dissenting.
Patuxent Institution is a special prison used by the State of Maryland for the incarceration of “defective delinquents.” Individuals who have demonstrated “persistent aggravated anti-social or criminal behavior,” who have “a propensity toward criminal activity,” and who have “either such intellectual deficiency or emotional unbalance” as to present “an actual danger to society” may be confined at Patuxent. Md. Ann. Code, Art 31B, §5(1971). The initial determination that one is a defective delinquent is made judicially and, for those confined to Patuxent after such a determination, there is the right to seek judicial redetermination of their status at three-year intervals. Id., §6 et seq. One of the objectives of Patuxent supposedly is to provide treatment for the inmates so that they may be returned to society. Director v. Daniels, 243 Md. 16, 31-32, 221 A. 2d 397, 406 (1966). Should a defective delinquent Pot receive treatment, or should the treatment prove inadequate to return him to society, the inmate might *359well remain in Patuxent for the remainder of his life. See McNeil v. Director, Patuxent Institution, ante, p. 245.
Petitioners brought this action in the District Court challenging various aspects of their confinement át Patuxent. The District Court depied relief, Sas v. Maryland, 295 F. Supp. 389 (Md. 1969); the Court of Appeals affirmed, Tippett v. Maryland, 436 F. 2d 1153 (CA4 1971); and we granted the petition for a writ of certiorari. 404 U. S. 999. Because Í base my decision on narrow grounds, I do not reach the broader issues tendered by petitioners.
When a State moves to deprive an individual"-of his liberty, to-incarcerate him indefinitely, or to place him behind bars for what may be the rest of his life, the. . Federal Constitution requires that it meet a more rigorous burdén óf proof than that employed by Maryland to commit defective delinquents. The Defective Delinquency Law does not specify the burden of proof necessary to commit an individual to Patuxent, but the Maryland Court of Appeals has determined that the State need only prove its case by the “fair preponderance of the evidence.” E. g., Crews v. Director, 245 Md. 174, 225 A. 2d 436 (1967); Termin v. Director, 243 Md. 689, 221 A. 2d 658 (1966); Dickerson v. Director, 235 Md. 668, 202 A. 2d 765 (1964); Purks v. State, 226 Md. 43, 171 A. 2d 726 (1961); Blizzard v. State, 218 Md. 384, 147 A. 2d 227 (1958); and see Sas v. Maryland, 334 F. 2d 506 (CA4 1964); Walker v. Director, 6 Md. App. 206, 250 A. 2d 900 (1969). Petitioners have thus been taken from their families and deprived of their consti.tutionally protected liberty under the same standard óf proof applicable to run-of-the-mill automobile negligence actions.1
*360The Court of Appeals disapproved this standard but, becausé it felt it insignificant, nonetheless held it to be consistent with the requirements of the Due Process Clause:
“We might all be happier had [the burden of persuasion] been stated in terms of clear and convincing proof rather than in terms of a preponderance of the evidence. However meaningful the distinction may be to us as judges, however, it is greatly-to be doubted that a jury’s .verdict would ever be influenced by the choice of one standard or the other; We all know that juries apply the preponderance standard quite flexibly, depending upon the nature of the case. In any event, in the present state of our knowledge, choice of the standard *361of proof should be left to the state. A legislative [sic] choice of the preponderance standard, the same standard governing civil commitments of mentally ill persons who have no history of criminality, ought not to be held in violation of due process requirements when we have no firm foundation for an evaluation of the practical effects of the choice.” Tippett v. Maryland, supra, at 1158-1159.
Judge Sobeloff dissented in part and would have held the State to a more stringent burden:
“The reasonable doubt standard is indispensable in both criminal and juvenile proceedings ... for ‘it impresses on the trier of fact the necessity of reaching a subjective state of certitude of the facts in issue.’ . . .
