entire conviction hinged on edits made to one memo by one in-house lawyer--edits that any reasonable person would consider permissible and even necessary to the representation of a client. Among many other arguments, NACDL urged in its brief that the trial judge's jury instruction on obstruction of justice criminalized entirely lawful conduct.