This is a petition for a writ of habeas corpus originally filed with the clerk of this court for Suffolk County and reserved and reported to the full court by a single justice, without decision, on the petition and a stipulation of facts. The petitioner seeks his release from the treatment center at the Massachusetts Correctional Institution at Bridgewater (Bridgewater) to which he has been committed by order of a Superior Court judge, acting under G. L. c. 123A, § 6, for an indeterminate period of from one day to life as a sexually dangerous person (SDP). G. L. c. 123A, § 1. We review the background of this case.
On October 23, 1964, the petitioner pleaded guilty in the Superior Court in Suffolk County to indictments charging him with indecent assault and battery on a child under fourteen, G. L. c. 265, § 13B, and assault and battery, G. L. c. 265, § 13A. After hearing testimony from the arresting officer about the incidents and after listening to recommendations from the assistant district attorney and defense counsel as to sentencing, the judge sentenced *471 the petitioner to four to five years at the Massachusetts Correctional Institution at Walpole (Walpole) on the indictment charging indecent assault and battery on a child under fourteen and to two and one-half years at the Suffolk County house of correction on the indictment charging assault and battery. The sentences were to run consecutively.
On February 11, 1965, the petitioner was transferred from Walpole to the Massachusetts Correctional Institution at Norfolk (Norfolk). On November 16, 1965, the acting superintendent of Norfolk moved for and obtained an order under G. L. c. 123A, § 6, that the petitioner be committed to the treatment center at Bridgewater for a sixty-day period of observation and diagnosis to determine whether he was an SDP. The resulting psychiatric report indicated that he was an SDP. On February 23, 1967, a hearing was conducted in the Superior Court on a petition filed by the district attorney that the petitioner be committed to the treatment center for an indeterminate period as an SDP. After the hearing, the judge found the petitioner to be an SDP and granted the district attorney’s petition.
More than two years after his indeterminate commitment to the treatment center, the petitioner filed a petition for a writ of error, alleging that his guilty pleas to the criminal indictments were made without his knowing all the ramifications of such pleas, in particular, that he might be committed under G. L. c. 123A as an SDP. In the writ of error proceeding, the petitioner alleged that the circumstances of his pleas did not satisfy the knowing waiver requirement of
Boykin
v.
Alabama,
The stipulation of facts suggests that four questions are presented in this case. The first two questions together ask, in effect, whether the admission at the indeterminate commitment hearing of evidence relating to the petitioner’s prior convictions of two sex offenses (see G. L. c. 123A, §§ 3, 4) violated the rule of
Commonwealth
v.
Bladsa,
I. The Hearsay Issue.
In
Commonwealth
v.
McGruder,
In
Commonwealth
v.
Bladsa,
In the present case, the petitioner apparently asserts that the Bladsa holding, or the implications of that holding, rendered improper the admission in evidence, at the hearing which resulted in his indeterminate commitment, of (1) the records of the convictions for indecent assault and battery and assault and battery, sentences for which the petitioner was then serving, (2) the record of the conviction of the petitioner in 1948 in Texas on a charge of rape, (3) the testimony of the examining psychiatrists, who based their opinions of the petitioner’s sexual dangerousness in part on the fact that the petitioner had been convicted of the offenses noted in (1) and (2) above and in part on the circumstances of the Massachusetts convictions as described in police and other reports, as well as in part on interviews with and observations of the petitioner, and (4) the testimony of a police officer regarding the circumstances of the Massachusetts crimes.
As to (1) and (2), the records of convictions of rape, assault and battery, and indecent assault and battery on a child under fourteen, the petitioner argues that they should have been excluded because “the fair determination of sexual dangerousness is . . . [severely] prejudiced by the presentation of evidence of past criminal convictions.” The short answer here is that § 5 provides that at a commitment hearing “it shall be competent to *475 introduce evidence of the person’s past criminal . . . record.” Nothing in the Bladsa decision suggests that this provision is invalid. Indeed, it is difficult to conceive of evidence which is more probative of sexual dangerousness and more surrounded with assurances of accuracy than records of convictions of violent sex crimes.
As to (3), the testimony of psychiatrists who based their opinions to some extent on information contained in police and other official reports, the similarly short answer is that § 4 provides that the examining psychiatrists shall be supplied with “copies of the court record . . . and . . . the probation record . . . [which] shall contain a history . . . [of] such person’s previous offences . . ..” Nothing in the
Bladsa
decision suggests that this provision is invalid. We note in passing that the records in question are official records and, therefore, possess some likelihood of trustworthiness. See
Commonwealth
v.
