76
Opinion of the Court
own welfare and protection of others. Proof beyond a reasonable doubt was not required, but proof by preponderance of the evidence fell short of satisfying due process.3
When a person charged with having committed a crime is found not guilty by reason of insanity, however, a State may commit that person without satisfying the Addington burden with respect to mental illness and dangerousness. Jones v. United States, supra. Such a verdict, we observed in Jones, "establishes two facts: (i) the defendant committed an act that constitutes a criminal offense, and (ii) he committed the act because of mental illness," id., at 363, an illness that the defendant adequately proved in this context by a preponderance of the evidence. From these two facts, it could be properly inferred that at the time of the verdict, the defendant was still mentally ill and dangerous and hence could be committed.4
3 Justice Thomas in dissent complains that Foucha should not be released based on psychiatric opinion that he is not mentally ill because such opinion is not sufficiently precise—because psychiatry is not an exact science and psychiatrists widely disagree on what constitutes a mental illness. That may be true, but such opinion is reliable enough to permit the courts to base civil commitments on clear and convincing medical evidence that a person is mentally ill and dangerous and to base release decisions on qualified testimony that the person is no longer mentally ill or dangerous. It is also reliable enough for the State not to punish a person who by a preponderance of the evidence is found to have been insane at the time he committed a criminal act, to say nothing of not trying a person who is at the time found incompetent to understand the proceedings. And more to the point, medical predictions of dangerousness seem to be reliable enough for Justice Thomas to permit the State to continue to hold Foucha in a mental institution, even where the psychiatrist would say no more than that he would hesitate to certify that Foucha would not be dangerous to himself or others.
4 Justice Kennedy's assertion that we overrule the holding of Jones described in the above paragraph is fanciful at best. As that paragraph plainly shows, we do not question and fully accept that insanity acquittees may be initially held without complying with the procedures applicable to civil committees. As is evident from the ensuing paragraph of the text, we are also true to the further holding of Jones that both Justice Thomas
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