Opinion
MOSK, J.
Professor Wigmore perceptively observes that “The mental condition of one whose mind is so deranged as to require imprisonment for his own and others’ good is indeed pitiable. But the mental attitude of one who is falsely found insane and relegated to life imprisonment is [May 1975] [310]*310beyond conception. No greater cruelty can be committed in the name of the law.” (5 Wigmore on Evidence (Chadbourn rev. 1974) § 1400, p. 201.)
Surely it is no less cruel to falsely find a man to be a “mentally disordered sex offender” and confine him indefinitely in a prison-like state mental institution. Against such grievous errors the law has erected sturdy bulwarks of procedure. In the quoted paragraph, for example, Professor Wigmore stresses the importance of the right of confrontation. No less critical is the standard of proof—the degree of persuasion which the plaintiff must achieve in the minds of the judge or jury in order to invoke the coercive powers of the state against the defendant. The law wisely proportions this standard to the gravity of the consequences of an erroneous judgment: thus a criminal charge must be proved beyond a reasonable doubt, while an ordinary claim of breach of contract may be established by a preponderance of the evidence. (See generally In re ' Winship (1970) 397 U.S. 358, 369-372 [25 L.Ed.2d 368, 378-380, 90 S.Ct. 1068] (Harlan, J., concurring).)
In the case at bar we are called upon to determine the proper standard of proof in mentally disordered sex offender proceedings. As we shall explain, we reject the asserted right of the state to publicly brand a man as a mentally disordered sex offender and lock him up for an indeterminate period in a maximum security mental hospital on a mere preponderance of the evidence, i.e.; “under the same standard of proof applicable to run-of-the-mill automobile negligence actions.” (Fn. omitted.) (Murel v. Baltimore City Criminal Court (1972) 407 U.S. 355, 359 [32 L.Ed.2d 791, 794, 92 S.Ct. 2091] (Douglas, J., dissenting from dismissal of certiorari).) We hold, rather, that in order to comply with the requirements of the due process clauses of the California and federal Constitutions, so drastic an impairment of the liberty and reputation of an individual must be justified by proof beyond a reasonable doubt.
The case is before us on an appeal by defendant Burnick (Pen. Code, § 1237, subd. 1) from an order adjudging him to be a mentally disordered sex offender within the meaning of Welfare and Institutions Code section 6300.1 The code provides that when a person is convicted of any offense [311]*311the trial judge may adjourn the proceedings and certify the person to the superior court for a hearing if it appears to the judge there is probable cause for believing him to be a mentally disordered sex offender. (§ 6302.) This procedure was followed in the case at bar.2 The court found Burnick to be a mentally disordered sex offender, and committed him to Atascadero State Hospital for an indeterminate period. (§ 6316.) Burnick demanded a jury trial of the issue (§ 6318), but subsequently waived a jury and went to trial before the court. Prior to the taking of testimony Burnick requested that the court apply the standard of proof beyond a reasonable doubt in making its determination. The court refused the request and ruled that it would decide the case by a preponderance of the evidence. Under that standard, Burnick was again found to be a mentally disordered sex offender and a second order was made committing him to Atascadero for an indefinite period. (§ 6321.)
I
The importance of the standard of proof in mentally disordered sex offender proceedings is well illustrated by the case at bar. The evidentiary facts are uncomplicated. From psychiatric interviews and probation and other reports it developed that at age 12 Burnick had certain limited sexual contacts with men. He married, apparently while still a teenager, but his wife died in childbirth. For several years after her death he had no sexual relations with women. At the time of the events in question he was 28 years old, and was employed in a shop selling psychedelic art and materials. He became acquainted with two boys aged 13 and 15 years, and the three were friends for approximately a year. In the course of the latter months of that year they engaged in four to six consensual sexual acts, which were the basis of the charges brought against Burnick. He has no record whatever of violence, or of previous violations of law.
From these facts three psychiatrists, all eminently qualified by training and experience as experts on the subject of mentally disordered sex offenders, drew widely differing conclusions as to both Burnick’s diagnosis and prognosis..
[312]*312Dr. Alvin Davis, the sole witness for the prosecution, gave as his opinion that Burnick was a homosexual pedophile, i.e., a man who engages in sexual activities with adolescent boys; that he was likely to repeat such acts in the future; and that the conduct would be “dangerous to the health and safety of others” (§ 6300), but only in the sense that youths who were still “undecided” about their sexual identity might be influenced towards homosexuality because of their experiences with Burnick. On cross-examination, Dr. Davis conceded that a child’s sexual identity begins to be formed early in life, long before puberty; that it is possible Burnick would limit his contacts to youths who were already homosexually oriented; and that his conduct would pose no danger to those who were either heterosexuals or confirmed homosexuals.
