[77]*77LINDE, J.
Plaintiff was arrested on March 13, 1978 and indicted on March 16, 1978, on a charge of murder. For the two and one-half years since her arrest she has been held in the Lane County jail awaiting trial. Her motions to be released on appropriate security were denied on October 6, 1978 and August 30, 1979, and a motion to dismiss or alternatively to set security was denied on February 21, 1980. In the present habeas corpus proceeding, plaintiff asks to be released from imprisonment on two grounds, claiming first that the denial of a security release contravened the governing law, and second, that she has been denied a speedy trial and is entitled to have the charge against her dismissed.1 The two issues are related as set out below.
I. The governing legal standards.
Security release. The detention of a defendant pending trial is governed by ORS 135.230 to ORS 135.295 and ORS 135.750, within the limits imposed by article I, section 14 of the constitution. A charge of murder is an exception to the general rule that all defendants "shall be released” upon personal recognizance, conditional release, or deposit of security. See Knutson v. Cupp, 287 Or 489, 601 P2d 129 (1979). ORS 135.240 provides:
"(1) Except as provided in subsection (2) of this section, a defendant shall be released in accordance with ORS 135.230 to 135.290.
"(2) When the defendant is charged with murder or treason, release shall be denied when the proof is evident or the presumption strong that the person is guilty.
"(3) The magistrate may conduct such hearing as he considers necessary to determine whether, under subsection (2) of this section, the proof is evident or the presumption strong that the person is guilty.”
[78]*78The exception in subsection (2) essentially restates the constitutional rule.2
Shortly before the statutory revision of release procedures in 1973, this court examined the question of denying bail upon "evident proof’ or "strong presumption” of murder. State ex rel Connall v. Roth, 258 Or 428, 482 P2d 740 (1971). There defendants charged with murder were admitted to bail when the prosecutor had relied only on the indictment as the basis to deny bail. The prosecutor sought mandamus to set aside the circuit court’s orders, but this court dismissed the 'writ. The fact that a grand jury, in closed proceedings, had been presented sufficient evidence to find probable cause for an indictment was held not to show the level of proof or presumption required to deny bail. Rather, the state’s burden is to persuade the magistrate by other competent evidence that the proof or presumption of guilt is evident or strong. 258 Or at 433, 435.
The responsibility for evaluating the strength of the state’s evidence rests on the court hearing the motion for release. 258 Or at 435.3 In the course of stating this holding, the Connall court quoted from a New Jersey opinion the phrase that the evidence must show "a fair likelihood” that defendant would be convicted of murder. The quoted phrase illustrates the risk of the common temptation to explain one set of adjectives by a different one. The words "strong” and "evident” may be said to demand more than "a fair likelihood.” So the revisers of the release statutes concluded. The original draft of ORS 135.240 proposed to include the Connall phrase "when circumstances indicate a fair likelihood of conviction,” but this was deleted as inconsistent with the constitutional test. See [79]*79Snouffer, An Article of Faith Abolishes Bail in Oregon, 53 Or L Rev 273, 281-282 (1974) and sources cited in note 69. The likelihood of guilt must be more than "fair,” it must be "strong,” before release can be denied under ORS 135.240(2). It must, of course, be guilt specifically of murder, not merely of some degree of culpable homicide. While for this purpose guilt need not be shown "beyond a reasonable doubt,” as it must for conviction, the evidence should at least be clear and convincing. See Thaler, Punishing the Innocent: The Need for Due Process and the Presumption of Innocence Prior to Trial, 1978 Wise L Rev 441.
Trial delay. Three different sources place legal limits on the lapse of time before a defendant must be tried. Their relationship among themselves and with the law governing pretrial detention is complex.
The criminal code commands expeditious prosecution. Once a suspect is held to answer for a crime, an indictment or information must be filed within 30 days or risk dismissal of the prosecution for delay. ORS 135.745. Once charged, a defendant "whose trial has not been postponed upon his application or by his consent” must be tried "within a reasonable period of time” or the court must dismiss the accusatory instrument. ORS 135.747. If sufficient reasons are shown for a failure of timely action under the preceding provisions, then the court may order a continuance and release the defendant from custody "as provided in ORS 135.230 to 135.290.” ORS 135.750. In many cases application of these rules will satisfy constitutional requirements and obviate any constitutional issue. However, the statutes allow a new prosecution if the charge dismissed for delay was a felony or Class A misdemeanor. ORS 135.753(2).4 And the release during continuance prescribed by ORS 135.750 is not available to a murder defendant when the facts meet the statutory and constitutional standard stated above. He or she will be released only when an unreasonable delay leads to an order of dismissal.
