Opinion
NEWMAN, J.Glenn Hofferber appeals from a 1978 judgment and order establishing a civil conservatorship under the Lanterman-PetrisShort (LPS) Act. (Welf. & Inst. Code, §§ 5000 et seq., 5350 et seq. Subsequent statutory references are to the Welfare and Institutions Code unless otherwise indicated.)
The conservatorship is based on findings that appellant is “gravely disabled” because he is an incompetent defendant charged with a violent felony. (§ 5008, subd. (h)(2).) We conclude that the judgment and order must be reversed.
After a September 1974 preliminary hearing appellant was charged with murder. In November 1974 he was found mentally incompetent to stand trial and was committed to the Department of Health for place*166ment in a state hospital (Pen. Code, § 1368 et seq.). There he was entitled to periodic six-month review of his competence (id., § 1370, subd. (b)(1)).
In 1976 he was returned to the criminal court for the required 18-month hearing (§ 1370, subd. (b)(2)). Again he was found incompetent to stand trial and was recommitted to the state hospital.
In October 1977, because he had been confined for the maximum three-year period permitted by section 1370, subdivision (c)(1) and the Department of Health determined there was no substantial likelihood he would regain mental competence in the foreseeable future (§ 1370, subd. (b)(1)), again he was returned to the criminal court (§ 1370, subd. (c)(2)). In December 1977 a unanimous jury by a preponderance of the evidence found him incompetent to stand trial. Thereafter Judge Chernow, noting that appellant had been the subject of an earlier conservatorship which had terminated prior to the alleged murder, had admitted the killing (“I just let him have it”),1 and had announced his aim to drive a stake through the heart of a relative, concluded that (1) he was incompetent to stand trial and “would constitute a danger to the safety of others if he were free of secure custody,” and (2) he appeared to be “gravely disabled” within the meaning of section 5008, subdivision (h)(2). Accordingly, Judge Chernow directed the public guardian to initiate civil conservatorship proceedings under the LPS Act. (Pen. Code, § 1370, subd. (c)(2).)
In the conservatorship proceedings Judge Ziskrout denied appellant’s request for a second jury trial on the issue of mental competence and, at the guardian’s request, took judicial notice of the December 1977 *167competence hearing. On March 6, 1978, Judge Ziskrout found appellant “gravely disabled.” The guardian was appointed conservator of appellant’s person and estate and was authorized to place him in a state hospital or other mental health facility. (§§ 5350, 5358.)
Appellant asserts that (1) a person charged with a violent felony and found mentally incompetent to stand trial may not be civilly committed for reasons and under procedures that differ from those applicable to other mentally disordered persons, (2) to establish grave disability his incompetency must be proved beyond a reasonable doubt, and (3) his conservatorship violates the proscription of retroactive or ex post facto laws. We examine each contention separately.2
Validity of Commitment Standards
Before 1974, California law provided that persons charged with criminal conduct but found incompetent to stand trial were committed to state hospitals until they became “sane” (i.e., competent). Because attainment of competence was the sole standard for release the commitments were indefinite, even permanent, so long as incompetence persisted. (Former Pen. Code, §§ 1368-1370; see Parker, California's New Scheme for the Commitment of Individuals Found Incompetent to Stand Trial (1975) 6 Pacific L.J. 484, 486.)
In Jackson v. Indiana (1972) 406 U.S. 715 [32 L.Ed.2d 435, 92 S.Ct. 1845] the Supreme Court struck down similar provisions on grounds that they denied equal protection and due process. The equal protection ruling arose from the premise that persons could not, solely because of pending criminal charges against them, be subject to commitment standards more lenient or release standards more stringent than those applicable to persons not charged with criminal offense.
*168Under Indiana law, other mentally disordered persons could be committed and involuntarily confined only if dangerous or in need of custodial care or treatment. Mentally disordered criminal defendants, however, were committed and confined solely on the basis of inability to assist at trial. Their confinement continued as long as that condition persisted, regardless of whether confinement was necessary for treatment or for their or others’ protection. Since pendency of unproved criminal charges was not a reasonable basis for distinction among mentally ill persons, Jackson reasoned, Indiana law denied incompetent criminal defendants equal protection. (P. 730 [32 L.Ed.2d p. 446].)
Jackson held that the procedures also denied due process because, solely for incompetence, they permitted confinement beyond a period “reasonably related” to the aims of commitment. The court reasoned as follows: Commitment solely for incompetence is intended to permit treatment to alleviate that condition. Hence, confinement on that ground may not continue beyond the time reasonably necessary to determine whether the purpose of treatment is being served.
Once there appears no substantial likelihood that defendant will regain competence, Jackson concluded, the state must justify further confinement by showing that it is necessary on some ground applicable to all mentally ill persons, such as dangerousness or need for custodial care. The court adopted a “rule of reason” that, once hopeless incompetence appears, “the State must either institute the customary civil commitment proceeding that would be required to commit indefinitely any other citizen, or release the defendant.” (P. 738 [32 L.Ed.2d p. 451]; cf. Greenwood v. United States (1956) 350 U.S. 366, 373-374 [100 L.Ed. 412, 418, 76 S.Ct. 410].)
Following Jackson, this court invalidated indefinite commitments under California procedures for confinement of incompetent criminal defendants. (In re Davis (1973) 8 Cal.3d 798, 805-806 [106 Cal.Rptr. 178, 505 P.2d 1018], cert. den. sub nom. Palma v. California, 414 U.S. 870 [38 L.Ed.2d 88, 94 S.Ct. 87].) Davis held that, once defendant’s progress toward competence became unlikely, “the court should either order him released from confinement or initiate appropriate alternative commitment proceedings under the [EPS] Act....” (Id., at p. 807.)3 *169When Davis was decided those proceedings included (1) annually renewable conservatorships for “gravely disabled” persons—those mentally unable to provide their “basic personal needs for food, clothing, or shelter.. .” (§§ 5008, subd. (h)(1), 5350 et seq.), and (2) 90-day maximum confinements for “imminently dangerous” persons, renewable only for violence while confined. (§ 5304.)