Two psychiatrists testified for the defense, and their views were in clear conflict with those of Dr. Davis. Dr. Michael Coburn denied that Burnick was a homosexual: although he had participated in both heterosexual and homosexual conduct on occasion, “he is not a homosexual in the commonly understood, meaning of the term. He is predominantly heterosexual in his past.” Nor was he pedophilic: “I don’t find him to be sexually attracted to pre-pubital human beings of either sex. . . . His interest is not in children but in sexually mature individuals, whether or not their age be mature.” Dr. Coburn’s diagnosis was twofold: that Burnick had a highly immature personality, and that he suffered from a long-standing depression resulting from an inability to deal in a realistic way with the death of his wife.
The witness acknowledged that in standard psychiatric nomenclature both immature personality and depression are classified as “character disorders.” But whether or not that general term is the equivalent of the statutory phrase, “mental defect, disease, or disorder” (§ 6300), Dr. Coburn firmly concluded that Burnick was not “dangerous to the health and safety of others.” Although it was “possible” that he might again engage in acts such as those charged, it was not “likely” because the events had caused him increased guilt feelings and decreased sexual pleasure. In any case, Dr. Coburn was of the opinion that isolated acts such as here involved would have no more than a slight effect on the sexual development of even an “undecided” adolescent.3
[313]*313Dr. Andre Tweed also refused to classify Burnick as a homosexual, stressing his heterosexual activities. Rather, he found Burnick to be an immature person whose homosexual experiences were entirely situational. The witness recognized that immature personality is classified as a “character disorder” in professional terminology, but explained that the label merely means that “your behavior does not conform to that which society sets up at that particular moment as being the so-called norm.”4
Dr. Tweed further stated that in his opinion Burnick was not a pedophile. The youths with whom he was involved were not children, and in the doctor’s opinion had probably initiated the encounters themselves. Adolescents were not Bumick’s primary interest: “I don’t believe that he is the type of individual who would go out and actively solicit activities with that particular age group.” Rather, his sexual feelings were “directed more toward consenting adults.” In any event, according to Dr. Tweed, the average adolescent today has generally had “some type of sexual experience, heterosexual or homosexual, and it doesn’t affect him one way or the other.”
For these reasons Dr. Tweed fully agreed with Dr. Cobum’s conclusion that Burnick was not “dangerous to the health and safety of others” and was not a mentally disordered sex offender.
No other witness testified, and no documentary evidence was introduced. In oral argument defense counsel sharply challenged the adequacy of the People’s proof of each element of their case, urging for example that when we deal with “the possible deprivation of liberty of an individual for his natural life ... we need something more than just mere personality disorder,” and that the speculative risk of his influencing some youths towards homosexuality is not “a sufficient danger to take away Mr. Burnick’s liberty for such a prolonged period of time.” The court nevertheless found, by an asserted preponderance of the evidence, that Burnick was a mentally disordered sex offender within the meaning of section 6300.
II
The record shows that the trial court felt compelled to decide the issue by a preponderance of the evidence because of the statutory directive [314]*314that in mentally disordered sex offender proceedings “The trial shall be had as provided by law for the trial of civil causes ....” (§ 6321.) But it is apparent from the face of the statute that it does not mandate any particular standard of proof, nor - does any other provision of the mentally disordered sex offender law. (See, e.g., § 6316.) The matter is therefore controlled by the general provisions of section 115 of the Evidence Code, which declares in relevant part that “Except as otherwise provided by law, the burden of proof requires proof by a preponderance of the evidence.” (Italics added.) According to the comment to that section by the Assembly Committee on Judiciary, the exception means, “unless a heavier or lesser burden of proof is specifically required in a particular case by constitutional, statutory, or decisional law.” (Italics added.) Evidence Code section 160 defines “law” in the same tripartite terms, and the draftsman’s comment thereto reiterates that “a reference [in the Evidence Code] to law’ includes the law established by judicial decisions as well as by constitutional and statutory provisions.” Nor is this surprising, as the choice of standard of proof “is the kind of question which has traditionally been left to the judiciary to resolve . . . .” (Fn. omitted.) (Woodby v. Immigration Service (1966) 385 U.S. 276, 284 [17 L.Ed.2d 362, 368, 87 S.Ct. 483].)
That question, accordingly, is not answered by the People’s reliance on the general proposition that mentally disordered sex offender proceedings are “civil in nature.” (See, e.g., In re Bevill (1968) 68 Cal.2d 854, 858 [69 Cal.Rptr. 599, 442 P.2d 679].) Nor is it necessary to inquire into the constitutionality of the quoted language of section 6321 or Evidence Code section 115. Rather we apply those statutes, and proceed to determine whether the standard of proof beyond a reasonable doubt is “otherwise required” in mentally disordered sex offender proceedings. Yet in so doing we are moved by constitutional considerations of the highest order, inasmuch as we discharge our duty to insure that no person be deprived of his liberty without the due process of law guaranteed by article I, section 7, subdivision (a), of the California Constitution, and the Fourteenth Amendment to the United States Constitution.5
[315]*315In the absence of California cases in point, we find guidance in recent decisions of the United States Supreme Court. The first is Specht v. Patterson (1967) 386 U.S. 605 [18 L.Ed.2d 326, 87 S.CT. 1209], dealing with a “sexual psychopath” statute essentially similar in outline and purpose to the legislation here challenged. The Colorado Sex Offenders Act provided that if the trial court was of the opinion that a defendant convicted of a specified sex offense “constitutes a threat of bodily harm to members of the public, or is an habitual offender and mentally ill,” he could be sentenced to an indeterminate term of one day to life upon a psychiatric examination and report. There was no formal hearing under the statute.