[80]*80 The constitutional standards governing trial delay are found in article I, section 10, of Oregon’s Constitution and in the "speedy trial” guarantee of the federal sixth amendment, part of the due process required of states under the fourteenth amendment.5 In some respects these provisions are not identical. The Oregon Constitution commands that "justice shall be administered . . . without delay” in all proceedings, not only in criminal prosecutions. See Hooton v. Jarman Chevrolet Co., 135 Or 269, 293 P 604, 296 P 36 (1931). Also, unlike the sixth amendment, article I, section 10, states not a "right” of the accused but a mandatory directive not within the disposal of the parties, a difference that can bear on the enforcement of the constitutional command. State ex rel Oregonian Pub. Co. v. Deiz, 289 Or 277, 613 P2d 23 (1980).6 "Contrary to the rule in most of the jurisdictions of the country, this court has consistently held that it is not incumbent upon the accused to demand a trial or take affirmative action to enforce his right to a speedy trial.” State v. Vawter, 236 Or 85, 87, 386 P2d 915 (1963). But the conditions of an unconstitutional "delay” in a criminal prosecution do not differ materially from the denial of a "speedy trial” under the sixth amendment. State v. Ivory, 278 Or 499, 564 P2d 1039 (1977).
As stated in Ivory, a decision under either standard involves consideration of a number of circumstances or "factors” which have been identified in past decisions of this court and of the United States Supreme Court under the sixth amendment. As brought together in Barker v. Wingo, 407 US 514, 92 S Ct 2182, 33 L Ed 2d 101 (1972), for purposes of that amendment, they include the length of the delay, the reason for the delay, the prejudicial consequences of the delay, and the evidence of concern about these consequences shown by defendant’s assertion of a [81]*81demand for trial. 407 US at 530-532. There these elements or "factors” of decision are stated in the current formula of "balancing,” but the metaphor should not be taken too literally. We know no scales that provide a common denominator for the "weight” of an extra month’s pretrial imprisonment and the "weight” of0 prosecution neglect, or good faith necessity, or deliberate delay. The point of the formula is that all relevant criteria be examined and none overlooked or ignored. State v. Ivory, 278 Or at 505. The proper disposition in the individual case is not a question of addition and subtraction but of examining the relevance of each element in giving effect to the constitutional guarantee.
It is apparent that different factors are important to the substance of the constitutional command and to the remedy of dismissal. As already stated, Article I, section 10, addresses the administration of justice and protects interests of the public as well as the rights of defendants. Thus, whether there has been compliance with the constitutional injunction against "delay” does not itself depend on prejudice to the defendant. Nor does it depend on defendant’s demand for a trial. State v. Vawter, supra. Compliance as such depends on the length of the delay and the reasons for it. Some cases involve longer periods of preparation and pretrial procedures than others. Even with such reasons, no doubt the passage of time alone can eventually lengthen to unconstitutional dimensions. See State v. Ivory, 278 Or at 506. But short of this, a failure to bring a defendant to trial is a "delay” of justice when it has no reason other than neglect, procrastination, or deliberate choice.
The urgency of a speedy trial becomes greater when the accused is jailed while awaiting trial. Both constitution and code recognize pretrial imprisonment itself, sometimes necessary, to be a heavy burden on one not convicted of crime, apart from its possible consequences for the accused’s job, or family and community relationships, or her physical or psychological health. ORS 135.230 to ORS 135.290, Or Const art I, § 14 supra. See Thaler, supra, 1978 Wise L Rev at 450-459, and sources cited therein. Thus pretrial imprisonment bears on the length of the "reasonable time” to bring the accused to trial, ORS [82]*82135.747, or the constitutionally impermissible "delay,” article I, section 10, even apart from a prejudicial impact on the accused’s defense. Similarly, a significant possibility that delay will impair the defense7 increases the urgency of speedy trial even when the accused is not in custody. Obviously, that urgency is at its highest when both pretrial imprisonment and possible impairment of the defense coincide.
