Levin, J.
Paul Dye was convicted on retrial of two counts of first-degree murder1 and two counts of possession of a firearm during commission of a felony.2 Dye’s first trial was declared a mistrial, with the jury voting eleven to one to acquit him on the first-degree murder charges.3 At the first trial the testimony of three witnesses — fellow members of a motorcycle club — provided the only evidence that Dye was the killer. At Dye’s retrial the prosecution did not produce these three witnesses. The trial court allowed assistant prosecutors to read the witnesses’ earlier testimony to the jury.
This appeal presents two questions. The first is whether the prosecution showed due diligence in attempting to produce the three witnesses for the second trial. The three witnesses were in protective custody immediately preceding and until they completed their testimony at the first trial, and were then released. Subsequent efforts to locate [62]*62the witnesses for the second trial were tardy and incomplete. We reverse and remand for a new trial.
The second question concerns evidentiary issues. The prosecution in its case in chief elicited testimony from the three witnesses and Richard Troher that Dye had not accused anyone else of committing the killings and had failed to make a statement to the police. On retrial the prosecution may not in its case in chief ask Troher whether Dye accused another of the killings, or inquire on direct examination whether Dye made a statement to the police.
i
Early in the morning of August 29, 1982, two women were killed in the clubhouse of the Forbidden Wheels Motorcycle Club. They had each been shot through the head. Their bodies were dumped on the curb of a residential street and discovered there by early morning commuters.
Four club members were in the clubhouse at the time of the murders. Dye, Bruce Seidel, James Dawson, and Steve Stever all admitted to helping clean up the clubhouse after the killings. Seidel, the prosecution’s chief witness, accused Dye of killing the women. Dye accused Seidel of being the killer.4 Dawson and Stever, who had been in an [63]*63upstairs apartment apparently asleep at the time of the killings, testified that Seidel walked upstairs, awakened them, and told them that Dye had just killed two women. Seidel, Dawson, and Stever further testified that after Seidel and Dye dumped the bodies, all four met in Stever’s garage, where Dye admitted to the killings.5
Seidel, Dawson, and Stever testified under a limited grant of immunity.6 All three left the state after the killings, and returned to Michigan to testify at the first trial. Upon their return they were kept in protective custody until after they completed their testimony to prevent other "bikers” from harming them. The prosecution failed to produce any of the three to testify at the second trial.
[64]*64II
A
The Sixth Amendment of the United States Constitution, and art 1, § 20 of the Michigan Constitution of 1963, provide in part that in all criminal prosecutions the accused shall "be confronted with the witnesses against him . . . .”7 The United States Supreme Court has emphasized that the purpose of the Confrontation Clause is to provide for a face-to-face confrontation between a defendant and his accusers at trial.8 9This confrontation is an important right of the defendant because it enables the trier of fact to judge the witnesses’ demeanors. The Court in Ohio v Roberts, 448 US 56, 63-64; 100 S Ct 2531; 65 L Ed 2d 597 (1980), declared:
[T]he Clause envisions "a personal examination and cross-examination of the witness in which the accused has an opportunity, not only of testing the recollection and sifting the conscience of the witness, but of compelling him to stand face to face with the jury in order that they may look at him, and judge by his demeanor upon the stand and the manner in which he gives his testimony whether he is worthy of belief. ”[9]
Demeanor evidence is important. As the Third [65]*65Circuit Court of Appeals noted in Virgin Islands v Aquino, 378 F2d 540, 548 (CA 3, 1967):
Demeanor is of the utmost importance in the determination of the credibility of a witness. The innumerable telltale indications which fall from a witness during the course of his examination are often much more of an indication to judge or jury of his credibility and the reliability of his evidence than is the literal meaning of his words. Even beyond the precise words themselves lies the unexpressed indication of his alignment with one side or the other in the trial. It is indeed rarely that a cross-examiner succeeds in compelling a witness to retract testimony which is harmful to his client, but it is not infrequently that he leads a hostile witness to reveal by his demeanor — his tone of voice, the evidence of fear which grips him at the height of cross-examination, or even his defiance— that his evidence is not to be accepted as true, either because of partiality or overzealousness or inaccuracy, as well as outright untruthfulness. The demeanor of a witness, as Judge Frank said, is "wordless language.” Broadcast Music, Inc v Havana Madrid Restaurant Corp, 175 F2d 77, 80 (CA 2, 1949).
