opinion: Mr. Justice Blackmun delivered the opinion of the Court.
  We are here concerned with the constitutionality of certain aspects of Indiana’s system for pretrial commitment of one accused of crime.
  Petitioner, Theon Jackson, is a mentally defective deaf mute with a mental level of a pre-school child. He cannot read, write, or otherwise communicate except through limited sign language. In May 1968, at age 27, he was charged in the Criminal Court of Marion County, Indiana, with separate robberies of two women. The offenses were alleged to have occurred the preceding July. The first involved property (a purse and its contents) of the value of four dollars. The second concerned five dollars in money. The record sheds no light on these charges since, upon receipt of not-guilty pleas from Jackson, the trial court set in motion the Indiana procedures for determining his competency to stand trial. Ind. Ann. .Stat. § 9-1706a (Supp. 1971), now Ind. Code 35-5-3-2 (1971).
  As the statute requires, the court appointed two psychiatrists to examine Jackson. A competency hearing was subsequently held at which petitioner was represented by counsel. The court received the examining doctors’ joint written report and oral testimony from them and from a deaf-school interpreter through whom they had attempted to communicate with petitioner. The report concluded that Jackson’s almost nonexistent communication skill, together with his lack of hearing and his mental deficiency, left him unable to understand the nature of the charges against him or to participate in his defense. One doctor testified that it was extremely unlikely that petitioner could ever learn to read or write and questioned whether petitioner even had the ability to develop any proficiency in sign language. He believed that the interpreter had not been able to communicate with petitioner to any great extent and testified that petitioner’s “prognosis appears rather dim.” The other doctor testified that even if Jackson were not a deaf mute, he would be incompetent to stand trial, and doubted whether petitioner had sufficient intelligence ever to develop the necessary communication skills. The interpreter testified that Indiana had no facilities that could help someone as badly off as Jackson to learn minimal communication skills.
  On this evidence, the trial court found that Jackson “lack[ed] comprehension sufficient to make his defense,” § 9-1706a, and ordered him committed to the Indiana Department of Mental Health until such time as that Department should certify to the court that “the defendant is sane.”
  Petitioner’s counsel then filed a motion for a new trial, contending that there was no evidence that Jackson was “insane,” or that he would ever attain a status which the court might regard as “sane” in the sense of competency to stand trial. Counsel argued that Jackson’s commitment under these circumstances amounted to a “life sentence” without his ever having been convicted of a crime, and that the commitment therefore deprived Jackson of his Fourteenth Amendment rights to due process and equal protection, and constituted cruel and unusual punishment under the Eighth Amendment made applicable to the States through the Fourteenth. The trial court denied the motion. On appeal the Supreme Court of Indiana affirmed, with one judge dissenting. 253 Ind. 487, 255 N. E. 2d 515 (1970). Rehearing was denied, with two judges dissenting. We granted certiorari, 401 U. S. 973 (1971).
  For the reasons set forth below, we conclude that, on the record before us, Indiana cannot constitutionally commit the petitioner for an indefinite period simply on account of his incompetency to stand trial on the charges filed against him. Accordingly, we reverse.
  I
  Indiana Commitment Procedures
  Section 9-1706a contains both the procedural and substantive requirements for pretrial commitment of incompetent criminal defendants in Indiana. If at any time before submission of the case to the court or jury the trial judge has “reasonable ground” to believe the defendant “to be insane,” he must appoint two examining physicians and schedule a competency hearing. The hearing is to the court alone, without a jury. The examining physicians’ testimony and “other evidence” may be adduced on the issue of incompetency. If the court finds the defendant “has not comprehension sufficient to understand the proceedings and make his defense,” trial is delayed or continued and the defendant is remanded to the state department of mental health to be confined in an “appropriate psychiatric institution.” The section further provides that “[w] hen ever the defendant shall become sane” the superintendent of the institution shall certify that fact to the court, and the court shall order him brought on to trial. The court may also make such an order sua sponte. There is no statutory provision for periodic review of the defendant’s condition by either the court or mental health authorities. Section 9-1706a by its terms does not accord the defendant any right to counsel at the competency hearing or otherwise describe the nature of the hearing; but Jackson was represented by counsel who cross-examined the testifying doctors carefully and called witnesses on behalf of the petitioner-defendant.