Remedies. This case differs from the usual appeal claiming a denial of a speedy trial because it comes to us before trial. This requires a more differentiated consideration of the element of prejudice than is true in the decision of such appeals. For on appeal from a conviction, the question of prejudice resulting from the delay can be examined retrospectively, though perhaps not with absolute certainty, and when a conviction is set aside for that reason, the reason by hypothesis precludes a later retrial. Thus a reasonable possibility that delay will impair the defense is the proper prospective test for deciding that a case must proceed to trial, while a retrospective claim that a conviction must be reversed for delay reasonably calls for showing a more concrete likelihood that the delay was prejudicial to the defense.
In a federal appeal under the sixth amendment, the United States Supreme Court has stated that "dismissal must remain, as Barker noted, The only possible remedy.’ ” Strunk v. United States, 412 US 434, 440, 93 S Ct 2260, 37 L Ed 2d 56 (1973). This is true when one element rendering the delay unconstitutional is prejudice to the accused’s ability to defend himself, and perhaps also when dismissal is invoked against purposeful delay by the government even when no actual prejudice is shown. State v. Ivory, 278 Or at 506. The quoted statement in Strunk has been criticized as overly broad. Amsterdam, Speedy Criminal Trials: Rights and Remedies, 27 Stan L Rev 525 (1975).8 [83]*83Short of the kind of prejudice, extreme delay, or purposeful prosecution obstruction for which the Supreme Court would require dismissal, there is no reason why pretrial remedies should not include mandatory orders, as in State ex rel Oregonian Pub. Co. v. Deiz, supra, or release under ORS 135.750, if continued custody is the element that renders further delay unconstitutional, or dismissal without prejudice, as provided in ORS 135.745 and 135.747.
In sum, Oregon law requires trial "without delay” and provides for the dismissal of the accusatory instrument if a defendant, without his application or consent, is not brought to trial "within a reasonable period of time.” Upon sufficient reasons, the court may substitute a continuance and release from custody.
These standards and remedies apply in advance of a constitutional issue. If they did not apply to a delay short of a constitutional violation requiring final dismissal, the statutory provisions for a dismissal subject to renewal of the prosecution would be meaningless. However, prolonged pretrial imprisonment, which can result from denial of release in a murder case when the proof is strong, shortens the constitutionally permissible measure of delay. And insofar as the statutory dismissal of charges does not bar renewed charges in the case of serious crimes, it may not be [84]*84an adequate remedy when the delay reaches unconstitutional dimensions.
II. Application to this case.
The denial of release. Plaintiff’s claims for release for denial of a speedy trial and for lack of an evidentiary basis that would preclude a security release are related insofar as her continued detention bears on the "reasonable time” to bring her to trial. We deal with them separately.
Plaintiff first contends that she was and is entitled to be released on appropriate security because the proof of her guilt is not so strong as to preclude this. The circuit court’s order denying plaintiff’s release relied on evidence that the same judge had previously heard in an omnibus hearing under ORS 135.037, and the parties have made the transcript of these several hearings part of the record on habeas corpus. As stated above, primary responsibility for evaluating the strength of the state’s evidence rests on the court hearing the motion for release, and this conclusion must reflect the correct standards both as to the command of that section and as to the evidence to be considered.
Plaintiff claims that the circuit court’s original order in October, 1978, applied the wrong standard when it refused to set security on a finding "that the circumstances presented at the omnibus hearing indicate that the defendant is in danger of being convicted of murder.” The state concedes that this finding contains "unfortunate language,” but it contends that the court later corrected the error. The difference between the Connall phrase and the statutory and constitutional test, discussed above, was brought to the circuit court’s attention when plaintiff renewed her motion to set security in July, 1979. In ruling on this motion on August 27, 1979, the court agreed that the statute requires more than a likelihood of conviction to preclude pretrial release and went on to state that "more than just a fair likelihood” had been shown. This was stated in terms of a probable jury verdict rather than the court’s independent assessment of the strength of the evidence that the statute calls for. However, this discrepancy is not decisive on this phase of the case.
[85]*85The case is not before us on appeal from the circuit court, and the question is not one of error as such. Nor has plaintiff sought a writ of mandamus, as in State ex rel Ricco v. Biggs, 198 Or 413, 255 P2d 1055 (1953).9 On a writ of habeas corpus, when the prisoner is held under an order of the court, the question is whether it appears from the order itself or from undisputed facts that her imprisonment was unlawful or in the course of events has become so. ORS 34.610 (in this case, subsection (2));10 Owens v. Duryee, 285 Or 75, 589 P2d 1115 (1979).