McGruder,
As to (4), the oral testimony of the police officer regarding the circumstances leading up to the two Massachusetts convictions in 1964, this evidence, although relevant, may have been technically inadmissible under the Bladsa rule because it was apparently partially based on information which was contained in police reports and which was not all within the officer’s personal knowledge. We believe, however, that any error in this regard was harmless beyond a reasonable doubt.
As we stated at the beginning of this opinion, the judge who sentenced the petitioner for his Massachusetts crimes, after receiving the petitioner’s pleas of guilty to the charges, heard testimony from the arresting officer about the incidents. A transcript of this hearing was part of the record in the petitioner’s writ of error proceeding in this court. We now judicially notice that record.
Poland
v.
New Bedford, Woods Hole, Martha’s Vineyard & Nantucket S.S. Authy.
The arresting officer who testified at the 1964 trial was the same officer who testified at the petitioner’s commitment hearing. We have carefully compared the officer’s testimony on the former occasion with his testimony on the latter occasion, and the two are the same in every material respect. After the officer completed his testimony on the former occasion, the petitioner’s then attorney was asked by the judge, “Counsel, any questions?” The petitioner’s attorney answered, “No questions.” The two victims of the petitioner’s crimes, a six-year old girl and an eleven-year old boy, were then present in court and had been asked to come forward. The petitioner through his attorney also declined the opportunity to examine them in relation to the incidents in question. After hearing recommendations of counsel, the judge then sentenced the petitioner.
*477
In these circumstances, we find it difficult to see that any policy of the hearsay rule or of the confrontation clause of the Sixth Amendment to the United States Constitution was violated when the arresting officer repeated his 1964 testimony at the later commitment hearing. See
Pointer
v.
Texas,
In regard to the hearsay issue, we note finally that the petitioner’s commitment hearing occurred prior to the date of the Bladsa decision. We have no intention of suggesting by our reaching of the merits on this question that the Bladsa rule invalidates any commitments which antedate that decision. In any event, the remedy for a Bladsa-type violation would seem to be a new hearing — something to which SDPs will in any case be periodically entitled in accordance with-our decision hereafter.
*478 II. The Due Process and Equal Protection Issues.
The petitioner argues that his Federal and State constitutional rights to due process and equal protection are denied by virtue of the inadequacy of the procedural safeguards accorded to persons committed as SDPs under G. L. c. 123A, § 6, particularly when those safeguards are contrasted with the ones granted to persons committed as mentally ill persons under various provisions of G. L. c. 123. We agree with that argument in some respects and, accordingly, we afford some relief. We begin, however, by stating that we adhere to the often expressed view that the basic substantive premise of c. 123A, that persons convicted of crimes and thereafter found to be sexually dangerous may be subjected to commitment to a treatment center until cured or rehabilitated, does not constitute a denial of equal protection solely because the operation of the statute does not reach nonconvicts or convicts who are not sexually dangerous.
Peterson, petitioner,
Chapter 123A pertains in its entirety to the commitment and treatment of SDPs. Under § 6, proceedings for commitment are begun when “a prisoner under sentence in any jail, house of correction or prison . . . appears to the . . . [person] who has him in custody ... to be a sexually dangerous person and in need of the care and *479 treatment provided at the center,” and the “[person] who has him in custody” moves that the court commit the prisoner to the treatment center for a sixty-day period of observation and diagnosis. If the psychiatric report compiled after this period “clearly indicates that such prisoner is a sexually dangerous person,” then the district attorney may file a petition for the petitioner’s ultimate commitment as an SDP. If after a hearing on this petition the court finds that the prisoner is an SDP, it shall commit him to the center for an indeterminate period of from one day to life.
Under § 1 an SDP is defined as “ [a]ny person whose misconduct in sexual matters indicates a general lack of power to control his sexual impulses, as evidenced by repetitive or compulsive behavior and either violence, or aggression by an adult against a victim under the age of sixteen years, and who as a result is likely to attack or otherwise inflict injury on the objects of his uncontrolled or uncontrollable desires.”