Adapting the LPS Act language in Davis, the Legislature in 1974 amended the statutes to bring California’s scheme for confinement of incompetent criminal defendants within constitutional bounds. (Stats. 1974, ch. 1511, p. 3316 et seq.) Under current law a defendant confined for incompetence who has not regained competence must be returned to the superior court after (1) three years, or (2) the maximum term of imprisonment for the most serious underlying offense, whichever is shorter (Pen. Code, § 1370, subd. (c)(1)), or whenever the superintendent of the treatment facility sooner determines there is no substantial likelihood the defendant will attain competence (§ 1370, subd. (b)(1)).4 The court then must redetermine competence. If defendant is competent, criminal proceedings are resumed. If not the court must either *170release him or order that “gravely disabled” conservatorship proceedings be instituted under the LPS Act (§ 1370, subd. (c)(2)).5
The Legislature also amended section 5008, subdivision (h), which defines grave disability. The revised section retains the traditional concept of helplessness (subd. (h)(1)) but adds an alternative definition based on criminal incompetence. A person now may be found “gravely disabled” on grounds that he (1) is charged by indictment or information with a felony involving death, great bodily harm, or a serious threat to the physical well-being of another, and (2) is incompetent to assist in his defense because of a mental disorder.6 His conservatorship may be renewed annually so long as those conditions persist.
Appellant argues that the new scheme is a transparent and unsuccessful evasion of Jackson and Davis. Despite the law’s attempt to make incompetents committable under the “customary” civil commitment law, he suggests, it still denies them equal protection because their incompetence bears no rational relationship to the “grave disability” *171provisions of the LPS Act. Jackson and Davis, he urges, make unproved criminal charges and a subsequent finding of incompetence insufficient grounds for any distinction, procedural or substantive, from other persons subject to civil commitment. Since he has been found hopelessly incompetent, he contends, he may now be civilly committed only under LPS Act provisions not dealing with criminal incompetence.
He also asserts that the new scheme denies due process because it allows indefinite commitment of hopeless incompetents on that ground alone, without any new showing that they are dangerous, helpless, or otherwise in need of further confinement. Therefore, he concludes, he must be released unless his confinement can be justified under laws articulating one or more of those grounds.
The conservator responds that the new commitment procedures do meet constitutional standards because they follow a determination of probable cause to believe defendant committed a violent felony. (See Pen. Code, § 1368.1, subd. (a); § 5008, subd. (h)(2); Hale v. Superior Court (1975) 15 Cal.3d 221, 226-228 [124 Cal.Rptr. 57, 539 P.2d 817].)7 Separate treatment and indefinite confinement of such a defendant, he contends, are justified on grounds of public safety because the probable criminal conduct evidences extraordinary dangerousness.8
We agree that the rulings of Jackson and Davis are not satisfied by placing arbitrary and discriminatory confinement standards for criminal incompetents in the civil commitment statutes. However, we do not regard those cases as holding that the fact of criminal incompetency may never be a basis for involuntary confinement prescriptions.
The state has compelling interests in public safety and in humane treatment of the mentally disturbed. (Cf. Turnbull, Law and the *172Mentally Retarded Citizen: American Responses to the Declarations of Rights of the United Nations and International League of Societies for the Mentally Handicapped—Where We Have Been, Are, and Are Headed (1979) 30 Syracuse L.Rev. 1093.)9 It may adopt more than one procedure for isolating, treating, and restraining dangerous persons; and differences will be upheld if justified. (Baxstrom v. Herold (1966) 383 U.S. 107, 111 [15 L.Ed.2d 620, 623-624, 86 S.Ct. 760]; In re Gary W., supra, 5 Cal. 3d 296, 304.) Variation of the length and conditions of confinement, depending on degrees of danger reasonably perceived as to special classes of persons, is a valid exercise of state power.
California laws have long followed that premise. For certain purposes they properly classify, separately, those mentally ill persons against whom a judicial determination of criminal conduct has been made since such persons, at least initially, have demonstrated particular danger. (See In re Moye, supra, 22 Cal.3d 457, 462; In re Franklin (1972) 7 Cal.3d 126, 146 [101 Cal.Rptr. 553, 496 P.2d 465].)
The California scheme permits long-term, renewable commitments of persons found not guilty by reason of insanity (Pen. Code, § 1026 et seq.), mentally disordered sex offenders (MDSO’s) (§ 6300 et seq.), and those committed to the Youth Authority (§ 1800 et seq.; People v. Smith (1971) 5 Cal.3d 313, 317 [96 Cal.Rptr. 13, 486 P.2d 1213])—in each case on proof that they remain dangerously disturbed. On the other hand, violent persons not adjudicated under the criminal justice system are subject only to the short-term LPS Act procedure for “imminently dangerous” persons. They, unlike those criminally committed, may not be confined indefinitely on psychiatric opinion alone. (§§ 5300, 5304.)