“The objections to the preponderance standard apply with equal force in defective delinquency hearings — indeed they are even more compelling in the latter class of cases, since indefinite incarceration is at stake. Due process commands that the jury must be satisfied beyond a reasonable doubt as to all objective facts in dispute, including the truth of any alleged incidents relied upon by the psychiatrists in reaching their recommendation.” Id., at 1165 (citations omitted).
In considering the constitutionally mandated burdens of proof applicable to particular types of cases, our decisions have attached greater significance to the varying standards than did the Court of. Appeals below. In Speiser v. Randall, 357 U. S. 513, 520-521 (1958), we said:
“To experienced lawyers it is commonplace that the outcome of a lawsuit — and hence the vindication of legal rights — depends more often on. how the factfinder appraises the facts than on a disputed *362construction of a statute or interpretation of a line of precedents. Thus the procedures by which the facts of the case are determined assume, an importance fully as great as the validity of the substantive rule of law to be applied. And the more important the ' rights at stake the more important must be the procedural safeguards surrounding tliose rights.”
And see In re Winship, 397 U. S. 358, 368 (1970) (Harlan, J., concurring).
The reason for our continued concern over the applicable burden of proof is that a lawsuit — like any other factfinding process — is necessarily susceptible of error in the making of factual determinations. The nature of the rights implicated in the lawsuit thus determines the allocation and degree of the burden of proof and consequently the party upon whom, the risk of errors in the factfinding process will be placed. We applied this reasoning in Speiser, where First Amendment rights were implicated:
. “In all kinds of litigation it is plain that where the burden of proof lies may be decisive of the outcome. There is always in litigation a margin of error, representing error in factfinding, which both parties must take into account.' Where one' party has at stake an interest of transcending value — as a criminal defendant his liberty — this margin of error is reduced as to him by the process of placing on the other party the burden of producing a sufficiency of proof in the first instance, and of persuading the fact-finder at the conclusion of the trial of his guilt beyond a reasonable doubt. Due process commands that no man shall lose his liberty unless the Government has borne the burden of producing the evidence and convincing the factfinder of his guilt.” -.357 U. S., at 525-526 (citations omitted).
*363In Rosenbloom v. Metromedia, Inc., 403 U. S. 29 (1971), Me. Justice Brennan, in an opinion joined by The Chief Justice and Mr. Justice Blackmun, again applied these principles and reasoned that the important First Amendment intérests present in defamation actions required plaintiffs to meet an extraordinary burden of proof. Justice Brennan said, “In libel cases ... an erroneous verdict for the plaintiff [is] most serious. . . . [T]he possibility of such error . . . would create a strong impetus toward self-censorship which the First Amendment cannot tolerate.” Id., at 50. Mr. Justice Brennan thus concluded that a more rigorous burden of proof was necessary to safeguard the important First Amendment rights involved:
“We ... hold that a libel action ... by a private individual against a licensed radio station for a defamatory falsehood in a newscast relating to his involvement in an event of public or general concern may be sustained only upon clear and convincing proof that the defamatory falsehood was published with knowledge that it was false or with reckless disregard' of whether it was false or not.” Id., at 52.
In re Winship, supra, dealt with an individual’s personal liberty which we had characterized as “an interest of transcending value” in Speiser, 357 U. S., at 525. There, we determined that “proof beyond a reasonable doubt” was constitutionally required “because of the possibility that [an individual might] lose his liberty” and because of the stigma of a criminal conviction. 397 U. S., at 363. And see Woodby v. Immigration and Naturalization Service, 385 U. S. 276, 285 (1966).
In the present case, petitioners were deprived of their most basic right — their personal liberty — under a burden of proof which was constitutionally inadequate. The *364right to liberty is. one of transcendent value. Without it, other constitutionally protected rights such as the right of free expression and the right of privacy become largely meaningless. Yet Maryland has deprived petitioners of this right, using a burden of proof which fáils to give sufficiént weight to the interests involved.