A defendant who had been thus sentenced sought federal habeas corpus, and the United States Supreme Court unanimously reversed a denial of that remedy. The court expressly declined (at p. 608 [18 L.Ed.2d at p. 329]) to extend to this area its holding in Williams v. New York (1949) 337 U.S. 241, 249-250 [ 93 L.Ed. 1337, 1343-1344, 69 S.Ct. 1079], that due process does not require a full hearing with right of cross-examination at the time of fixing sentence. Rather, the court reasoned, “These commitment proceedings whether denominated civil or criminal are subject both to the Equal Protection Clause of the Fourteenth Amendment as we held in Baxstrom v. Herold, 383 U.S. 107, and to the Due Process Clause. We hold that the requirements of due process were not satisfied here.
“The Sex Offenders Act does not make the commission of a specified crime the basis for sentencing. It makes one conviction the basis for commencing another proceeding under another Act to determine whether a person constitutes a threat of bodily harm to the public, or is an habitual offender and mentally ill. That is a new finding of fact [citation] that was not an ingredient of the offense charged. The punishment under the second Act' is criminal punishment even though it is designed not so much as retribution as it is to keep individuals from inflicting future harm.” (Italics added; fn. omitted.) (386 U.S. at pp. 608-609 [18 L.Ed.2d at p. 329].)
This language repays close examination. To begin with, the court here disregarded the “civil label of convenience” one month before its landmark decision in In re Gault (1967) 387 U.S. 1 [18 L.Ed.2d 527, 87 S.Ct. 1428].6 Nor was the court deceived by the fact that the purpose of [316]*316the confinement was not primarily retribution. Instead the court penetrated directly to the substance of the proceeding and examined the relationship between the original conviction and the ensuing commitment inquiry, holding that the latter must satisfy both equal protection and due process. The court noted that the purpose of the commitment proceeding was to determine whether the defendant “constitutes” a danger to others or “is” a mentally ill habitual offender. That determination, said the court, “is a new finding of fact . . . that was not an ingredient of the offense charged.”7
An identical analysis applies to the California mentally disordered sex offender law. We begin with the simple grammatical fact that our statute speaks in the present rather than the future tense: section 6300 defines a mentally disordered sex offender as a person (1) who suffers, i.e., at the present time, from a “mental defect, disease, or disorder” and (2) who “is” thereby predisposed to commit sex crimes to such a degree that (3) he “is” a danger to others. These are inquiries into the defendant’s present state of mind and risk of harm, and they are indistinguishable from the issues raised by the statute involved in Specht, i.e., whether the defendant “is” a mentally ill habitual offender or “constitutes” a danger to others. As in Specht, therefore, their resolution, in the commitment proceeding is a “new finding of fact. . . that was not an ingredient of the offense charged.”
The Specht court then listed the several respects in which the Colorado statute failed to provide due process: that constitutional guarantee “requires that [the defendant] be present with counsel, have an opportunity to be heard, be confronted with witnesses against him, have the right to cross-examine, and to offer evidence of his own. And there must be findings adequate to make meaningful any appeal that is allowed.” (386 U.S. at p: 610 [18 L.Ed.2d at p. 330].) We recognize that the right to jury trial and the standard of proof beyond a reasonable doubt are not mentioned among the. rights thus enumerated. For at least two reasons, [317]*317however, the omission of such matters from the Specht opinion is without significance.
First, a careful reading of Specht and the lower court opinions in that case shows that the petitioner did not specifically claim the right to a jury trial or proof beyond a reasonable doubt; those issues, accordingly, were not presented to the United States Supreme Court. In the federal system no less than in California, cases are not authority for propositions not considered. {In re Tartar (1959) 52 Cal.2d 250, 258 [339 P.2d 553], and cases cited.) Second, the precise holding of Specht was that the Colorado statute was deficient in due process “as measured by the requirements of the Fourteenth Amendment.” (386 U.S. at p. 611 [18 L.Ed.2d at p. 331].) But as of the date of Specht (1967) the Supreme Court had not yet held that the due process clause of the federal Constitution requires the states to guarantee a jury trial in criminal cases and the protection of proof beyond a reasonable doubt.8 The awaited rulings of the high federal court did not come until 1968 in the case of jury trial (Duncan v. Louisiana, 391 U.S. 145, 149 [20 L.Ed.2d 491, 496, 88 S.Ct. 1444]) and 1970 for proof beyond a reasonable doubt (In re Winship, supra, 397 U.S. 358, 364 [25 L.Ed.2d 368, 375]; see People v. Vann (1974) 12 Cal.3d 220, 227-228 [115 Cal.Rptr. 352, 524 P.2d 824]).
