“The function of the jury is to decide questions of fact,” the DOJ’s proposed questions suggested the judge say. “You are the sole judge of the facts and nothing that the Court or the lawyers say or do may encroach in any way on your role as the exclusive fact-finder. When it comes to the law, however, you are to take your instructions from the Court, and you are bound by those instructions. You may not substitute your own notions of what the law is, or what you think it should be.”