It is no answer to say that petitioners’ commitments were in “civil” proceedings and that the requirement for proof beyond a reasonable doubt is required only in “criminal” cases. In re Gault, 387 U. S. 1 (1967), and In re Winship, supra, specifically rejected this distinction and looked instead at the interests involved and .the actual nature of the proceedings. See also Baxstrom v. Herold, 383 U. S. 107 (1966); Specht v. Patterson, 386 U. S. 605 (1967). Nor would it be persuasive to argue that the difficulty in proving one’s state of mind requires that the State be afforded the benefit of a lesser burden of proof. Proving a state of mind is no more difficult than many other issues with which courts and juries grapple each day.2 An individual who is confronted with *365the possibility of commitment, moreover, runs the risk of losing his most important right — his liberty.
Speisér and Winship indicate that an individual’s personal liberty is an interest of transcending value for the deprivation of which the State must prove its case beyond a reasonable doubt. I would follow established precedent and hold that a State may not subject individuals to lengthy — if not indefinite — incarceration under a lesser burden of proof. Accordingly,- I would reverse the judgment below.
In petitioner Murel’s redetermination hearing on December 21, 1964, for example, the trial court instructed the jury: “The burden is on the State to prove by a preponderance of evidence, as I' have *360stated to you, that the defendant does come within all phases of the definition of a defective delinquent.” Trial Transcript. 7Ó.
The jury instructions in petitioner Creswell’s December 20, 1961, redetermination trial were similar:
“The burden of proof in this particular casé is governed by our normal civil rules of evidence; The burden of proof is on the State to satisfy you that this defendant is a defective delinquent. If the State has not satisfied you by a fair preponderance of the evidence that he is a defective delinquent, or if your minds are in a state of equal balance, or even balance, after considering all the evidence as to whether he is or is not a defective delinquent, then it is your duty to find him to be. not a defective delinquent.
“However, if you are satisfied by a fair preponderance of the evidence that he is a defective delinquent, then it. is yoür duty to •so find him to be such defective delinquent.” Trial Transcript 75-76.
The record developed in the District Court also included the jury instructions in the October 30, 1959, redetermination hearing of Charles Tippett, who was a petitioner in the District Court:
“The Court informs you that having once been determined.to be • a defective delinquent and now that he comes before you and a-slrs to be released as cured of whatever defect there was, the burden is on him to convince you by a fair preponderance of the testimony that.that is so.” Trial Transcript 40.
Bruce J. Ennis, Staff Attorney of the New York Civil Liberties Union and Director of the Civil Liberties and Mental Illness Project, testified as follows before the Subcommittee on Constitutional Rights of the Senate Committee on the Judiciary, 91st Cong., 1st & 2d Sess., 277-278 (1969 and 1970):
“As I mentioned earlier, the mentally ill are possibly less dangerous than the mentally healthy. A five and a half year study of 5,000 patients discharged from New York State mental hospitals showed that 'patients .with no record of prior arrest have a strikingly low rate of arrest after release. . . . Their over-all rate of arrest is less than Vi2 that of the general population and the rate for each separate offense is also far lower, especially for more serious charges.’ ■ Another psychiatrist states that there is ‘not a shred of evidence that the mentally ill are any more dangerous than the mentally healthy.’ A diagnosis of mental illness tells' its nothing about whether the person so diagnosed is or is not dangerous. Some mental patients are dangerous, some are not. Perhaps the psychiatrist is an expert at deciding whether.a person is mentally ill, but is he an expert at predicting *365which of. the persons so diagnosed are dangerous? Sane people, too, are dangerous, and it may legitimately be inquired whether there is anything in the education, training or experience of psychiatrists which renders them particularly adept at predicting dangerous behavior. Predictions of dangerous behavior, no matter who makes them, are incredibly inaccurate, and there is a growing consensus that psychiatrists are not uniquely qualified to predict dangerous behavior and are, in fact, less accurate in their predictions than other professionals.
“Because predictions of dangerous behavior are so grossly unreliable, we should authorize confinement only if the predicted danger is proved ‘beyond a reasonable doubt’ rather than by a mere preponderance of the evidence.” (Footnotes omitted.)