Those distinctions have two apparent bases. First, the Legislature apparently concluded that short-term civil confinement is preferable for *173most violent incidents caused by mental disturbance and that only seriously dangerous persons should be subject to the trauma and stigma of longer-term confinement. (Parker, supra, 6 Pacific L.J. at pp. 501-502.) On the other hand, it was considered that acts serious enough for criminal treatment justify a continuing special interest in a person’s nonpenal confinement for purposes of public safety. (See In re Moye, supra, 22 Cal.3d at p. 462; In re Franklin, supra, 7 Cal.3d at pp. 145-146; In re Gary W., supra, 5 Cal.3d 296, 304.) Weighing the compelling interest in avoiding confinement whenever possible against the equal need to protect society from the seriously dangerous mentally ill, the Legislature has naturally concluded that statutory distinctions must be made on the basis of degree of danger presented.10
For the same reasons, some separate treatment of permanently incompetent criminal defendants formally charged with violent felonies is justified. Allegedly they have engaged in violence so critical that serious criminal charges were believed appropriate. Magistrates or grand juries have found substantial evidence that the alleged conduct actually was committed as alleged. Those determinations of probable cause establish strong grounds to believe that, by concrete acts, the incompetent defendants already have seriously imperiled public safety and thus are particularly dangerous. Yet because of permanent incompetence they *174cannot be evaluated and confined for continuing dangerousness under the criminal processes usually applied to serious violent conduct.11
We do not gainsay society’s interest in protection against violent, incompetent, criminal defendants. As with those finally adjudicated to be criminally disordered on the basis of prior conduct, that interest continues so long as continuing dangerousness can be shown. (Compare Moye, supra, 22 Cal. 3d at p. 462; Franklin, supra, 7 Cal.3d at pp. 145-146.)12 The Legislature therefore may provide for the confinement of those persons, on grounds of violent dangerousness, under a scheme different from traditional, short-term, civil commitment.13 An LPS conservatorship, with its multiple procedural safeguards and emphasis on treatment (see § 5352.6), is a proper means to achieve that end.
Accordingly we conclude that under a separate statutory scheme the state may confine incompetent criminal defendants, on grounds that they remain violently dangerous, when a magistrate or grand jury has found probable cause to believe that they have committed violent felonies.
The statutes, however, do not expressly require a showing of continuing dangerousness. They appear to permit indefinite maintenance of *175LPS conservatorships solely because the incompetence continues and the violent felony charges have not been dismissed. (§ 5008, subd. (h)(2).) Thus, so that Jackson and Davis may be respected, the conservator requests that we read a “dangerousness” requirement into the new LPS Act provisions. In Franklin, analogously, we ruled that “restoration to sanity,” the standard for release of criminally insane persons (Pen. Code, § 1026.2, former § 1026a), was satisfied when they no longer represented a danger to health and safety. (7 Cal. 3d at p. 145.)14
If feasible within bounds set by their words and purpose, statutes should be construed to preserve their constitutionality. (Pryor v. Municipal Court (1979) 25 Cal.3d 238, 253-254 [158 Cal.Rptr. 330, 599 P.2d 636]; In re Edgar M. (1975) 14 Cal.3d 727, 736-737 [122 Cal.Rptr. 574, 537 P.2d 406].) Clearly the Legislature’s focus on violent felony charges reflects a concern as to dangerousness in criminal incompetency cases similar to that previously evidenced in the criminal insanity provisions. Appellant rejects that inference and argues that the Legislature in 1974 intended to preclude dangerousness as a basis for confinement. The history he provides, though, contradicts his contention.
In 1973 hearings on the Jackson-Davis problem (Assem. Select Com. on Mentally Disordered Criminal Offenders, Dec. 13-14, 1973) legislators, health professionals, and the Attorney General’s representative contended that incompetents charged with violent felonies warranted special treatment precisely because their past conduct implied future danger. Participants in the hearings also feared that many of those persons, while delusional and potentially violent if released, would “slip through the cracks” if they neither behaved violently in short-term confinement (a requirement for renewal of 90-day “imminent threat” commitments under the LPS Act) nor could be proved unable to care for themselves (necessary for a traditional LPS Act “gravely disabled” conservatorship).
*176Appellant also argues that we may not prescribe a dangerousness requirement since we cannot identify which of the several “danger” definitions appearing in California statutes the Legislature itself would apply to criminal incompetents. (See, e.g., § 1800 [extended commitment of Youth Authority inmate “physically dangerous to the public” because of “mental or physical deficiency, disorder, or abnormality”]; § 5304 [90-day civil commitment of one who has attempted or inflicted physical harm “and who, as a result of mental disorder, presents an imminent threat of substantial physical harm to others”]; § 6300 [MDSO defined as one whose “mental defect, disease, or disorder” predisposes him to sexual offense “to such a degree that he is dangerous to the health and safety of others”]; § 6316.2 [extended commitment of MDSO whose mentally disordered propensity for sex offenses presents a “substantial danger of bodily harm to others”]; § 6500 [commitment of mentally retarded person who is a “danger to himself or others”]. Italics added; see also Pen. Code, § 1026.5, subdivision (b)(1) (fn. 14, ante).)
The distinctions among those definitions appear more form than substance. To the extent the words do differ materially we have little difficulty in choosing an appropriate standard. As with the criminally insane, the Legislature was concerned here about persons whose seriously dangerous propensities had apparently already surfaced in violent conduct of felonious magnitude and whose mental conditions created a substantial possibility that they might commit further violence if freed from extended supervision, confinement, and treatment.
The criminal insanity provisions thus seem to be the most closely analogous, and the Legislature recently has clarified the degree of “dangerousness” that in such cases justifies extended commitment. We conclude that we can best accommodate both the Constitution and the legislative intent by adapting that standard to the LPS Act provisions for criminal incompetence. (Cf. In re Moye, supra, 22 Cal.3d at p. 467; In re Edgar M., supra, 14 Cal.3d at pp. 736-737.)
We therefore hold that every judgment creating or renewing a conservatorship for an incompetent criminal defendant under section 5008, subdivision (h)(2) must reflect written findings that, by reason of a mental disease, defect, or disorder, the person represents a substantial *177danger of physical harm to others. (See Pen. Code, § 1026.5, subd. (b)(1).)15 We uphold the 1974 amendments as so construed.