Yet if Specht did not prophesy each and every step in the future development of the role that due process must play in these commitment proceedings, it clearly pointed the way. The court quoted the following language from United States v. Maroney (3d Cir. 1966) supra, 355 F.2d 302, 312: “It is a separate criminal proceeding which may be invoked after conviction of one of the specified crimes. Petitioner therefore was entitled to a full judicial hearing before the magnified sentence was imposed. At such a hearing the requirements of due process cannot be satisfied by partial or niggardly procedural protections. A defendant in such a proceeding is entitled to the full panoply of the relevant protections [318]*318which due process guarantees in state criminal proceedings. He must be afforded all those safeguards which are fundamental rights and essential to a fair trial, including the right to confront and cross-examine the witnesses against him.” (Italics added.) The Specht court unequivocally adopted this language as its own, saying, “We agree with that view.” (386 U.S. at p. 610 [18 L.Ed.2d at p. 330].)
In light of the fundamental similarity between the sexual psychopath proceedings challenged in Specht and in the case at bar, the question before us is whether proof beyond a reasonable doubt is among the “full panoply of the relevant protections which due process guarantees in state criminal proceedings.” The answer was definitively given by the Supreme Court in the second case here in point, In re Winship (1970) supra, 397 U.S. 358.
As noted above, Winship declared that in criminal cases the due process clause protects the accused against conviction except upon proof beyond a reasonable doubt. Particularly important for our purposes is the court’s dual justification for that rule: “The requirement of proof beyond a reasonable doubt has this vital role in our criminal procedure for cogent reasons. The accused during a criminal prosecution has at stake interests of immense importance, both because of the possibility that he may lose his liberty upon conviction and because of the certainty that he would be stigmatized by the conviction.” (Italics added.) (397 U.S. at p. 363 [25 L.Ed.2d at p. 375].) The court then recalled (at pp. 365-366 [25 L.Ed.2d atpp. 375-377]) that Gault had shown how the same two consequences flow from an adjudication of juvenile delinquency.9 Accordingly, the court concluded (at p. 367 [25 L.Ed.2d at p. 377]) that the safeguard of proof beyond a reasonable doubt must extend to juvenile proceedings as well: judicial intervention in the child’s life for his own good, said the court, “cánnot take the form of subjecting the child to the stigma of a finding that he violated a criminal law and to the possibility of institutional confinement on proof insufficient to convict him were he an adult.” (Fn. omitted.)
Again the Supreme Court’s analysis applies equally—if not more so—to the California mentally disordered sex offender law. First, as we recognized in Gross v. Superior Court (1954) 42 Cal.2d 816, 821 [319]*319[270 P.2d 1025], when a man is charged with being a mentally disordered sex offender “His liberty is at stake.” That threat is fulfilled in the order of commitment. In common with all those confined against their will for treatment of mental illness, a person committed under our statute suffers a “massive curtailment of liberty” (Humphrey v. Cady (1972) supra, 405 U.S. 504, 509 [31 L.Ed.2d 394, 402]). Indeed, his personal deprivation is far in excess of that experienced by a youth adjudged to be a juvenile delinquent.
To begin with, the juvenile may or may not be confined in an institution; other less drastic methods of control are available, including placement in a “suitable family home” or release on probation. (Welf. & Inst. Code, § 727 et seq.) By contrast, if the court determines that a mentally disordered sex offender could benefit from treatment and that criminal proceedings against him should not be resumed, it has no option but to order him committed “for placement in a state hospital.” (§§ 6316, 6321.) There is no half-way house, no outpatient alternative.
Nor is there any doubt that such commitment to a “state hospital” results in a real deprivation of liberty. Like all persons found to be treatable mentally disordered sex offenders in California, Burnick was committed by the court to Atascadero State Hospital. Let us not deceive ourselves as to the nature of that institution. (Cf. In re Gault (1967) supra, 387 U.S. 1, 27 [18 L.Ed.2d 527, 545-546].) It was frankly described as follows by a distinguished body of the medical profession.10 “In its physical appearance, this is much more like a prison than a hospital. In its architectural planning, it disregards the modern psychiatric concept of the therapeutic community. There are bare corridors, bars, iron gates, rows of cells—all the stigmata of punishment rather than treatment. Patients who occupy individual rooms are locked out of them during the day and have no opportunity to withdraw for privacy. Patients in wards have a reasonable amount of mobility from one area of the hospital to another, although security precautions are in evidence everywhere. . . . [11] Externally, the plant has a misleadingly attractive appearance. Internally, despite its dehumanizing attributes, it is well-maintained and well-equipped and might be characterized as a sanitary dungeon.” Other [320]*320observers have confirmed this description.11 And lest it be thought that only outsiders characterize this institution as essentially indistinguishable from a prison, consider the testimony of Dr. Harold M. Rogallo, senior psychiatrist on the Atascadero staff:12 Dr. Rogallo identified Atascadero as the only “maximum security” hospital in the Department of Mental Hygiene; noting the fact that “it is all locked and it is under strict supervision, and we have approximately fifty security officers for a population of about thirteen hundred and fifty patients,” Dr. Rogallo concluded unequivocally, “Our hospital is pretty much bordering, you might say, [on] a correction facility. . . .” We shall not presume to contradict this appraisal by a senior staff member of the very institution in question.