  Petitioner’s central contention is that the State, in seeking in effect to commit him to a mental institution indefinitely, should have been required to invoke the standards and procedures of Ind. Ann. Stat. § 22-1907, now Ind. Code 16-15-1-3 (1971), governing commitment of “feeble-minded” persons. That section provides that upon application of a “reputable citizen of the county” and accompanying certificate of a reputable physician that a person is “feeble-minded and is not insane or epileptic” (emphasis supplied), a circuit court judge shall appoint two physicians to examine such person. After notice, a hearing is held at which the patient is entitled to be represented by counsel. If the judge determines that the individual is indeed “feeble-minded,” he enters an order of commitment and directs the clerk of the court to apply for the person’s admission “to the superintendent of the institution for feeble-minded persons located in the district in which said county is situated.” A person committed under this section may be released “at any time,” provided that “in the judgment of the superintendent, the mental and physical condition of the patient justifies it.” § 22-1814, now Ind. Code 16-15-4-12 (1971). The statutes do not define either “feeble-mindedness” or “insanity” as used in § 22-1907. But a statute establishing a special institution for care of such persons, § 22-1801, refers to the duty of the State to provide care for its citizens who are “feeble-minded, and are therefore unable properly to care for themselves.” These provisions evidently afford the State a vehicle for commitment of persons in need of custodial care who are “not insane” and therefore do not qualify as “mentally ill” under the State's general involuntary civil commitment scheme. See §§ 22-1201 to 22-1256, now Ind. Code 16-14-9-1 to 16-14^0-31, 16-13-2-9 to 16-13-2-10, 35-5-3-4, 16-14-14-1 to 16-14-14-19, and 16-14415-5, 16-14-15-1, and 16-14-19-1 (1971).
  Scant attention was paid this general civil commitment law by the Indiana courts in the present case. An understanding of it, however, is essential to a full airing of the equal protection claims raised by petitioner. Section 22-1201 (1) defines a “mentally ill person” as one who
  “is afflicted with a psychiatric disorder which substantially impairs his mental health; and, because of such psychiatric disorder, requires care, treatment, training or detention in the interest of the welfare of such person or the welfare of others of the community in which such person resides.”
  Section 22-1201 (2) defines a “psychiatric disorder” to be any mental illness or disease, including any mental deficiency, epilepsy, alcoholism, or drug addiction. Other sections specify procedures for involuntary commitment of “mentally ill” persons that are substantially similar to those for commitment of the feeble-minded. For example, a citizen’s sworn statement and the statement of a physician are required. § 22-1212. The circuit court judge, the applicant, and the physician then consult to formulate a treatment plan. § 22-1213. Notice to the individual is required, § 22-1216, and he is examined by two physicians, § 22-1215. There are provisions for temporary commitment. A hearing is held before a judge on the issue of mental illness. §§ 22-1209, 22-1216, 22-1217. The individual has a right of appeal. § 22-1210. An individual adjudged mentally ill under these sections is remanded to the department of mental health for assignment to an appropriate institution. § 22-1209. Discharge is in the discretion of the superintendent of the particular institution to which the person is assigned, §22-1223; Official Opinion No. 54, Opinions of the Attorney General of Indiana, Dec. 30, 1966. The individual, however, remains within the court's custody, and release can therefore be revoked upon a hearing. Ibid.
  II
  Equal Protection
  Because the evidence established little likelihood of improvement in petitioner’s condition, he argues that commitment under § 9-1706a in his case amounted to a commitment for life. This deprived him of equal protection, he contends, because, absent the criminal charges pending against him, the State would have had to proceed under other statutes generally applicable to all other citizens: either the commitment procedures for feeble-minded persons, or those for mentally ill persons. He argues that under these other statutes (1) the decision whether to commit would have been made according to a different standard, (2) if commitment were warranted, applicable standards for release would have been more lenient, (3) if committed under § 22-1907, he could have been assigned to a special institution affording appropriate care, and (4) he would then have been entitled to certain privileges not now available to him.
  In Baxstrom v. Herold, 383 U. S. 107 (1966), the Court held that a state prisoner civilly committed at the end of his prison sentence on the finding of a surrogate was denied equal protection when he was deprived of a jury trial that the State made generally available to all other persons civilly committed. Rejecting the State’s argument that Baxstrom’s conviction and sentence constituted adequate justification for the difference in procedures, the Court said that “there is no conceivable basis for distinguishing the commitment of a person who is nearing the end of a penal term from all other civil commitments.” 383 U. S., at 111-112; see United States ex rel. Schuster v. Herold, 410 F. 2d 1071 (CA2), cert. denied, 396 U. S. 847 (1969). The Court also held that Baxstrom was denied equal protection by commitment to an institution maintained by the state corrections department for “dangerously mentally ill” persons, without a judicial determination of his “dangerous propensities” afforded all others so committed.
  If criminal conviction and imposition of sentence are insufficient to justify less procedural and substantive protection against indefinite commitment than that generally available to all others, the mere filing of criminal charges surely cannot suffice. This was the precise holding of the Massachusetts Court in Commonwealth v. Druken, 356 Mass. 503, 507, 254 N. E. 2d 779, 781 (1969). The Baxstrom principle also has been extended to commitment following an insanity acquittal, Bolton v. Harris, 130 U. S. App. D. C. 1, 395 F. 2d 642 (1968); Cameron v. Mullen, 128 U. S. App. D. C. 235, 387 F. 2d 193 (1967); People v. Lolly, 19 N. Y. 2d 27, 224 N. E. 2d 87 (1966), and to commitment in lieu of sentence following conviction as a sex offender. Humphrey v. Cady, 405 U. S. 504 (1972).