That is not the case here. Although there may be some doubt of the circuit court’s legal premises, as stated above and as will be mentioned later, this does not appear from the order itself. As to the strength of the evidence of plaintiffs guilt, the facts are not undisputed. Prom our own examination of the stipulated record, we cannot say that a judge could not reasonably consider the evidence of plaintiff’s guilt to be strong. Accordingly, plaintiff is not entitled to release under the writ of habeas corpus on this issue.
[86]*86The speedy trial claim. As stated in Part I, we examine, first, whether there has been unreasonable delay, and if so, whether by virtue of prejudice to the defense or deliberate obstruction by the state the remedy must be a final dismissal of the prosecution. Ultimately the answer depends in part on whether it is certain that plaintiff cannot be released. That answer cannot be given with finality on the present record.
Plaintiff has been jailed continuously for two and one-half years while awaiting trial. That is on its face an extraordinary length of time to wait for a "speedy trial,” unless, of course, plaintiff herself is responsible for much of the delay. This is an issue because a significant part of the time has been occupied with an appeal taken by the state from the suppression of certain evidence ordered at the omnibus hearing.
The pertinent dates are the following:
Plaintiff was arrested on March 13, 1978, and indicted on March 16, 1978. On the same day, she filed a motion for an omnibus hearing pursuant to ORS 135.037, demanding the suppression of allegedly inadmissible evidence against her. The hearing was held on June 22 to June 29, 1978, and continued on defendant’s motion until September 7, 1978. Meanwhile, two trial dates had been set in July, 1978, and postponed for a mental examination of the accused.
On September 11, 1978, the circuit court ordered the suppression of some of the state’s evidence, in particular, videotapes of a reenactment of the crime by the other two defendants "and evidence directly related to the showing of the videotapes.”11 On September 14, the state filed notice of appeal of the suppression order under ORS 138.060. While an accused has no direct appeal from an adverse order, ORS 138.060 provides for a cross-appeal when the state appeals, and plaintiff filed such a cross-appeal on October 11, 1978.
The Court of Appeals decided the appeal nine months later, on July 30, 1979. Its conclusion was that [87]*87because of "critical inadequacies and ambiguities” in the circuit court’s order, the court could not "review the critical portions of the order because we cannot understand them.” State v. Haynes, 41 Or App 321, 328-329, 597 P2d 1297 (1979). It therefore remanded those parts of the order to the circuit court for clarification, affirming the rest. Plaintiff petitioned this court for review of that decision, which was denied on October 16, 1979.
On November 26, 1979, the circuit court amended its previous order of suppression but again suppressed the videotapes and evidence relating thereto. The state again appealed this order on December 21, 1979, with a cross-appeal by the accused filed on January 18, 1980. This appeal was argued in the Court of Appeals on June 23, 1980, and has not been decided. Meanwhile, on February 15, 1980, the circuit court held another hearing on plaintiff’s motion to dismiss the prosecution or in the alternative to release her. It denied the motion on February 21, 1980.
It is apparent from this sequence of events that the first six months, until September 14, 1978, were occupied primarily with proceedings on defense motions, including the omnibus hearing. For the two years since that date the trial of the charge against plaintiff has awaited the disposition of the state’s appeal from the circuit court’s suppression order. If apart from the appeal there might have been other reasons for delay, the record does not show them.
The state does not squarely claim in this court that plaintiff has herself to blame for this delay because she triggered the proceeding by her motion to suppress, and we decline such a holding.12 Rather, the state asserts that [88]*88plaintiff lengthened the delay on appeal by the time consumed for her notices of cross-appeal, by obtaining extensions of time to file briefs, and by petitioning this court to review the July, 1979 decision of the Court of Appeals. Assuming for purposes of the argument that plaintiff thus is responsible for about 151 days of the appeal period, this still leaves an elapsed time of approximately 19 months since the conclusion of the omnibus hearing that cannot be laid to any request of plaintiff, and seven months since she moved for release or dismissal specifically on grounds of delay.
From the principles discussed previously, it follows that if the accused continues in custody, any further postponement of her trial will no longer be "trial within a reasonable period of time” in the sense of ORS 135.747. That statute requires dismissal of the accusatory instrument without prejudice to a renewed prosecution, ORS 135.753(2), if the accused cannot be either tried or released on security. And any decision on pretrial release, in turn, depends on the circuit court’s assessment of the strength of the evidence that she is guilty of murder.