Not only is the mentally disordered sex offender’s loss of freedom more severe than that of the juvenile, it is also of a much longer duration. Any confinement of the juvenile is ordinarily limited by law to a few years at most, terminating automatically when he reaches age 21 or shortly thereafter. (Welf. & Inst. Code, §§ 1769-1771; but see §§ 1800-1803.) A person adjudicated a mentally disordered sex offender, however, is committed “for an indeterminate period” (Welf. & [321]*321Inst. Code, §§ 6316, 6326). The statute means what it says: the individual can be detained for any length of time whatever—potentially for life. Moreover, release depends not on his reaching a certain age or the end of a fixed term, but on the “opinion” of the hospital superintendent that he will not “benefit” from further treatment and is no longer “a danger” (§ 6325)—a highly discretionary standard difficult to review. Under our statutory scheme, therefore, a mentally disordered sex offender's deliverance can be many years in the uncertain future.13
The second justification for the standard of proof beyond a reasonable doubt relied on in Winship is the “stigma” and loss of “good name” (397 U.S. at pp. 363, 364, 367 [25 L.Ed.2d at pp. 374, 375, 377]) which follow from a criminal conviction or an adjudication of juvenile delinquency. Surely no less a stigma results from a judicial pronouncement that a man is both “mentally disordered” and a “sex offender.” In the ideal society, the mentally ill would be the subjects of understanding and compassion rather than ignorance and aversion. But that enlightened view, unfortunately, does not yet prevail. The stigma borne by the mentally ill has frequently been identified in the literature: “a former mental patient may suffer from the social opprobrium which attaches to treatment for mental illness and which may have more severe consequences than do the .formally imposed disabilities. Many people have an ‘irrational fear of the mentally ill.’ The former mental patient is likely to be treated with distrust and even loathing; he may be socially ostracized and victimized by employment and educational discrimination. Finally, the individual’s hospitalization and posthospitalization experience may cause him to lose self-confidence and self-esteem. [¶] The legal and social consequences of commitment constitute the stigma of mental illness, a stigma that could be as socially debilitating as that of a criminal conviction.” (Fns. omitted.) (Developments in the Law—Civil Commitment of the Mentally III (1974) 87 Harv.L.Rev. 1190, 1200-1201; accord, Rosenhan, On Being Sane in Insane Places (1973) 13 Santa Clara Law. 379, 385, and authorities cited in fn. 11.)
When to that stigma is added a charge of unlawful sexual behavior, the shame is complete. This is not an open question in California, as our courts have recognized the odium which commonly attaches to the status of mentally disordered sex offender. Thus in People v. Fuller (1964) 226 Cal.App.2d 331, 335 [38 Cal.Rptr. 25], the court noted the Legislature [322]*322has provided that the greatest care is to be taken “before the stigma of sexual psychopathy is finally attached to an individual . . . .” And a subsequent discharge from that commitment does not moot his appeal because, we explained in People v. Succop (1967) 67 Cal.2d 785, 790 [63 Cal.Rptr. 569, 433 P.2d 473], the defendant is entitled to the opportunity to “clear his name” of the adjudication that he is a mentally disordered sex offender.
In fact, the stigma of such an adjudication is greater than that of juvenile delinquency. The latter proceedings are conducted in privacy: the statute flatly declares that “the public shall not be admitted” (Welf. & Inst. Code, § 676; see also § 675). Moreover, five years after the juvenile court’s jurisdiction terminates, the judge or probation officer “may destroy all records and papers in the proceedings concerning the minor.” (§ 826, subd. (a).) No such confidentiality surrounds a mentally disordered sex offender trial, which is open to the public and hence to the news media; and such trial, of course, results in permanently accessible public records of the event and its outcome.
Secondly, to the extent they do become known, acts of juvenile misconduct are often minimized or forgiven on such commonplace rationalizations as “boys will'be boys” or “youth will have its fling,” coupled with a belief of folk psychology that the miscreant is just “going through a stage” and with maturity will “outgrow” his bad habits. No such indulgence is shown towards the convicted mentally disordered sex offender, however immature or impulsive he may be. He remains forever a pariah, branded with the twin marks of mental and sexual abnormality.
It follows from the foregoing that the standard of proof in mentally disordered sex offender proceedings must be as high as it is in juvenile delinquency proceedings—to wit, proof beyond a reasonable doubt. Anything less will fall short of providing the level of due process required by the California and federal Constitutions.