A transcript of prior testimony may nevertheless be offered in evidence upon a showing that the witness is unavailable and that the testimony bears satisfactory indicia of reliability.10_
[66]*66To establish the witness’ unavailability, the proponent* 11 must establish that he has made a diligent, good-faith effort to obtain the witness’ presence at trial.12 This is a substantial requirement. "[I]f there is a possibility, albeit remote, that affirmative measures might produce the declarant, the obligation of good faith may demand their effectuation.”13
In Motes v United States, 178 US 458; 20 S Ct 993; 44 L Ed 1150 (1900), the United States Supreme Court held that police negligence barred a finding of good-faith diligent effort. A codefendant in a murder prosecution had provided the primary evidence against the other defendants in testimony at a preliminary examination. Prior to trial he escaped due to the negligence of the police. At trial the judge admitted the preliminary examination testimony as substantive evidence against the remaining defendants. The United States Supreme Court reversed, stating:
We are unwilling to hold it to be consistent with the constitutional requirement that an accused shall be confronted with the witnesses against him, to permit the deposition or statement of an absent witness (taken at an examining trial) to be read at the final trial when it does not appear that the witness was absent by the suggestion, connivance or procurement of the accused, but does [67]*67appear that his absence was due to the negligence of the prosecution. [178 US 474.]
B
Whether the prosecution made a diligent, good-faith effort to produce missing witnesses is an evaluation that depends on the particular facts of each case. The record in the instant case indicates that, in the circumstances of this case, the prosecution failed to make such a diligent, good-faith effort to produce Seidel, Dawson, and Stever.
Seidel, Dawson, and Stever had been difficult to locate for the first trial. The officer in charge, Kuhnlein, testified that when the three were released, he knew that each was going out of state. All three had an incentive to go into hiding. They were in protective custody during the first trial to prevent other "bikers” from harming them for testifying against Dye. This threat remained after their release. Additionally, the witnesses may have feared prosecution; they had been given only limited immunity. All three were admitted accomplices after the fact in the murders. Stever and Dawson were suspects in a related firebombing.14
The mistrial was declared on March 17, 1983. On May 13, 1983, the court set Dye’s retrial for August 22, 1983. As of May 13, the witnesses had been released for approximately two months. During this two-month period, the prosecution had made no effort to relocate Seidel, Dawson,15 or Stever even though the prosecution knew that the witnesses were needed, they had expressed an [68]*68intention to leave the state, and had incentives to go into hiding. And once the prosecution learned of the retrial date, its efforts to produce the witnesses were, in the circumstances of this case, tardy and incomplete. These efforts are detailed below.
l
An assistant prosecutor testified that during March, April, and early May of 1983, Dawson repeatedly telephoned to ask whether and when Dye was going to be released on bond. Because Dawson had testified against Dye, he may have feared Dye would seek revenge. Dye was released on June 17, 1983. The prosecution did not attempt to communicate with Dawson until four weeks after Dye’s release. The prosecution telephoned Dawson on July 12 and learned that his telephone line had been disconnected. No investigation into Dawson’s whereabouts, however, was conducted until August 5 — three weeks later, and just seventeen days before the retrial date — when the prosecution attempted to serve a subpoena on Dawson at a Detroit address.
The woman answering the door reported that she had purchased the house from Dawson three weeks before and that she had no idea where he was. It does not appear that any effort was made to communicate with the lawyer, real estate agent, or bank involved in the house sale. Had the prosecution investigated immediately upon learning on July 12 that Dawson’s phone had been disconnected, they would — according to the date given by the woman who purchased the house — have arrived at the house before the sale was completed [69]*69and while Dawson might have still been in the area.