  Respondent argues, however, that because the record fails to establish affirmatively that Jackson will never improve, his commitment “until sane” is not really an indeterminate one. It is only temporary, pending possible change in his condition. Thus, presumably, it cannot be judged against commitments under other state statutes that are truly indeterminate. The State relies on the lack of “exactitude” with which psychiatry can predict the future course of mental illness, and on the Court’s decision in what "is claimed to be “a fact situation similar to the case at hand” in Greenwood v. United States, 350 U. S. 366 (1956).
  Were the State’s factual premise that Jackson’s commitment is only temporary a valid one, this, might well be a different case. But the record does not support that premise. One of the doctors testified that in his view Jackson would be unable to acquire the substantially improved communication skills that would be necessary for him to participate in any defense. The prognosis for petitioner’s developing such skills, he testified, appeared “rather dim.” In answer to a question whether Jackson would ever be able to comprehend the charges or participate in his defense, even after commitment and treatment, the doctor said, “I doubt it, I don’t believe so.” The other psychiatrist testified that even if Jackson were able to develop such skills, he would still be unable to comprehend the proceedings or aid counsel due to his mental deficiency. The interpreter, a supervising teacher at the state school for the deaf, said that he would not be able to serve as an interpreter for Jackson or aid him in participating in a trial, and that the State had no facilities that could, “after a length of time,” aid Jackson in so participating. The court also heard petitioner’s mother testify that Jackson already had undergone rudimentary out-patient training in communications skills from the deaf and dumb school in Indianapolis over a period of three years without noticeable success. There is nothing in the record that even points to any possibility that Jackson’s present condition can be remedied at any future time.
  Nor does Greenwood, which concerned the constitutional validity of 18 U. S. C. §§ 4244 to 4248, lend support to respondent’s position. That decision, addressing the “narrow constitutional issue raised by the order of commitment in the circumstances of this case,” 350 U. S., at 375, upheld the Federal Government’s constitutional authority to commit an individual found by the District Court to be “insane,” incompetent to stand trial on outstanding criminal charges, and probably dangerous to the safety of the officers, property, or other interests of the United States. The Greenwood Court construed the federal statutes to deal “comprehensively” with defendants “who are insane or mentally incompetent to stand trial,” and not merely with “the problem of temporary mental disorder.” 350 U. S., at 373. Though Greenwood’s prospects for improvement were slim, the Court held that “in the situation before us,” where the District Court had made an explicit finding of dangerousness, that fact alone “does not defeat federal power to make this initial commitment.” 350 U. S., at 375. No issue of equal protection was raised or decided. See Petitioner’s Brief, No. 460, O. T. 1955, pp. 2, 7-9. It is clear that the Government’s substantive power to commit on the particular findings made in that case was the sole question there decided. 350 U. S., at 376.
  We note also that neither the Indiana statute nor state practice makes the likelihood of the defendant's improvement a relevant factor. The State did not seek to make any such showing, and the record clearly establishes that the chances of Jackson's ever meeting the competency standards of § 9-1706a are at best minimal, if not nonexistent. The record also rebuts any contention that the commitment could contribute to Jackson's improvement. Jackson’s § 9-1706a commitment is permanent in practical effect.
  We therefore must turn to the question whether, because of the pendency of the criminal charges that triggered the State’s invocation of § 9-1706a, Jackson was deprived of substantial rights to which he would have been entitled under either of the other two state commitment statutes. Baxstrom held that the State cannot withhold from a few the procedural protections or the substantive requirements for commitment that are available to all others. In this case commitment procedures under all three statutes appear substantially similar: notice, examination by two doctors, and a full judicial hearing at which the individual is represented by counsel and can cross-examine witnesses and introduce evidence. Under each of the three statutes, the commitment determination is made by the court alone, and appellate review is available.
  In contrast, however, what the State must show to commit a defendant under § 9-1706a, and the circumstances under which an individual so committed may be released, are substantially different from the standards under the other two statutes.
  Under § 9-1706a, the State needed to show only Jackson’s inability to stand trial. We are unable to say that, on the record before us, Indiana could have civilly committed him as mentally ill under § 22-1209 or committed him as feeble-minded under § 22-1907. The former requires at least (1) a showing of mental illness and (2) a showing that the individual is in need of “care, treatment, training or detention.” § 22-1201 (1). Whether Jackson’s mental deficiency would meet the first test is unclear; neither examining physician addressed himself to this. Furthermore, it is problematical whether commitment for “treatment” or “training” would be appropriate since the record establishes that none is available for Jackson’s condition at any state institution. The record also fails to establish that Jackson is in need of custodial care or “detention.” He has been employed at times, and there is no evidence that the care he long received at home has become inadequate. The statute appears to require an independent showing of dangerousness (“requires . . •. detention in the interest of the welfare of such person or . . . others . . .”). Insofar as it may require such a showing, the pending criminal charges are insufficient to establish it, and no other supporting evidence was introduced. For the same reasons, we cannot say that this record would support a feeble-mindedness commitment under § 22-1907 on the ground that Jackson is “unable properly to care for [himself].” §22-1801.