The message of the Supreme Court decisions has been clearly understood by our brethren on the federal bench. Speaking of a sexual psychopath law providing for indeterminate commitment, the First Circuit Court of Appeals recognized “the inmate’s right to avoid a grievous loss of liberty and lifetime stigma except under the most rigorous safeguards.” (Sarzen v. Gaughan (1st Cir. 1973) 489 F.2d 1076, 1083.) In holding that a person involuntarily committed to a state mental hospital has a constitutional right to treatment, the Fifth Circuit Court of [323]*323Appeals took special note of “the indisputable fact that civil commitment entails a ‘massive curtailment of liberty’ in the constitutional sense. Humphrey v. Cady, 1972, 405 U.S. 504, 509, 92 S.Ct. 1048, 31 L.Ed.2d 394. The destruction of an individual’s personal freedoms effected by civil commitment is scarcely less total than that effected by confinement in a penitentiary. Indeed, civil commitment, because it is for an indefinite term, may in some ways involve a more serious abridgement of personal freedom than imprisonment for commission of a crime usually does. Civil commitment involves stigmatizing the affected individuals, and the stigma attached, though in theory less severe than the stigma attached to criminal conviction, may in reality be as severe, or more so.” (Fn. omitted.) (Donaldson v. O’Connor (5th Cir. 1974) 493 F.2d 507, 520, cert, granted (1974) 419 U.S. 894 [42 L.Ed.2d 138, 95 S.Ct. 171].)
From these premises the courts have drawn the conclusion that the due process clause requires proof beyond a reasonable doubt in proceedings leading to involuntary commitment of persons found to be both mentally ill and dangerous. Thus in an opinion authored by Judge Robert A. Sprecher of the Seventh Circuit Court of Appeals for a three-judge district court, it was declared that the reasons for the holding in Winship as to juvenile delinquents apply a fortiori to commitments of the mentally ill: “The [ Winship] argument for a stringent standard of proof is more compelling in the case of a civil commitment in which an individual will be deprived of basic civil rights and be certainly stigmatized by the lack of confidentiality of the adjudication. We therefore hold that the state must prove beyond a reasonable doubt all facts necessary to show that an individual is mentally ill and dangerous.” (Lessard v. Schmidt (E.D.Wis. 1972) 349 F.Supp. 1078, 1095, vacated on other grounds sub nom. Schmidt v. Lessard (1974) 414 U.S. 473 [38 L.Ed.2d 661, 94 S.Ct. 713]; accord, Denton v. Commonwealth (Ky. 1964) 383 S.W.2d 681.)
Again, the Court of Appeals of the District of Columbia Circuit unanimously so held in In re Ballay (1973) 482 F.2d 648 [157 App.D.C. 59]. Reversing a judgment of commitment because the jury was permitted to find by a mere preponderance of the evidence that Ballay was mentally ill and likely to be dangerous, the court held the due process clause requires such issues to be proved beyond a reasonable doubt. Its detailed and well reasoned opinion makes many points relevant to our present concern, including the absence of any additional administrative burden if the standard of proof beyond a reasonable doubt is used (id. at pp. 656, 663) and the fact that psychiatric testimony [324]*324either diagnosing mental disorder or predicting future dangerousness is “far from satisfactory” and has “never been characterized by a high degree of accuracy.” (Id. at pp. 665, 666.)
In its concluding argument the Ballay court analyzed the Winship decision and applied the Supreme Court’s rationale to the case at hand (id. at p. 668): “the loss of liberty—the interest of ‘transcending value’ [citing Speiser v. Randall (1958) 357 Ú.S. 513, 525 (2 L.Ed.2d 1460, 1472)]—is obviously as great for those civilly committed as for the criminal or juvenile delinquent. Indeed, it may be greater in the former since the statute provides for indefinite commitment. The only question is whether the ‘stigma’ associated with involuntary civil commitment is as severe as the stigma of finding that an individual committed a crime. Even accepting recent medical advances, current studies clearly indicate the fallacy of contending that most people view mental illness as a disease similar to any physical ailment of the body.” (Fns. omitted.)14 The court then reasoned as follows (id at p. 669): “In Winship, the Court concluded that while the consequences of being adjudged a juvenile delinquent were not identical to being adjudged a criminal, the differences were not sufficient to support a distinction in the standard of proof. This was despite the fhct that, unlike involuntary civil commitment, being adjudged delinquent did not deprive the child of his civil rights nor did the statute, which called for confidentiality, expose him to the stigma of a public hearing. We cannot help but conclude that the forcefully committed civil patient has at stake interests of equivalent proportions.”
