In its more common sense it is when a federal judge decides to make comments on the evidence and how the jury should react to certain proofs at trial. Under statutory law, when evidence which is admissible as to one party or for one purpose but not admissible as to another party or for another purpose is admitted, the court, upon request, shall restrict the evidence to its proper scope and instruct the jury accordingly. Fed. R. Evid. 105. Attorneys usually make such statements in closing arguments. Many states allow judges this privilege.