  More important, an individual committed as feeble-minded is eligible for release when his condition “justifies it,” § 22-1814, and an individual civilly committed as mentally ill when the “superintendent or administrator shall discharge such person, or [when] cured of such illness” §22-1223 (emphasis supplied). Thus, in either case release is appropriate when the individual no longer requires the custodial care or treatment or detention that occasioned the commitment, or when the department of mental health believes release would be in his best interests. The evidence available concerning Jackson’s past employment and home care strongly suggests that under these standards he might be eligible for release at almost any time, even if he did not improve. On the other hand, by the terms of his present § 9-1706a commitment, he will not be entitled to release at all, absent an unlikely substantial change for the better in his condition.
  Baxstrom did not deal with the standard for release, but its rationale is applicable here. The harm to the individual is just as great if the State, without reasonable justification, can apply standards making his commitment a permanent one when standards generally applicable to all others afford him a substantial opportunity for early release.
  As we noted above, we cannot conclude that pending criminal charges provide a greater justification for different treatment than conviction and sentence. Consequently, we hold that by subjecting Jackson to a more lenient commitment standard and to a more stringent standard of release than those generally applicable to all others not charged with offenses, and by thus condemning him in effect to permanent institutionalization without the showing required for commitment or the opportunity for release afforded by § 22-1209 or § 22-1907, Indiana deprived petitioner of equal protection of the laws under the Fourteenth Amendment.
  III
  Due Process
  For reasons closely related to those discussed in Part II above, we also hold that Indiana’s indefinite commitment of a criminal defendant solely on account of his incompetency to stand trial does not square with the Fourteenth Amendment’s guarantee of due process.
  A. The Federal System. In the federal criminal system, the constitutional issue posed here has not been encountered precisely because the federal statutes have been construed to require that a mentally incompetent defendant must also be found “dangerous” before he can be committed indefinitely. But the decisions have uniformly articulated the constitutional problems compelling this statutory interpretation.
  The federal statute, 18 U. S. C. §§ 4244 to 4246, is not dissimilar to the Indiana law. It provides that a defendant found incompetent to stand trial may be committed “until the accused shall be mentally competent to stand trial or until the pending charges against him are disposed of according to law.” § 4246. Section 4247, applicable on its face only to convicted criminals whose federal sentences are about to expire, permits commitment if the prisoner is (1) “insane or mentally incompetent” and (2) “will probably endanger the safety of the officers, the property, or other interests of the United States, and . . . suitable arrangements for the custody and care of the prisoner are not otherwise available,” that is, in a state facility. See Greenwood v. United States, 350 U. S., at 373-374. One committed under this section, however, is entitled to release when any of the three conditions no longer obtains, “whichever event shall first occur.” § 4248. Thus, a person committed under § 4247 must be released when he no longer is “dangerous.”
  In Greenwood, the Court upheld the pretrial commitment of a defendant who met all three conditions of § 4247, even though there was little likelihood that he would ever become competent to stand trial. Since Greenwood had not yet stood trial, his commitment was ostensibly under § 4244. By the related release provision, § 4246, he could not have been released until he became competent. But the District Court had in fact applied § 4247, and found specifically that Greenwood would be dangerous if not committed. This Court approved that approach, holding § 4247 applicable before trial as well as to those about to be released from sentence. 350 U. S., at 374. Accordingly, Greenwood was entitled to release when no longer dangerous, § 4248, even if he did not become competent to stand trial and thus did not meet the requirement of § 4246. Under these circumstances, the Court found the commitment constitutional.
  Since Greenwood, federal courts without exception have found improper any straightforward application of §§ 4244 and 4246 to a defendant whose chance of attaining competency to stand trial is slim, thus effecting an indefinite commitment on the ground of incompetency alone. United States v. Curry, 410 F. 2d 1372 (CA4 1969); United States v. Walker, 335 F. Supp. 705 (ND Cal. 1971); Cook v. Ciccone, 312 F. Supp. 822 (WD Mo. 1970); United States v. Jackson, 306 F. Supp. 4 (ND Cal. 1969); Maurietta v. Ciccone, 305 F. Supp. 775 (WD Mo. 1969). See In re Harmon, 425 F. 2d 916 (CA1 1970); United States v. Klein, 325 F. 2d 283 (CA2 1963); Martin v. Settle, 192 F. Supp. 156 (WD Mo. 1961); Royal v. Settle, 192 F. Supp. 176 (WD Mo. 1959). The holding in each of these cases was grounded in an expressed substantial doubt that §§ 4244 and 4246 could survive constitutional scrutiny if interpreted to authorize indefinite commitment.
  These decisions have imposed a “rule of reasonableness” upon §§4244 and 4246. Without a finding of dangerousness, one committed thereunder can be held only for a “reasonable period of time” necessary to determine whether there is a substantial chance of his attaining the capacity to stand trial in the foreseeable future. If the chances are slight, or if the defendant does not in fact improve, then he must be released or granted a §§4247-4248 hearing.