To summarize, Specht teaches us that “whether denominated civil or criminal,” sexual psychopath proceedings are subject to the “full panoply” of the protections of the due process clause, and an adverse determination in such proceedings is “a new finding of fact”; in turn, Winship instructs that the due process clause requires proof beyond a reasonable doubt not only of the guilt of a defendant in a traditional criminal prosecution but also of the dispositive fact or facts in any proceeding in which the state threatens to deprive an individual of his “good name and freedom.” The two decisions, handed down less than three years apart, thus complement each other and point to the proper resolution of the case at bar: under Specht, this defendant is entitled to all the safeguards of due process of law, and under Winship those [325]*325safeguards must include the standard of proof beyond a reasonable doubt.15
III
The contrary arguments of the People are not persuasive. Running throughout the People’s position is the view that the standard of proof beyond a reasonable doubt is not required because mentally disordered sex offender proceedings are “predictive in nature”: i.e., inasmuch as the state is not trying to prove that the defendant committed a particular illegal act in the past but rather is “predisposed” to commit sex crimes in the future, fewer safeguards against factual error are required. The facile attractiveness of this theory, however, masks the weakness of its underlying assumption. The assumption is that predictive judgments are truly valid, and that the probability of error in such judgments is significantly less than the probability of error in judgments determining that specific past events occurred. As sometimes happens to our most cherished preconceptions, reality is otherwise.
In the light of recent studies it is no longer heresy to question the reliability of psychiatric predictions. Psychiatrists themselves would be [326]*326the first to admit that however desirable an infallible crystal ball might be, it is not among the tools of their profession. It must be conceded that psychiatrists still experience considerable difficulty in confidently and accurately diagnosing mental illness.16 Yet those difficulties are multiplied manyfold when psychiatrists venture from diagnosis to prognosis and undertake to predict the consequences of such illness: “ ‘A diagnosis of mental illness tells us 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 which 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.’ ” (Murel v. Baltimore City Criminal Court (1972) supra, 407 U.S. 355, 364-365, fn. 2 [32 L.Ed.2d 791, 796-797] (Douglas, J., dissenting from dismissal of certiorari).)17
[327]*327During the past several years further empirical studies have trans-— formed the earlier trend of opinion into an impressive unanimity: “The evidence, as well as the consensus of opinion by responsible scientific authorities, is now unequivocal.” (Diamond, The Psychiatric Prediction of Dangerousness (1975) 123 U.Pa. L.Rev. 439, 451.) In the words of spokesmen for the psychiatric profession itself, “Unfortunately, this is the státe of the art. Neither psychiatrists nor anyone else have reliably demonstrated an ability to predict future violence or ‘dangerousness.’ Neither has any special psychiatric ‘expertise’ in this area been established.” (Task Force Report, Clinical Aspects of the Violent Individual (American Psychiatric Assn., 1974) p. 28.) And the same studies which proved the inaccuracy of psychiatric predictions have demonstrated beyond dispute the no less disturbing manner in which such prophecies consistently err: they predict acts of violence which will not in fact take place (“false positives”), thus branding as “dangerous” many persons who are in reality totally harmless. (See generally id. at pp. 23-30.)
We need not lengthen this opinion by setting forth the various reasons for these limitations on the present-day practice of psychiatry; they are fully discussed in the literature.18 Nor do we go so far as to join in the [328]*328conclusion of certain well-known writers that in civil commitment proceedings no psychiatrists should be permitted to give their opinions as to future dangerousness and that any commitment based on such an opinion constitutes a deprivation of liberty without due process of law. 19
For our present purposes it is enough to hold that the requirement of proof beyond a reasonable doubt in mentally disordered sex offender proceedings is not negated by the “predictive” content of the ultimate finding. If anything, that aspect of the judgment reinforces our determination to require a high standard of proof on this issue: as a federal circuit court explained in a related context, “the inherently speculative nature of psychiatric predictions, resulting in confinement not for what one has done but for what one will do, demands more than minimal procedures, particularly when such confinement is accomplished outside the traditional criminal process, with its right to jury trial and other ancient safeguards.” (Sarzen v. Gaughan (1st Cir. 1973) supra, 489 F.2d 1076, 1086.)20
[329]*329The People, next emphasize that mentally disordered sex offender proceedings presuppose a valid criminal conviction as a prerequisite to jurisdiction (In re Bevill (1968) supra, 68 Cal.2d 854), and that in each case, as here, such conviction was necessarily proved beyond a reasonable doubt. If the People mean that a person found to be a mentally disordered sex offender has had one bite of the “beyond a reasonable doubt” apple and should not be so greedy as to expect another, their point is refuted by the code itself.
The crime of which the defendant was found guilty need have no connection with sex at all: the statute explicitly states that mentally disordered sex offender proceedings may be instituted “When a person is convicted of any criminal offense, whether or not a sex offense” (§ 6302, subd. (a)). Manifestly, a charge of robbery or burglary or grand theft does not even put in issue any of the elements of the statutory definition of a mentally disordered sex offender. (§ 6300, fn.T, ante.) Even in those cases in which the conviction was of a sex offense, the issues adjudicated in the criminal trial remain fundamentally different from those in the mentally disordered sex offender proceeding: in the former trial the questions for the jury are whether a specific sexual act violative of a statutory prohibition was committed, and if so, whether the defendant in fact committed that act with the requisite intent. (See Pen. Code, § 20.) But a single instance of sexual misconduct does not establish that the defendant is afflicted with “mental disease,” nor that he is dangerously “predisposed” to repeat such offenses in the future. Even forcible rape, perhaps the most serious of sex crimes, is often wholly situational and takes place only because of a fortuitous concatenation of circumstances [330]*330not likely to recur. Accordingly, the fact that the issues at the criminal trial were judged by the reasonable doubt standard has no bearing on how the distinct issues at the mentally disordered sex offender proceeding must be proved.