The conservator suggests that the requisite finding here is implicit in the initial probable cause determination of violent felonious conduct and that no supplementary finding or evidence is necessary. We disagree. We have indicated that the initial determination of probable cause, coupled with the defendant’s continuing incompetence, permits separate legislative concern and treatment. For several reasons, however, it cannot give rise to a permanent, conclusive presumption of continuing dangerousness.
First, the homicide alleged here took place in 1974; and no court ever has found beyond a reasonable doubt that appellant committed it. Nor has there been a determination that either the criminal act or any current dangerousness is the product of a mental disease, defect, or disorder. Even if he had a dangerous mental condition in 1974 the passage of time by itself diminishes the validity of an assumption that his dangerousness continues unabated.
Second, a conclusive presumption of current dangerousness would deny equal protection. The criminally insane—against whom findings of criminal conduct produced by a mental condition have been made—are conclusively presumed dangerous only until completion of trial and the subsequent, automatic, 90-day commitment for observation of their current mental conditions. (Pen. Code, §§ 1026, subd. (a), 1026.2.) Thereafter, whenever they are no longer dangerous they must be released. (Id., §§ 1026.2, 1026.5; Franklin, supra, 7 Cal.3d at p. 145.) No rational basis appears for conclusively presuming an unconvicted, incompetent defendant dangerous for a longer period than one found criminally insane.
Third, at the time of his 1978 conservatorship hearing appellant already had been confined in a hospital for the three-year treatment period provided by the Penal Code. Psychiatric impressions gained during such a period of observation obviously are relevant and important means of determining whether a person once violent remains so. A con-*178elusive presumption of continuing dangerousness would be arbitrary if extended beyond the period reasonably necessary for hospital evaluation of a defendant’s current propensity for violence. Under the existing scheme for incompetent criminal defendants, ample opportunity for evaluation exists during their confinement under the Penal Code. (Cf. Jackson, supra, 406 U.S. at p. 738 [32 L.Ed.2d at pp. 450-451]; Davis, supra, 8 Cal.3d at pp. 806-807.)
Accordingly, an LPS Act determination that an incompetent criminal defendant is “gravely disabled” because he is currently dangerous as the result of a mental disease, defect, or disorder must follow a hearing addressed to that specific issue. (See Jackson, supra, 406 U.S. at pp. 737-738 [32 L.Ed.2d at p. 450]; Humphrey, supra, 405 U.S. at p. 511 [31 L.Ed.2d at pp. 403-404].) Since appellant apparently had no such hearing he was denied equal protection and due process. The conservatorship order thus must be reversed.16
Standard of Proof and Jury Trial
Appellant further contends that his grave disability for LPS Act purposes must be established beyond a reasonable doubt and that he was entitled to a unanimous jury verdict on that issue. We agree that in any subsequent trial under section 5008, subdivision (h)(2) appellant’s dangerous mental condition must be found beyond a reasonable doubt and, if appellant insists, by a unanimous jury. The law does not, though, require an equally stringent showing of incompetence.
Involuntary confinement for mental illness or dangerousness, whether civil or criminal, involves loss of liberty and substantial stigma. Fact-finding error must be minimized when such drastic consequences are at stake. Hence, the facts that trigger confinement must generally be proved to a unanimous jury beyond a reasonable doubt. (Conservator-ship of Roulet (1979) 23 Cal.3d 219, 229-230, 232-233 [152 Cal.Rptr. 425, 590 P.2d 1] [traditional “gravely disabled” conservatorship]; Peo*179ple v. Thomas (1977) 19 Cal.3d 630, 633 [139 Cal.Rptr. 594, 566 P.2d 228]" [narcotics addict]; People v. Feagley (1975) 14 Cal.3d 338, 349-358 [121 Cal.Rptr. 509, 535 P.2d 373] [MDSO—unanimous jury]; People v. Burnick (1975) 14 Cal.3d 306, 322 [121 Cal.Rptr. 488, 535 P.2d 352] [MDSO—reasonable doubt standard]; but cf. In re Roger S. (1977) 19 Cal.3d 921, 938-939 [141 Cal.Rptr. 298, 569 P.2d 1286] [parental commitment of minor—no judicial hearing or jury trial].) Since a dangerous mental condition is the sole basis on which continued confinement of a permanent incompetent can be justified under the new “gravely disabled” provisions, that fact must be established under strictest standards.17
We do not, however, reach a parallel conclusion on the requirement of continuing incompetence. So long as a defendant is adjudged incompetent by a preponderance of evidence, the criminal trial and disposition of the charged offenses are impossible. (Pen. Code, §§ 1369, 1370.) It is the preponderant judgment of incompetence that removes defendant from the criminal justice system and creates the need for non-penal protection against his continuing dangerousness. It would be anomalous if indefinitely he could avoid penal treatment by consecutive, preponderant judgments that he was incompetent and then, though dangerous, also avoid LPS Act confinement as a “gravely disabled” person because incompetence could not be established beyond a reasonable doubt. (Cf. In re Franklin, supra, 7 Cal.3d at pp. 146-147.)
A preponderance standard for LPS Act incompetency will not increase the risk of error in determining material issues. It is the fact of a prior incompetence finding and the legal effect of that finding, rather than incompetence itself, that form the bases for civil commitment. No purpose seems served by requiring a more stringent proof of the underlying condition in order to establish an LPS Act conservatorship.
We hold therefore that incompetence for purposes of section 5008, subdivision (h)(2) may be established by a preponderance of evidence. If initial conservatorship proceedings follow within a reasonable time after defendant has been found incompetent in criminal court, the con*180servatorship adjudicators may by judicial notice rely on the prior finding. Any renewal of the conservatorship must, of course, be based on updated evidence of the conservatee’s incompetence.