As discussed in the preceding section, the circuit court denied plaintiff’s request for security release in the belief that this was precluded by ORS 135.240(2). We there explained that the writ of habeas corpus would not be used to look to the reasons behind the court’s order as long as the undisputed facts did not show the order to be contrary to law. But this does not preclude the circuit court itself from reexamining that order upon a further consideration of the applicable standards.
The stipulated record shows that the court correctly assumed that something less than a trial of the prosecution’s entire case was called for. As stated in Con-nail, "[t]he bail hearing is not for a determination of guilt or innocence, but rather a determination of the preliminary issue of the right to bail.” 258 Or at 435. Nevertheless, the evidence adduced at the hearing as precluding pretrial release must be sufficient to support a finding that the "proof’ is "evident” or gives rise to a "strong” presumption [89]*89of guilt.13 But it is not certain that the court made such a finding entirely on the evidence before it at the hearing. Rather, the judge stated:
"It would appear to me that the hearing for release is rather a broad hearing at which statements made by the District Attorney as to what proof the District Attorney’s office feels they may be able to introduce can be taken into consideration by the Court or magistrate.”
A prosecutor’s assertions about evidence that he "feels” he "may be able to introduce” are not "proof.” The magistrate must be shown information at the hearing from which he can make his own independent determination whether there is admissible evidence against an accused that adds up to strong or evident proof of guilt. The same applies to the court’s further statement that it took into account the conviction of another defendant, which had been reversed, and the guilty plea of a third. Without an explanation how another person’s conviction of a crime could be used against a defendant charged with the same crime, this fact can hardly be part of the "proof” that precludes pretrial release.
To repeat, the question is not one of appellate review for error. Rather it is whether this court can assume that the circuit court has reached an independent judgment that evidence which will be admissible at trial, unless met or explained, so strongly shows the accused guilty of murder that the law forbids her pretrial release on adequate security conditions. In view of what we have said, we are confident that the circuit court would make that judgment upon this proper standard and evidence if a motion for security release were to be renewed.
As previously noted, plaintiff’s continued detention bears on whether she is being brought to trial within a "reasonable period of time” under ORS 135.747. However, we do not now decide that plaintiff is entitled to a final [90]*90dismissal of the charge against her for lack of a speedy trial. As stated above, short of an extreme and wholly unjustified passage of time, that remedy is required when there has been purposeful prosecution delay or probable prejudice to the defense. There is no question of bad faith on the part of the prosecution, but plaintiff has raised the issue that the delay has adversely affected her defense.
What evidence we have on that issue appears in the record of the February, 1980, hearing. It relates partly to the asserted loss of defense witnesses and partly to the condition of the accused herself. An investigator for the defense testified, without elaboration, that plaintiff’s mother, who suffered from terminal cancer, could testify to matters material to the defense. Plaintiff asserts, without contradiction, that her mother has since died. The investigator also testified that other witnesses whom he had previously located had moved and might be difficult to find. Plaintiff herself testified that her lengthy imprisonment had caused her to become depressed with worry about her children and other emotional difficulties and to lose interest in cooperating in her defense, at one point wishing to discharge her attorney. There was supporting testimony from the investigator and from a psychiatrist employed by the county corrections division, who treated plaintiff for anxiety and depression.
While this evidence reinforces plaintiff’s case for a speedy trial, it does not establish that a fair trial is now no longer possible so as to entitle plaintiff to dismissal of the prosecution upon the present writ. The hearing was held more than seven months ago, and additional or different evidence concerning the potential effect of the delay on plaintiff’s defense may have developed. Like the strength of the evidence of guilt to which we have referred previously, this also is the kind of evidence that can best be evaluated by a trial court in the first instance. Plaintiff’s claim can be renewed and, if necessary, preserved on appeal. If the delay is found before or at trial to have created a reasonable possibility of prejudice to plaintiff’s defense, it is the court’s responsibility to dismiss the case. Cf. State v. Jenkins, 29 Or App 751, 565 P2d 758 (1977), applying the rule of State v. Ivory, supra, 29 Or App at 760. If the [91]*91accused is neither released nor tried as soon as practical, her petition for a writ of habeas corpus can be renewed. Meanwhile, plaintiff is remanded to the custody of defendant.
Plaintiff remanded.