Cite as: 512 U. S. 573 (1994)
Opinion of the Court
ing probation, parole, or the sentencing range accompanying a lesser included offense. See United States v. Thigpen, 4 F. 3d 1573, 1578 (CA11 1993) (en banc), cert. pending, No. 93-6747; United States v. Frank, 956 F. 2d 872, 879 (CA9 1991), cert. denied, 506 U. S. 932 (1992). Because it is conceivable that some jurors might harbor misunderstandings with regard to these sentencing options, a district court, under Shannon's reasoning, might be obligated to give juries information regarding these possibilities as well. In short, if we pursue the logic of Shannon's position, the rule against informing jurors of the consequences of their verdicts would soon be swallowed by the exceptions.
Finally, Congress' recent action in this area counsels hesitation in invoking our supervisory powers. As noted above, the IDRA was the product of a thorough and exhaustive review of the insanity defense as used in the federal courts. Given the comprehensive nature of the task before it, Congress certainly could have included a provision requiring the instruction Shannon seeks. For whatever reason, Congress chose not to do so. Under these circumstances, we are reluctant to depart from well-established principles of criminal practice without more explicit guidance from Congress.
III
Although we conclude that the IDRA does not require an instruction concerning the consequences of an NGI verdict, and that such an instruction is not to be given as a matter of general practice, we recognize that an instruction of some form may be necessary under certain limited circumstances. If, for example, a witness or prosecutor states in the presence of the jury that a particular defendant would "go free" if found NGI, it may be necessary for the district court to intervene with an instruction to counter such a misstatement. The appropriate response, of course, will vary as is necessary to remedy the specific misstatement or error. We note this possibility merely so that our decision will not be
587
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