Validity of Applying 1974 Amendments to Prior Homicide
Finally appellant argues that to apply the 1974 amendments to him would violate constitutional limitations on retroactive and ex post facto laws, since the alleged homicide occurred before the amendments became effective. We do not agree.
The ex post facto clauses (U.S. Const., art. I, § 9, cl. 3; Cal. Const., art. I, § 9) apply only to penal statutes. They prohibit retrospective laws that (1) impose criminal liability for conduct innocent when it occurred, (2) increase the punishment prescribed for a crime at the time it was committed, or (3) by necessary operation and ‘“in [their] relation to the offense, or [their] consequences, alter the situation of the accused to his disadvantage. . . .”’ (People v. Ward (1958) 50 Cal.2d 702, 707 [328 P.2d 777], cert. den. (1959) 359 U.S. 945 [3 L.Ed.2d 678, 79 S.Ct. 730], disapproved on other grounds, People v. Morse (1964) 60 Cal.2d 631, 649 [36 Cal.Rptr. 201, 388 P.2d 33, 12 A.L.R.3d 810]; Thompson v. Utah (1898) 170 U.S. 343, 351 [42 L.Ed. 1061, 1066-1067, 18 S.Ct. 620]; and see Medley, Petitioner (1890) 134 U.S. 160, 171 [33 L.Ed. 835, 840, 10 S.Ct. 384]; In re Dewing (1977) 19 Cal.3d 54, 57 [136 Cal.Rptr. 708, 560 P.2d 375].)
Appellant argues that the 1974 amendments did increase the punishment for the earlier homicide. He relies principally on In re Valenzuela (1969) 275 Cal.App.2d 483 [79 Cal.Rptr. 760]. There a minor had been committed without jury trial to the Youth Authority for a 1960 sex offense. Under statutes then in effect, that “criminal” commitment would have expired when the minor turned 21 in 1966. In 1963, however, the Legislature amended the Welfare and Institutions Code to permit potentially unlimited two-year extensions of confinement for Youth Authority inmates deemed presently dangerous because of physical or mental deficiency. (§§ 1800, 1802.) No jury trial was provided on dangerousness.
The Valenzuela court rejected contentions that the new confinement provisions were not penal. It stressed that the aim of the new statute was protection of society and not rehabilitation, that defendant was confined at Deuel, a maximum security institution, and that he could be *181transferred to state prison if necessary. The 1963 legislation, it said, “viewed as a system,” was therefore penal rather than civil. (P. 487.)
The court also rejected arguments that the 1963 legislation was not ex post facto because it focused on current dangerousness rather than antecedent criminal conduct. But for the 1960 criminal commitment and the incarceration it produced, said the court, defendant in 1966 could only have been confined under civil statutes providing greater procedural protections, including jury trial. (Ibid.; see § 5000 et seq.)
Appellant here argues that, when the homicide with which he is charged occurred, California statutes—as limited by Jackson and Davis—permitted confinement of criminal incompetents only for treatment or under then-existing civil commitment laws applicable to all other persons. They prescribed indefinite commitment only for helplessness, and sharply limited confinement for dangerousness. (§§ 5300 et seq., 5350 et seq.) The 1974 amendments, however, subjected him to indefinite confinement for incompetence, regardless of whether he was helpless. As in Valenzuela, he urges, the potential for increased confinement, even if based on present incompetence or dangerousness, arose only because of the pre-amendment homicide. Therefore, he reasons, his “punishment” for that “criminal conduct” has been increased ex post facto.
Mr. Valenzuela’s exposure to extended confinement, however, arose directly from his commitment to a penal institution, for a criminal offense. By extending, after the fact, the length of time he could be incarcerated as a result of his criminal commitment the Legislature effectively increased his potential punishment after the crime had taken place.
The 1974 LPS Act provisions, by contrast, have nothing to do with any punitive disability attached to the homicide charged against appellant at the time it occurred. They did not alter or affect the sentence for that crime. They did not extend, directly or indirectly, any incarceration that had been or could be imposed on appellant for criminal conduct. Indeed, because of appellant’s potentially permanent incompetence, a criminal sentence or confinement probably will never be imposed. Unlike Mr. Valenzuela’s, appellant’s confinement arose not from criminal conduct but from his mental condition. He does not face incarceration *182in a prison but must be placed in a state hospital or some other less restrictive setting. (§ 5358.)18
We conclude that the 1974 provisions, “viewed as a system,” are not penal for purposes of the ex post facto clauses and do not impose punishment for crime, in letter or in spirit. Valenzuela’s holding that the increased confinement there was unconstitutional because triggered by pre-amendment criminal conduct must be read in the context of procedures that actually extended a period of commitment for criminal conduct. We do not interpret Valenzuela to mean that all laws which civilly confine dangerous persons for the protection of society are subject to the ex post facto clauses.
Nor did the 1974 provisions “disadvantage” appellant as an “accused.” That branch of ex post facto doctrine relates to circumstances under which a criminal defendant is forced to defend against a verdict of criminal guilt. (Ward, supra, 50 Cal.2d at p. 707.) Here no criminal adjudication is involved, and we find no ex post facto violation.
Did the 1974 amendments nonetheless operate against appellant with illegal retroactivity? (See In re Marriage of Bouquet (1976) 16 Cal.3d 583 [128 Cal.Rptr. 427, 546 P.2d 1371].) We think not.