  B. The States. Some States appear to commit indefinitely a defendant found incompetent to stand trial until he recovers competency. Other States require a finding of dangerousness to support such a commitment or provide forms of parole. New York has recently enacted legislation mandating release of incompetent defendants charged with misdemeanors after 90 days of commitment, and release and dismissal of charges against those accused of felonies after they have been committed for two-thirds of the maximum potential prison sentence. The practice of automatic commitment with release conditioned solely upon attainment of competence has been decried on both policy and constitutional grounds. Recommendations for changes made by commentators and study committees have included incorporation into pretrial commitment procedures of the equivalent of the federal “rule of reason,” a requirement of a finding of dangerousness or of full-scale civil commitment, periodic review by court or mental health administrative personnel of the defendant’s condition and progress, and provisions for ultimately dropping charges if the defendant does not improve. One source of this criticism is undoubtedly the empirical data available which tend to show that many defendants committed before trial are never tried, and that those defendants committed pursuant to ordinary civil proceedings are, on the average, released sooner than defendants automatically committed solely on account of their incapacity to stand trial. Related to these statistics are substantial doubts about whether the rationale for pretrial commitment — that care or treatment will aid the accused in attaining competency — is empirically valid given the state of most of our mental institutions. However, very few courts appear to have addressed the problem directly in the state context.
  In United States ex rel. Wolfersdorf v. Johnston, 317 F. Supp. 66 (SDNY 1970), an 86-year-old defendant-committed for nearly 20 years as incompetent to stand trial on state murder and kidnaping charges applied for federal habeas corpus. He had been found “not dangerous,” and suitable for civil commitment. The District Court granted relief. It held that petitioner’s incarceration in an institution for the criminally insane constituted cruel and unusual punishment, and that the “shocking circumstances” of his commitment violated the Due Process Clause. The court quoted approvingly the language of Cook v. Ciccone, 312 F. Supp., at 824, concerning the “substantial injustice in keeping an un-convicted person in . . . custody to await trial where it is plainly evident his mental condition will not permit trial within a reasonable period of time.”
  In a 1970 case virtually indistinguishable from the one before us, the Illinois Supreme Court granted relief to an illiterate deaf mute who had been indicted for murder four years previously but found incompetent to stand trial on account of his inability to communicate, and committed. People ex rel. Myers v. Briggs, 46 Ill. 2d 281, 263 N. E. 2d 109 (1970). The institution where petitioner was confined had determined, “[I]t now appears that [petitioner] will never acquire the necessary communication skills needed to participate and cooperate in his trial.” Petitioner, however, was found to be functioning at a “nearly normal level of performance in areas other than communication.” The State contended petitioner should not be released until his competency was restored. The Illinois Supreme Court disagreed. It held:
  “This court is of the opinion that this defendant, handicapped as he is and facing an indefinite commitment because of the pending indictment against him, should be given an opportunity to obtain a trial to determine whether or not he is guilty as charged or should be released.” Id., at 288, 263 N. E. 2d, at 113.
  C. This Case. Respondent relies heavily on Greenwood to support Jackson’s commitment. That decision is distinguishable. It upheld only the initial commitment without considering directly its duration or the standards for release. It justified the commitment by treating it as if accomplished under allied statutory provisions relating directly to the individual’s “insanity” and society’s interest in his indefinite commitment, factors not considered in Jackson’s case. And it sustained commitment only upon the finding of dangerousness. As Part A, supra, shows, all these elements subsequently have been held not simply sufficient, but necessary, to sustain a commitment like the one involved here.
  The States have traditionally exercised broad power to commit persons found to be mentally ill. The substantive limitations on the exercise of this power and the procedures for invoking it vary drastically among the States. The particular fashion in which the power is exercised — for instance, through various forms of civil commitment, defective delinquency laws, sexual psychopath laws, commitment of persons acquitted by reason of insanity — reflects different combinations of distinct bases for commitment sought to be vindicated. The bases that have been articulated include dangerousness to self, dangerousness to others, and the need for care or treatment or training. Considering the number of persons affected, it is perhaps remarkable that the substantive constitutional limitations on this power have not been more frequently litigated.
  We need not address these broad questions here. It is clear that Jackson’s commitment rests on proceedings that did not purport to bring into play, indeed did not even consider relevant, any of the articulated bases for exercise of Indiana’s power of indefinite commitment. The state statutes contain at least two alternative methods for invoking this power. But Jackson was not afforded any “formal commitment proceedings addressed to [his] ability to function in society,” or to society’s interest in his restraint, or to the State’s ability to aid him in attaining competency through custodial care or compulsory treatment, the ostensible purpose of the commitment. At the least, due process requires that the nature and duration of commitment bear some reasonable relation to the purpose for which the individual is committed.
  We hold, consequently, that a person charged by a State with a criminal offense who is committed solely on account of his incapacity to proceed to trial cannot be held more than the reasonable period of time necessary to determine whether there is a substantial probability that he will attain that capacity in the foreseeable future. If it is determined that this is not the case, then the State must either institute the customary civil commitment proceeding that would be required to commit indefinitely any other citizen, or release the defendant. Furthermore, even if it is determined that the defendant probably soon will be able to stand trial, his continued commitment must be justified by progress toward that goal. In light of differing state facilities and procedures and a lack of evidence in this record, we do not think it appropriate for us to attempt to prescribe arbitrary time limits. We note, however, that petitioner Jackson has now been confined for three and one-half years on a record that sufficiently establishes the lack of a substantial probability that he will ever be able to participate fully in a trial.