While c. 123A concerns the commitment and treatment of SDPs, c. 123 pertains in its entirety to the commitment and treatment of mentally ill and mentally retarded persons. The provision in c. 123 which most closely parallels c. 123A, § 6, is § 18. Under § 18, “[i]f the person in charge of any place of detention within the commonwealth has reason to believe that a person confined therein is in need of hospitalization by reason of mental illness at . . . Bridgewater state hospital [the hospital], he shall cause such prisoner to be examined at such place of detention by a physician or physicians . . . [who] shall report the results of the examination to the district court which has jurisdiction over the place of detention . . ..” The court may then commit the prisoner to the hospital for a thirty-day examination period. After receipt of this report, the court may, on petition and after a hearing, if one is requested, order the prisoner committed to the hospital if “it finds that (1) such person is mentally ill; (2) such person is not a proper subject for *480 commitment to any [other less secure] facility of the department [of Mental Health]; and (3) the failure to retain such person in strict custody would create a likelihood of serious harm.” G. L. c. 123, §§ 8 (d), 18. 1
“Mental illness” is not statutorily defined, but is defined by a Department of Mental Health Regulation as “a substantial disorder of thought, mood, perception, orientation, or memory which grossly impairs judgment, behavior, capacity to recognize reality, or ability to meet the ordinary demands of life.”
The foregoing outlines of c. 123A, § 6, and c. 123, § 18, as the latter is affected by the quoted regulation, make it plain that many SDPs could be proceeded against under either statute. Moreover, it is worthy of some note that both the treatment center and the hospital are part of the same correctional institution. See G. L. c. 123A, §2;c. 125, § 18. And it would appear that the governmental interest in protecting society from violence from the mentally ill while they are being treated would be substantially similar to the interest in protecting society from the sexually dangerous while they are being treated.
In view of the generally similar functions and effects of c. 123A, § 6, and c. 123, § 18, the Commonwealth is constitutionally bound to extend substantially similar procedural and substantive safeguards to persons affected by either statute.
“Baxstrom
[v.
Herold,
We believe that we are compelled by the equal protection clause of the Fourteenth Amendment to the United States Constitution to hold here that any significant procedural rights granted to persons involuntarily committed under c. 123 must be extended to persons involuntarily committed under c. 123A, § 6, at least when such commitment extends beyond the limits of the maximum sentence which was imposed on the SDP following his conviction. Bax
strom
v.
Herold, supra. Humphrey
v.
Cady, supra. Jackson
v.
Indiana, supra. Murel
v.
Baltimore City Criminal Court,
Considering first the procedures employed in regard to both the initial observational commitment and the ultimate commitment, we think that c. 123A, § 6, compares rather favorably in many respects to c. 123, § 18. The frequent litigation of constitutional issues in the context of
*482
SDP proceedings has produced a significant body of case law on the subject. Of course c. 123A itself, in relation to the ultimate commitment at least, has long provided the prisoner with prior “notice, a hearing, compulsory process, and the assistance of counsel who is entitled to receive the reports of the examining psychiatrists.”
Peterson, petitioner,
Many of the listed protections have now been incorporated explicitly into § 6 by the Legislature. St. 1974, c. 324, §§ 2, 3. Without setting out here all the procedural protections afforded persons subjected to initial observation and final commitment under c. 123, we think it sufficient to state that we have considered them and conclude that they are in no material respect superior to those afforded persons subjected to initial observation and final commitment under c. 123A, § 6. SDPs, therefore, are not denied equal protection of the laws by being committed under the procedures set out in § 6, as that section has been judicially construed, rather than under the procedures set out in c. 123.
However, when we turn to an examination of the duration of the commitment and of the prescribed procedures by which the person committed may obtain his release, we find that SDPs are much more severely burdened than are the mentally ill committed under c. 123, including those prisoners committed under c. 123, § 18. In particular, an SDP is, according to § 6, committed to the treatment center “for an indeterminate period of a minimum of one day and a maximum of such person’s natural life.” Unless otherwise paroled, an SDP’s only remedy is that he “shall be entitled to have a hearing for examination and discharge once in every twelve months, upon the filing of a written petition” therefor by him or by someone in his behalf. After such a hearing, the SDP may be discharged or conditionally discharged only “ [u]pon a finding by the court that such person is no longer a sexually dangerous person.” G. L. c. 123A, § 9. In short, the burden is on the SDP to bring the petition for his release and to prove he is no longer sexually dangerous. If he does not sustain this burden, his commitment will continue indefinitely, subject to the outcome of later annual hearings.