Whether the new statutes have been applied retroactively depends on how they are characterized. If viewed as changing the legal consequences of homicide committed before their effective date they might be deemed retroactive as to appellant. Statutes that focus on a continuing dangerous condition, though, are not retroactive simply because they employ pre-statute conduct as evidence of the ongoing dangerousness. (See DiGenova v. State Board of Education (1962) 57 Cal.2d 167, 177-178 [18 Cal.Rptr. 369, 367 P.2d 865], and dis. opn. of Schauer, J. at pp. 181-185; cf. Eichelberger v. City of Berkeley (1956) 46 Cal.2d 182, 189 [293 P.2d 1]; Record v. Indemnity Ins. Co. (1951) 103 Cal.App.2d 434, 444 [229 P.2d 851].)
We need not decide whether the 1974 amendments are being applied retroactively to petitioner. However characterized, we think the Legislature intended them to apply, once effective, to all criminal incompetents *183who are a continuing public danger, whether the violent felony charges by which such persons are initially identified in the amendments occurred before or after the statutes took effect.
The Legislature enacted the 1974 amendments as emergency measures, explicitly intended to fill the gap left by Davis in California’s commitment scheme. Speedy implementation was declared necessary “for the immediate preservation of the public peace, health, or safety” and to eliminate uncertainty about proper court procedures. (Stats. 1974, ch. 1511, supra, § 16, pp. 3323-3324.)
We have held that a legislative attempt to cure an unconstitutional statute may suggest an intent that the curative provision be applied retroactively. (In re Marriage of Bouquet, supra, 16 Cal.3d at p. 588; cf. People v. Teron (1979) 23 Cal.3d 103, 118, fn. 9 [151 Cal.Rptr. 633, 588 P.2d 773].19) Moreover, the 1974 amendments seek to protect against a particular class of potentially dangerous persons. In such cases, legislative expressions of urgency in the interest of public safety necessarily indicate an attempt to reach all persons in the class who represent the continuing danger even if they fall within the legislative purview partly by reason of prior conduct. (DiGenova, supra, 57 Cal.2d at p. 177.)20
Appellant’s due process rights are not jeopardized by our interpretation. Protection of individuals against danger is among the most fundamental of state interests. Also, dangerous mentally ill persons gain *184no perpetual “vested right” in the commitment scheme extant when their illnesses first came to public attention. To say that they have “reasonably relied” on that scheme in displaying their dangerous conditions is to indulge a patent fiction. Such a rule would severely hamper legislative efforts to respond to new knowledge about mental illness, correct perceived deficiencies in the statutory scheme, and refine the state’s machinery for treatment and restraint of dangerously disturbed people. (See Bouquet, supra, 16 Cal.3d at pp. 592-593.) We conclude the 1974 amendments may properly govern appellant’s commitment.
The judgment and order appealed from are reversed.
Tobriner, J., Mosk, J., and Manuel, J., concurred.
The alleged killing apparently occurred during a dispute between appellant and an employee of the plant where he had worked. Appellant, whose many names include Cookie Lasagna, arrived at the plant in a specially tailored, 10-star-general’s uniform befitting his self-proclaimed position as Commander-in-Chief of the armed forces. He began operating an electric saw to modify a paint brush he uses in his work as a “professional neurosurgeon.” The victim, Darrell Yearwood, a “montclape” (appellant’s term for most black people), ordered him out; a fight started; and appellant shot Year-wood with a .22-caliber pistol he had brought.
In various incarnations appellant perceives himself as God and the President of the United States (and thus as supreme director of the FBI, the CIA, etc.). He was secret president by arrangement with Lyndon Johnson, but only Dwight Eisenhower was fully aware of his mission. He has deposited substances which will change everything at secret locations near the United Nations and in the Los Angeles sewer system. He states he has weapons stored around the country.
He views the killing as self defense or justifiable homicide. He has repeatedly asked for a criminal trial and has opposed defense counsel’s wish to enter an insanity plea.
The March 1978 conservatorship order here challenged expired by terms of the LPS Act’s “gravely disabled” provisions in May 1979 and is therefore technically moot. (§ 5361.) Yet the issues are of recurring importance. (Diamond v. Bland (1970) 3 Cal.3d 653, 657 [91 Cal.Rptr. 501, 477 P.2d 733], cert. den. sub nom. Homart Development Co. v. Diamond (1971) 402 U.S. 988 [29 L.Ed.2d 153, 91 S.Ct. 1661], reh. den., 404 U.S. 874 [30 L.Ed.2d 120, 92 S.Ct. 27], (1972) 405 U.S. 981 [31 L.Ed.2d 257, 92 S.Ct. 1189], 409 U.S. 897 [34 L.Ed.2d 154, 93 S.Ct. 91]; DiGiorgio Fruit Corp. v. Dept. of Employment (1961) 56 Cal.2d 54, 58-59 [13 Cal.Rptr. 663, 362 P.2d 487].) Moreover, LPS Act conservatorship was renewed and appellant reconfined in 1979 on substantially identical findings.
An appeal from the 1979 order, raising similar issues, is pending before the Court of Appeal. (Conservatorship of Hofferber, 2 Civ. 57096.) No party urges us to dismiss the appeal from the 1978 order. Thus we decide the case on its merits.
Though Jackson had been deemed hopelessly incompetent, hearings on his continued confinement never had addressed any other basis of state power to confine the mentally ill. The Supreme Court doubted he could be committed for dangerousness on the basis of the misdemeanor charges pending against him. Also, though his hopeless *169deafness and inability to communicate rendered him incompetent to stand trial they did not appear to require custodial care. (406 U.S. at pp. 727-728 [32 L.Ed.2d at p. 445].)
The defendants in Davis, also accused of nonviolent misdemeanors, never had been deemed hopelessly incompetent. This court therefore continued their confinement but ordered prompt progress reports and resolution of the progress issue within a reasonable time. (8 Cal.3d at p. 806.)