  These conclusions make it unnecessary for us to reach petitioner’s Eighth-Fourteenth Amendment claim.
  IV
  Disposition of the Charges
  Petitioner also urges that fundamental fairness requires that the charges against him now be dismissed. The thrust of his argument is that the record amply establishes his lack of criminal responsibility at the time the crimes are alleged to have been committed. The Indiana court did not discuss this question. Apparently it believed that by reason of Jackson’s incompetency commitment the State was entitled to hold the charges pending indefinitely. On this record, Jackson’s claim is a substantial one. For a number of reasons, however, we believe the issue is not sufficiently ripe for ultimate decision by us at this time.
  A. Petitioner argues that he has already made out a complete insanity defense. Jackson’s criminal responsibility at the time of the alleged offenses, however, is a distinct issue from his competency to stand trial. The competency hearing below was not directed to criminal responsibility, and evidence relevant to it was presented only incidentally. Thus, in any event, we would have to remand for further consideration of Jackson’s condition in the light of Indiana’s law of criminal responsibility.
  B. Dismissal of charges against an incompetent accused has usually been thought to be justified on grounds not squarely presented here: particularly, the Sixth-Fourteenth Amendment right to a speedy trial, or the denial of due process inherent in holding pending criminal charges indefinitely over the head of one who will never have a chance to prove his innocence. Jackson did not present the Sixth-Fourteenth Amendment issue to the state courts. Nor did the highest state court rule on the due process issue, if indeed it was presented to that court in precisely the above-described form. We think, in light of our holdings in Parts II and III, that the Indiana courts should have the first opportunity to determine these issues.
  C. Both courts and commentators have noted the desirability of permitting some proceedings to go forward despite the defendant’s incompetency. For instance, § 4.06 (3) of the Model Penal Code would permit an incompetent accused’s attorney to contest any issue “susceptible of fair determination prior to trial and without the personal participation of the defendant.” An alternative draft of § 4.06 (4) of the Model Penal Code would also permit an evidentiary hearing at which certain defenses, not including lack of criminal responsibility, could be raised by defense counsel on the basis of which the court might quash the indictment. Some States have statutory provisions permitting pretrial motions to be made or even allowing the incompetent defendant a trial at which to establish his innocence, without permitting a conviction. We do not read this Court’s previous decisions to preclude the States from allowing, at a minimum, an incompetent defendant to raise certain defenses such as insufficiency of the indictment, or make certain pretrial motions through counsel. Of course, if the Indiana courts conclude that Jackson was almost certainly not capable of criminal responsibility when the offenses were committed, dismissal of the charges might be warranted. But even if this is not the case, Jackson may have other good defenses that could sustain dismissal or acquittal and that might now be asserted. We do not know if Indiana would approve procedures such as those mentioned here, but these possibilities will be open on remand.
  Reversed and remanded.
  Mb. Justice Powell and Mr. Justice Rehnquist took no part in the consideration or decision of this case.
  “9-1706a. Commitment before trial — Subsequent actions. — When at any time before the trial of any criminal cause or during the progress thereof and before the final submission of the cause to the court or jury trying the same, the court, either from his own knowledge or upon the suggestion of any person, has reasonable ground for believing the defendant to be insane, he shall immediately fix a time for a hearing to determine the question of the defendant’s sanity and shall appoint two [2] competent disinterested physicians who shall examine the defendant upon the question of his sanity and testify concerning the same at the hearing. At the hearing, other evidence may be introduced to prove the defendant’s sanity or insanity. If the court shall find that the defendant has comprehension sufficient to understand the nature of the criminal action against him and the proceedings thereon and to make his defense, the trial shall not be delayed or continued on the ground of the alleged insanity of the defendant. If the court shall find that the defendant has not comprehension sufficient to understand the proceedings and make his defense, the trial shall be delayed or continued on the ground of the alleged insanity of the defendant. If the court shall find that the defendant has not comprehension sufficient to understand the proceedings and make his defense, the court shall order the defendant committed to the department of mental health, to be confined by the department in an appropriate psychiatric institution. Whenever the defendant shall become sane the superintendent of the state psychiatric hospital shall certify the fact to the proper court, who shall enter an order on his record directing the sheriff to return the defendant, or the court may enter such order in the first instance whenever he shall be sufficiently advised of the defendant’s restoration to sanity. Upon the return to court of any defendant so committed he or she shall then be placed upon trial for the criminal offense the same as if no delay or postponement had occurred by reason of defendant’s insanity.”
  The section refers at several points to the defendant’s “sanity.” This term is nowhere defined. In context, and in the absence of a contrary statutory construction by the state courts, it appears that the term is intended to be synonymous with competence to stand trial.
  Sections 22-1801 and 22-1907 would appear to be interdependent. See Official Opinion No. 49, Opinions of the Attorney General of Indiana,. Sept. 26,1958.