In contrast to the pattern established by §§ 6 and 9 of c. 123A is that established by §§ 18 and 5-8 of c. 123. *484 Under these latter provisions, a mentally ill prisoner committed to the hospital under § 18 must be discharged at the end of his prison sentence unless, prior to that date, he is the subject of a new commitment order by a court acting pursuant to §§ 5-8 of c. 123. Under § 8 (f), the first order of commitment is valid for a period of six months, and each subsequent order of commitment is valid for one year. Sections 7 and 8 make it clear that the burden is on the Commonwealth to move for and obtain each additional order of commitment. Under § 8 (f) and paragraphs (b) and (c) of § 7, for example, the hospital medical director must petition the local District Court for a new commitment order when the term of the previous order expires. Notice must issue to the person committed and to his nearest relative or guardian of the receipt of the petition and of the availability of a hearing within fourteen days of a request for one. By virtue of § 8 (d), the person who requests a hearing cannot be recommitted unless the court “finds that (1) such person is mentally ill; (2) such person is not a proper subject for commitment to any facility [other than the hospital] of the department [of Mental Health]; and (3) the failure to retain such person in strict custody would create a likelihood of serious harm.”
In
Commonwealth
v.
Druken,
We believe that the Druken and Jackson cases are controlling here, and that they do not permit the disparity of burdens in the release provisions which currently exist between § 9 of c. 123A and §§ 7 and 8 of c. 123. We accordingly hold that at any annual hearing on a petition by an SDP for his release from the treatment center the Commonwealth shall have the burden of proving that as of the time of the hearing the person committed continues to be sexually dangerous. We do not transfer the obligation of filing the petition to the Commonwealth because such a transfer would require a rewriting of the statute, and that is beyond our province to do. In any case, we think that the physical act of filing a petition is an insubstantial obligation on the SDP, at least where the burden of proof which usually rests on the shoulders of a petitioner has been transferred to the respondent. We do assume, however, that the Department of Mental Health maintains records which will enable it to inform committed persons of their eligibility for periodic review on the question of their release. If no new order of commitment is issued after such review, the person is to be returned to the custody of the Department of Correction to serve the balance of his sentence, if any *486 such balance remains, and if the person’s sentence has expired, he is to be released.
We turn finally to the question of what burden of proof the Commonwealth must satisfy in order to obtain an original or subsequent order of commitment of an allegedly SDP. Because neither c. 123A nor c. 123 specifies the burden of proof in proceedings thereunder, the section-by-section cross-comparison utilized in the equal protection analysis is of little assistance. The equal protection clause aside, however, it is still clear that persons subjected to c. 123A proceedings are entitled to procedural due process.
Commonwealth
v.
Gomes,
In
Speiser
v.
Randall,
We have consistently labeled c. 123A proceedings civil and nonpunitive. See, for example,
Commonwealth
v.
Hogan,
In commenting on a proceeding under a Pennsylvania statute which is generally similar to c. 123A, the United States Court of Appeals for the Third Circuit stated: “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
*488
a proceeding is entitled to the full panoply of the relevant protections which due process guarantees in state criminal proceedings. He must be afforded all those safeguards which are fundamental rights and essential to a fair trial . . ..”
United States ex rel. Gerchman
v.
Maroney,
As of the date of our decision, the Supreme Court has not ruled on the precise question of the degree of the burden of proof required in cases involving involuntary commitment of SDPs or mentally ill persons. See
Murel
v.
Baltimore City Criminal Court,
The late Mr. Justice Harlan expressed well the “comparative social disutility,”
In re Winship,
In discussing the California statute providing for commitment of mentally disoriented sex offenders (MDSOs), the California Supreme Court pointed out that (1) a person adjudicated an MDSO faces a loss of liberty potentially more grievous than that facing a juvenile adjudicated a delinquent, since the MDSO commitment could last for the rest of the MDSO’s life, and (2) a person adjudicated an MDSO receives a stigma at least as great as that flowing from a criminal conviction or an adjudication of juvenile delinquency.
People
v.
Burnick,
III. Conclusion.
We have held above that the petitioner is at present lawfully in custody. Accordingly, the petition for a writ of habeas corpus must be, and hereby is, denied. Hereafter, however, the petitioner will be entitled to periodic review of his status under G. L. c. 123A, § 9, and in accordance with this opinion.
So ordered.
Notes
“Likelihood of serious harm” is defined in § 1 as “(1) a substantial risk of physical harm to the person himself as manifested by evidence of threats of, or attempts at, suicide or serious bodily harm; (2) a substantial risk of physical harm to other persons as manifested by evidence of homicidal or other violent behavior or evidence that others are placed in reasonable fear of violent behavior and serious physical harm to them; or (3) a very substantial risk of physical impairment or injury to the person himself as manifested by evidence that such person’s judgment is so affected that he is unable to protect himself in the community and that reasonable provision for his protection is not available in the community.”