Section 1370, subdivision (c)(1) provides: “If, at the end of three years from the date of commitment or a period of commitment equal to the maximum term of imprisonment provided by law for the most serious offense charged in the information, indictment, or misdemeanor complaint, whichever is shorter, the defendant has not recovered his mental competence, he shall be returned to the committing court. The court shall notify the county mental health director or his designee of such return and of any resulting court orders.”
Section 1370, subdivision (b)(1) provides: “Within 90 days of a commitment made pursuant to subdivision (a), the superintendent of the state hospital or other facility to which the defendant is committed or from which the defendant is placed on outpatient treatment shall make a written report to the court and the county mental health director or his designee concerning the defendant’s progress toward recovery of his mental competence. If the defendant has not recovered his mental competence, but the report discloses a substantial likelihood the defendant will regain his mental competence in the foreseeable future, he shall remain in the state hospital or other facility or on outpatient treatment. Thereafter, at six-month intervals or until the defendant becomes mentally competent, the superintendent of the hospital or person in charge of the facility shall report to the court and the county mental health director or his designee regarding the defendant’s progress toward recovery of his mental competence. If the report indicates that there is no substantial likelihood that the defendant will regain his mental competence in the foreseeable future, the committing court shall order him to be returned to the court for proceedings pursuant to paragraph (2) of subdivision (c). The court shall transmit a copy of its order to the county mental health director or his *170designee.” (Cf. Note, Procedural Safeguards for Periodic Review: A New Commitment to Mental Patients’ Rights (1979) 88 Yale L.J. 850.)
Section 1370, subdivision (c)(2) provides: “Whenever any defendant is returned to the court pursuant to paragraph (2) of subdivision (b) or paragraph (1) of subdivision (c) and it appears to the court that the defendant is gravely disabled as defined in paragraph (2) of subdivision (h) of Section 5008 of the Welfare and Institutions Code, the court shall order the conservatorship investigator of the county of commitment of the defendant to initiate conservatorship proceedings for such defendant pursuant to Chapter 3 (commencing with Section 5350) of Part 1 of Division 5 of the Welfare and Institutions Code. Any hearings required in the conservatorship proceedings shall be held in the superior court in the county which ordered the commitment. The court shall transmit a copy of the order directing initiation of conservatorship proceedings to the county mental health director or his designee.”
Section 5008 now provides in pertinent part: “(h) For purposes of Article 1 (commencing with Section 5150), Article 2 (commencing with Section 5200), and Article 4 (commencing with Section 5250) of Chapter 2 of this part, and for the purposes of 3 with Section of this disabled’ means:
“(1) A condition in which a person, as a result of a mental disorder, is unable to provide for his basic personal needs for food, clothing, or shelter; or
“(2) A condition in which a person, has been found mentally incompetent under Section 1370 of the Penal Code and all of the following facts exist:
“(i) The indictment or information pending against the defendant at the time of commitment charges a felony involving death, great bodily harm, or a serious threat to the physical well-being of another person.
“(ii) The indictment or information has not been dismissed.
“(iii) As a result of mental disorder, the person is unable to understand the nature and purpose of the proceedings taken against him and to assist counsel in the conduct of his defense in a rational manner.”
Penal Code section 1368.1, subdivision (a) provides that filing of an indictment or information must precede incompetence proceedings. Section 5008, subdivision (h)(2) limits “gravely disabled” criminal incompetents to those against whom indictments or informations charging violent felonies are pending. (Subd. (h)(2)(i), (ii).)
The conservator concedes that, because a fundamental liberty interest is at stake, strict scrutiny is the correct standard of review. (In re Moye (1978) 22 Cal.3d 457, 465 [149 Cal.Rptr. 491, 584 P.2d 1097]; People v. Olivas (1976) 17 Cal.3d 236, 251 [131 Cal.Rptr. 55, 551 P.2d 375]; see In re Gary W. (1971) 5 Cal.3d 296, 306-307 [96 Cal.Rptr. 1, 486 P.2d 1201]. Cf. Spece, Justifying Invigorated Scrutiny and the Least Restrictive Alternative as a Superior Form of Intermediate Review: Civil Commitment and the Right to Treatment as a Case Study (1979) 21 Ariz.L.Rev. 1049.)
Interestingly, at its 1979 session the United Nations Sub-Committee on Prevention of Discrimination and Protection of Minorities requested the United Nations Secretary-General to prepare a report “with a view to the formulation of guidelines” regarding:
“(a) the medical measures that may properly be employed in the treatment of persons detained on the grounds of mental ill-health, and
“(b) procedures for determining whether adequate grounds exist for detaining such persons and applying such medical measures.
“The resolution arose from the allegations that in some countries, persons are confined to mental health clinics against their will, as a method of punishment for their political views or non-violent exercise of their human rights.” (U.N. Press Release HR/799, 7 Sept. 1979.)
Jackson said that “[i]f criminal conviction and imposition of sentence are insufficient” to apply lesser “procedural and substantive protection against indefinite commitment” than is available to other persons, “the mere filing of criminal charges surely cannot suffice.” (406 U.S. at p. 724 [32 L.Ed.2d at p. 443], italics added.) For that proposition the court relied on Baxstrom v. Herold, supra, 383 U.S. 107; Humphrey v. Cady (1972) 405 U.S. 504 [31 L.Ed.2d 394, 92 S.Ct. 1048]; Bolton v. Harris (D.C.Cir. 1968) 395 F.2d 642, and People v. Lally (1966) 19 N.Y.2d 27 [277 N.Y.S.2d 654, 224 N.E.2d 87]. Baxstrom and Humphrey, however, dealt with procedural safeguards denied persons nearing the end of their penal confinements. No justification was perceived for classifying persons as “particularly dangerous” and therefore deserving of less procedural protection against civil commitment than others solely because their criminal trials had resulted in penal restraint about to expire. (Humphrey, supra, 405 U.S. at pp. 510-511 [31 L.Ed.2d at pp. 403-404]; Baxstrom, supra, 383 U.S. at pp. 114-115 [15 L.Ed.2d at pp. 625-626].)