  See also Association of the Bar, City of New York, Special Committee on the Study of Commitment Procedures and the Law Relating to Incompetents, Second Report, Mental Illness, Due Process and the Criminal Defendant 1 (1968) (hereafter N. Y. Report):
  “The basic and unifying thread which runs throughout our recommendations is a rejection of the notion that the mere fact of a criminal charge or conviction is a proper basis upon which to build other unnecessary, unprofitable, and essentially unfair distinctions among the mentally ill.”
  This case is further discussed in connection with the due process claim. See Part III.
  Perhaps some confusion on this point is engendered by the fact that Jackson’s counsel, far from asserting that the State could not commit him as feeble-minded under § 22-1907, actively sought such a commitment in the hope that Jackson would be assured assignment to a special institution. The Indiana Supreme Court thought this concern unnecessary. In any event, we do not suggest that a feeble-mindedness commitment would be inappropriate. We note only that there is nothing in this record to establish the need for custodial care that such a commitment seems to require under §§ 22-1907 and 22-1801.
  See President’s Committee on Mental Retardation, Changing Patterns in Residential Services for the Mentally Retarded (1969).
  Respondent argues that Jackson would not in fact be eligible for release under § 22-1907 or § 22-1223 if he did not improve since, if the authorities could not communicate with him, they could not decide whether his condition “justified” release. Respondent further argues that because no state court has ever construed the release provisions of any of the statutes, we are barred from relying upon any differences between them. This line of reasoning is unpersuasive. The plain language of the provisions, when applied to Jackson’s particular history and condition, dictates different results. No state court has held that an Indiana defendant committed as incompetent is eligible for release when he no longer needs custodial care or treatment. The commitment order here clearly makes release dependent upon Jackson’s regaining competency to stand trial.
  Petitioner also argues that the ineompetency commitment deprived him of the right to be assigned to a special "institution for feeble-minded persons” to which he would have been statutorily directed by a § 22-1907 commitment. The State maintains two such institutions. The Indiana Supreme Court thought petitioner “failed to understand the statutory mechanisms” for assignment following commitment under the two procedures. 253 Ind., at 490, 255 N. E. 2d, at 517. It observed that since the mental health department now administers, in consolidated fashion, all the State’s mental facilities including the two special institutions, see § 22-5001 to §22-5036, now Ind. Code 16-13-1-1 to 16-13-1-31, 16-13-2-1, 16-13-2-7 to 16-13-2-8, 16-14-18-3 to 16-14-18-4 (1971), and since the special institutions are “appropriate psychiatric institutions” under § 9-1706a, considering Jackson’s condition, his incompetency commitment can still culminate in assignment to a special facility. The State, in argument, went one step further. It contended that in practice the assignment process under all three statutes is identical: the individual is remanded to the central state authority, which assigns him to an appropriate institution regardless of how he was committed.
  If true, such practice appears at first blush contrary to the mandate of § 22-1907, requiring the court clerk to seek assignment at one of the two special institutions. However, the relevant statutes, including that effecting consolidation of all mental health facilities under one department, have been enacted piecemeal, and older laws often not formally revised. Since the department of mental health has sole discretionary authority to transfer patients between any of the institutions it administers at any time, § 22-5032 (6) and § 22-301, there is evidently adequate statutory authority for consolidating the initial assignment decision.
  Moreover, nothing in the record demonstrates that different or better treatment is available at a special institution than at the general facilities for the mentally ill. We are not faced here, as we were in Baxstrom, with commitment to a distinctly penal or maximum-security institution designed for dangerous inmates and not administered by the general state mental health authorities. Therefore, we cannot say that by virtue of his incompetency commitment Jackson has been denied an assignment or appropriate treatment to which those not charged with crimes would generally be entitled.
  Similarly, Jackson’s incompetency commitment did not deprive him of privileges such as furloughs to which he claims a feeble-mindedness commitment would entitle him. The statutes relate such privileges to particular institutions, not to the method of commitment. Thus patients assigned to the Muscatatuck institution are entitled to furloughs regardless of the statute under which they were committed; and persons committed as feeble-minded would not be entitled to furloughs if assigned to a general mental institution.
  Cal. Penal Code §§ 1370, 1371 (1970); Conn. Gen. Stat. Rev. § 54-40 (c) (1958); Minn. Stat. Ann. § 631.18 (Supp. 1972-1973); N. J. Rev. Stat. § 2A: 163-2 (1971); Ohio Rev. Code Ann. §§ 2945.37 and 2945.38 (1954); Wis. Stat. Ann. § 971.14 (1971). See Note, Incompetency to Stand Trial, 81 Harv. L. Rev. 454 (1967).
  Iowa Code Ann. § 783.3 (Supp. 1972); Okla. Stat. Ann., Tit. 22, § 1167 (1958); S. D. Comp. Laws Ann. §23-38-6 (1967).
  Mich. Comp. Laws Ann. § 767.27a (8) (1967); Ore. Rev. Stat. §426.300 (1) (1971); Wis. Stat. Ann. §51.21 (6) (Supp. 1972).