The People also assert that proof by a preponderance of the evidence is sufficient in mentally disordered sex offender proceedings “because the jury is in reality asked to confirm what is essentially a psychiatric diagnosis.” This is a dismaying claim indeed. Surely we have not gone so far towards 1984 and Orwell’s bleak prospect of “government by experts” that in a proceeding in which human liberty is at stake the function of our juries is reduced to “confirming” the guesses of doctors hired by the state. A man facing indefinite confinement in a maximum security state mental institution because of what he is allegedly predisposed to do is entitled to a jury which impartially weighs the evidence, appraises with an open mind the credibility and persuasiveness of all the witnesses, and reaches its own independent judgment on the issues submitted to it. Anything less would make a mockery of the entire proceeding. As a recent commentator astutely observed, “If the purpose of the jury safeguard presently afforded by the MDSO statute is nothing more than to rubber-stamp the psychiatric opinion presented, the safeguard is now a meaningless sham and the burden of proof irrelevant, since nothing is proved.” (Italics added; fn. omitted.) (Note, Toward a Less Benevolent Despotism: The Case for Abolition of California’s MDSO Laws (1973) 13 Santa Clara Law. 579, 606.)
Nor is there any reason why, as the People further contend, the state’s burden of proof should be no greater than “the degree of assurance with which reputable psychiatrists express themselves.” Psychiatrists—or any other witnesses, for that matter—are entitled to express themselves in court with any “degree of assurance” they please. The law is not concerned with how firmly they believe what they are saying, because they are not the ultimate arbiters of the defendant’s fate. That awesome responsibility rests on the jury, and it cannot be evaded; however tentative the testimony of the witnesses may be, the jury is bound by oath to reach a decision or make every effort to do so. It is therefore the degree of assurance in the jurors’ minds which matters. Of course, hesitant or conflicting testimony may well put the jury in doubt as to where the truth lies. But difficult as the jury’s task may be in that event, the effect of an erroneous decision on the defendant is immeasurably greater. The law, in short, does not weaken the standard of proof merely because the evidence is weak.
[331]*331No special exception from this principle is justified for psychiatrists. It is true we have held that medical witnesses, like any other experts, need not limit their testimony in criminal trials to matters on which they have opinions “beyond a reasonable doubt.” (People v. Phillips (1966) 64 Cal.2d 574, 579, fn. 2 [51 Cal.Rptr. 225, 414 P.2d 353].) But it does not follow that the jury weighing that testimony is relieved of its higher duty. As we explained in Phillips (ibid.), “We do not believe that the questions answered [by a physician witness] as to the effect of the surgery should have been framed in the terminology of ‘beyond a reasonable doubt,’ which expresses the ultimate issue for the determination of the jury.” (Italics added.)
Other examples of this joint operation of two different standards abound. Perhaps the most relevant is the defense of diminished capacity in murder trials. The assertion of such a defense typically results in psychiatrists’ testifying both for and against the defendant on the crucial issue of whether at the time of the killing he lacked the necessary mental capacity to be guilty of murder in the first degree. On that issue the witnesses may properly speak with no more than “the degree of assurance with which reputable psychiatrists express themselves.” But when the case is submitted to the jury that body is nevertheless required to determine the defendant’s guilt of first degree murder beyond a reasonable doubt, even though the determination may turn on tentative or conflicting opinions of the medical experts. (See, e.g., People v. Bassett (1968) 69 Cal.2d 122, 139-140 [70 Cal.Rptr. 193, 443 P.2d 777], and cases cited.) The same rule applies in the case at bar.21
[332]*332IV .
For the foregoing reasons we hold that the standard of proof beyond a reasonable doubt is required in mentally disordered sex offender proceedings by the due process clauses of article I, section 7, subdivision (a), of the California Constitution and the Fourteenth Amendment to the United States Constitution. Although the present case challenges an order of commitment made after a trial of the issue pursuant to section 6321, the same rule manifestly applies to any stage of the proceedings in which the person is committed or recommitted to the State Department of Health pursuant to a finding that he is a mentally disordered sex offender (e.g., §§ 6316, 6326, 6327). And because the major purpose of this rule is to overcome an aspect of those proceedings which “substantially impairs the truth-finding function,” our decision today must be given complete retroactive effect. (Ivan V v. City of New York (1972) 407 U.S. 203, 205 [32 L.Ed.2d 659, 661, 92 S.Ct. 1951] (holding Winship fully retroactive).)
In view of our disposition herein, it is unnecessary to reach Burnick’s additional contentions.
The order appealed from is reversed.
Wright, C. J., Tobriner, J., and Sullivan, J., concurred.