Bolton and Lally, though nullifying local statutes for automatic commitment of the criminally insane, acknowledged the state’s right to make reasonable distinctions between civilly and criminally committed persons. (Bolton, supra, 395 F.2d at p. 651; Lally, supra, 224 N.E.2d at pp. 90-91.)
In Franklin we concluded that Baxstrom, Bolton, and Lally did not preclude California’s automatic prehearing commitment provisions from being applied solely to the criminally insane. (7 Cal.3d at pp. 139-142.) Read in context, Jackson stands only for the proposition that consideration of prior criminal conduct as a basis for distinguishing among dangerous persons must be reasonable.
Jackson concluded that an incompetent criminal defendant could be held solely on grounds of his continuing incompetence only for the time reasonably necessary to determine whether further hospital treatment is likely to assist his restoration to competence. The current California scheme responds by providing that confinement under the Penal Code shall cease once there is no substantial likelihood of restoration to competence, with a maximum confinement of three years. (§ 1370, subds. (b)(1), (c)(1).) The assumption is that three years is a reasonable time to reach a prognosis; persons not restored to competence by that time are, in effect, treated as permanently incompetent. (There is some indication here that hospital authorities do believe appellant will never improve.)
We distinguish People v. Smith, supra, 5 Cal.3d 313, which found no rational basis for differing periods of extended confinement for “presently dangerous” Youth Authority inmates who had served their original terms, depending on whether they had originally been convicted in adult court or committed under the juvenile law. (P. 318.) By contrast, the Legislature properly treats with continuing concern those particularly dangerous persons whose violent conduct warranted felony charges but whose mental disorders preclude possibility of confinement under criminal law.
A distinction of this kind is not invalid for the reason that theoretically it allows alternative treatment of particular conduct depending on whether criminal charges were filed and pursued. (See §§ 5300, 5304 [actual violence or infliction of harm necessary for traditional civil commitment].) Such an argument would apply to all separate treatment arising from decisions by public authorities whether to prosecute, including that provided for the criminally insane and MDSO’s.
Under 1979 amendments, criminally insane persons whose offenses occurred after July 1, 1977, the operative date of the original determinate sentence law (DSL), may not be held under section 1026 longer than their upper DSL terms, except that renewable two-year extended commitments are imposable on persons who committed specified felonies threatening or inflicting death or serious bodily injury and “who by reason of a mental disease, defect, or disorder [represent] a substantial danger of physical harm to others.” (Pen. Code, § 1026.5.)
We decline appellant’s invitation to apply the “imminent threat” standard for 90-day civil commitments under the LPS Act. (§ 5304.) That 90-day provision is intended to deal with less serious, episodic violence on a short-term basis by requiring release once the immediate danger has passed. The Legislature obviously felt that violence represented by serious crime calls for Ionger-range protection.
In the 1977 competence hearing Judge Chernow noted that appellant had admitted the killing and had made references to driving a stake through a relative’s heart. He found, among other things, that appellant would be dangerous if free of secure confinement. The “stake” reference and the 1974 conduct, though relevant to a finding of current dangerousness, are not conclusive as to appellant’s current propensities. Appellant’s admission adds little or nothing of importance.
The crucial fact is that the conservator refers us to no point in the 1977 competence hearing or the March 1978 conservatorship proceeding at which new evidence addressed directly to appellant’s present dangerousness was received or considered.
The conservator notes that under the “gravely disabled” provisions confinement is not automatic but subject to the conservator’s controlled discretion. (§§ 5358, 5361, 5364.) Roulet rejected the notion that such discretion justified less procedural protection at the factfinding stage than where confinement is obligatory. (23 Cal.3d at pp. 222-223, 228-230.) Appellant has been confined continuously since 1974.
We recognize that LPS Act conservatees often are confined at Patton and Atascadero State Hospitals, prisonlike institutions that also house MDSO’s convicted of crime. (Conservatorship of Roulet, supra, 23 Cal.3d 219, 226; People v. Burnick, supra, 14 Cal.3d 306, 319-320.) Appellant has been confined at both institutions.
Teron held that the 1977 death penalty law could not be applied retroactively to crimes committed before its enactment. The 1977 law had been adopted to replace the 1973 law thaf this court held unconstitutional in 1976. Teron distinguished Bouquet on grounds that it involved only property rights, not penal sanctions. Teron further noted that the statute in Bouquet filled an absolute vacuum created by probable unconstitutionality of prior community property law, while failure to apply the 1977 death-law retroactively would simply reduce defendant's punishment to life imprisonment.
Here, as in Bouquet, extreme penal sanctions are not involved. Moreover the Legislature, by noting post-Davis “uncertainty” about appropriate procedures for criminal incompetents, articulated its apprehension that a Bouquet-style vacuum had arisen.
Teron, supra, implicitly rejected the argument that “urgency” and “public protection” expressions showed a legislative intent to make a death penalty law retroactive. (See conc. opn. of Richardson, J., 23 Cal.3d at p. 120; dis. opn. of Clark, J., id., at p. 126.) But again, an important distinction exists between laws that increase punishment for past conduct, on the one hand, and those authorizing preventive confinement of potentially dangerous persons on the other. The latter statutes look primarily to the avoidance of future harm; their prophylactic purpose would be thwarted if they applied only to persons whose violent propensities first surfaced after the effective date. Justice Richardson also pointed out in his Teron concurrence that death penalty cases are sui generis and require a particularly stringent view of retroactive “intent.”