  N. Y. Crim. Proc. Law § 730.60 (1971); see also Ill. Rev. Stat., e. 38, § 104-3 (c) (1971).
  Foote, A Comment on Pre-Trial Commitment of Criminal Defendants, 108 U. Pa. L. Rev. 832 (1960); Note, Incompetency to Stand Trial, 81 Harv. L. Rev. 454-456, 471-472 (1967); N. Y. Report 91-107.
  Judicial Conference of the District of Columbia Circuit, Report of the Committee on Problems Connected with Mental Examination of the Accused in Criminal Cases, Before Trial 49-52, 54-58, 133-146 (1965) (hereafter D. C. Report); N. Y. Report 73-124; Note, supra, 81 Harv. L. Rev., at 471-473.
  See Matthews, Mental Disability and the Criminal Law 138-140 (American Bar Foundation 1970); Morris, The Confusion of Confinement Syndrome: An Analysis of the Confinement of Mentally Ill Criminals and Ex-Criminals by the Department of Correction of the State of New York, 17 Buffalo L. Rev. 651 (1968); McGarry & Bendt, Criminal vs. Civil Commitment of Psychotic Offenders: A Seven-Year Follow-Up, 125 Am. J. Psychiatry 1387, 1391 (1969) : D. C. Report 50-52.
  Note, supra, 81 Harv. L. Rev., at 472-473; American Bar Foundation, The Mentally Disabled and the Law 415-418 (rev. ed. 1971) (hereafter ABF Study); N. Y. Report 72-77, 102-105, 186— 190.
  See generally ABF Study 34-59.
  Id., at 36-49. The ABF Study shows that in nine States the sole criterion for involuntary commitment is dangerousness to self or others; in 18 other States the patient’s need for care or treatment was an alternative basis; the latter was the sole basis in six additional States; a few States had no statutory criteria at all, presumably leaving the determination to judicial discretion.
  See Note, Civil Restraint, Mental Illness, and the Right to Treatment, 77 Yale L. J. 87 (1967).
  See Note, Civil Commitment of the Mentally Ill: Theories and Procedures, 79 Harv. L. Rev. 1288, 1289-1297 (1966).
  In 1961, it was estimated that 90% of the approximately 800,000 patients in mental hospitals in this country had been involuntarily committed. Hearings on Constitutional Rights of the Mentally Ill before the Subcommittee on Constitutional Rights of the Senate Committee on the Judiciary, 87th Cong., 1st Sess., pt. 1, pp. 11, 43 (1961). Although later U. S. Census Bureau data for 1969 show a resident patient population almost 50% lower, other data from the U. S. Department of Health, Education, and Welfare estimate annual admissions to institutions to be almost equal to the patient population at any one time, about 380,000 persons per annum. See ABF Study xv.
  Cf. Powell v. Texas, 392 U. S. 514 (1968); Robinson v. California, 370 U. S. 660 (1962).
  In re Harmon, 425 F. 2d 916, 918 (CA1 1970).
  In this case, of course, Jackson or the State may seek his commitment under either the general civil commitment statutes or under those for the commitment of the feebleminded.
  One doctor testified that Jackson “probably knows in a general way the basic differences between right and wrong.” The other doctor agreed, but also testified that Jackson probably had no grasp whatsoever of abstract concepts such as time, “like simple things of yesterday and tomorrow.”
  People ex rel. Myers v. Briggs, 46 Ill. 2d 281, 287-288, 263 N. E. 2d 109, 112-113 (1970); United States ex rel. Wolfersdorf v. Johnston, 317 F. Supp. 66, 68 (SDNY 1970); United States v. Jackson, 306 F. Supp. 4, 6 (ND Cal. 1969); see Foote, supra, n. 14, at 838—839; D. C. Report 145-146 (Recommendation No. 16).
  See cases cited in n. 27; N. Y. Report 119-121 (Recommendation No. 15); D. C. Report 52-53; Model Penal Code §4.06(2) (Proposed Official Draft 1962).
  People ex rel. Myers v. Briggs, supra, at 288, 263 N. E. 2d, at 113; Neely v. Hogan, 62 Misc. 2d 1056, 310 N. Y. S. 2d 63 (1970); N. Y. Report 115-123 (Recommendation No. 13); D. C. Report 143144 (Recommendation No. 15); Foote, supra, n. 14, at 841-845; Model Penal Code § 4.06 (alternative subsections 3, 4) (Proposed Official Draft 1962); ABF Study 423.
  Wis. Stat. Ann. §971.14 (6) (1971); N. Y. Crim. Proc. Law § 730.60 (5) (1971); Mass. Gen. Laws, c. 123, §17 (Supp. 1972); Mont. Rev. Code Ann. § 95-506 (c) (1969); Md. Ann. Code, Art. 59, §24 (a) (1972). See Reg. v. Roberts, [1953] 3 W. L. R. 178, [1953] 2 All. E. R. 340 (Devlin, J.).
  See Pate v. Robinson, 383 U. S. 375 (1966); Bishop v. United States, 350 U. S. 961 (1956).
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