Dawson’s wife was a postal employee.16 Through her employer the prosecution obtained a forwarding address in Cucamonga, California. On August 5, 1983 — -just seventeen days before Dye’s retrial— the prosecution mailed to the California district attorney for Cucamonga a certificate under the uniform act to secure the attendance of witnesses from without a state in criminal proceedings,17 requesting that the prosecutor serve and arrest Dawson. The assistant prosecutor did not communicate with the California district attorney again until August 16 — less than a week before Dye’s retrial — when he learned that the California district attorney had received the certificate but had not yet served Dawson. The record does not indicate that the California district attorney had even begun looking for Dawson. Also on August 16, the assistant prosecutor mailed a photograph of Dawson to the California district attorney. On August 18, four days before Dye’s retrial, the California district attorney telephoned and said that while Dawson had apparently been living at the Cucamonga address, he was not there at the time the investigators visited. They thought that Dawson had a job lead in the area and said they were going to continue trying to locate him. There is no evidence of any further efforts by the California authorities or of further communication between the prosecution and the California district attorney after the August 18 phone call.18
It thus appears that although both Dawson and [70]*70his wife were living at an identified address in California, the only effort of record to locate him was a single visit by California investigators to that address. The record does not indicate on what day or at what time that visit occurred. There is no reason to conclude that further efforts to locate Dawson or his wife at that address would have been of no avail.
The prosecution did not attempt to communicate with Seidel, the sole eyewitness, until June 2— almost three months after Seidel’s release and almost a month after the date for Dye’s retrial had been set — when it sent a request for information to the police department of Mason City, Iowa, where Seidel had previously lived with his mother.
The Mason City police telephoned Seidel’s mother and reported that, according to his mother, Seidel was working out of town and that when he returned his mother would give him the message to call the assistant prosecutor. This request was apparently repeated on June 22, and the assistant prosecutor apparently received the same response. On July 7, the prosecution telephoned Mrs. Seidel directly. She made the same response she had made to the Mason City police.
Although it had clearly been established by July 7 that Seidel was missing, there was no further communication with his mother or any visit to his mother’s home until approximately six weeks later —about August 16, less than one week before Dye’s retrial — when the prosecution apparently called the district attorney for Mason City and learned that he had received a certificate forwarded by the prosecution on August 5 under the [71]*71uniform act for Seidel.19 Some time after receipt of the certificate members of the Mason City police visited the house, and it appears that they believed that Seidel was living there.
Also on August 16, the prosecution mailed a photograph of Seidel to the local district attorney. There is no evidence of any further communication between the prosecution and the local district attorney.
It does not appear that the Mason City police made more than one visit to the Seidel home. Seidel was the prosecution’s most important witness. Yet the prosecution did not send an investigator to Mason City or ask the Mason City police to exert further efforts to locate him.
The prosecution did not suggest checking, nor did the local police — as to Seidel, Dawson, or Stever — check, locales frequented by bikers. Seidel was in fact arrested by Iowa police on another charge one week after Dye’s retrial ended.
Stever apparently left the state several days after being released.20 The prosecution did not attempt to locate Stever until August 1 — four and a half months after the mistrial was declared and just three weeks before Dye’s retrial was scheduled to begin — when Officer Kuhnlein attempted to serve Stever with a subpoena at a local home address. The man who answered the door was renting the house, said that he had not seen Stever for some time, and thought that he had gone either to Wisconsin, Tennessee, or California. The tenant was about to leave because he had learned that the house was to be repossessed.
[72]*72On August 5, seventeen days before Dye’s retrial, the prosecution mailed to the Livingston, Tennessee, district attorney a certificate under the uniform act for Stever. Stever had traveled from Livingston to Detroit to testify at the first trial, but there was little or no reason to believe that he had returned to Livingston. Dawson’s mother told Kuhnlein that Stever almost certainly had not returned to Tennessee.
On August 16 the assistant prosecutor telephoned the Livingston district attorney and learned that he had received the certificate, but had not yet served Stever. The record does not indicate that the Livingston district attorney had begun looking for Stever. There is no evidence of any further communication between the prosecution and the local district attorney.
On August 22, during the afternoon session of the due diligence hearing, Officer Kuhnlein testified that after his direct testimony that morning, he telephoned Detroit Edison and learned that Stever had been receiving electrical service at bis Michigan address under the name of "Donald” Stever. There is no evidence that the prosecution relayed this information to the Livingston district attorney or followed up on it in any other way.
There is no evidence that the prosecution communicated with the repossessing bank to determine if it had any forwarding addresses or could provide other leads to persons who may have known Stever’s whereabouts. The tenant said that his previous month’s rent was collected by a person who he thought was a member of Stever’s family. There is no evidence of an effort to locate this person.
The prosecution had not obtained the names or addresses of any of Stever’s relatives other than the address of his mother. And, although it had [73]*73Stever’s mother’s address, it did not attempt to communicate with her. The prosecution had the name of Stever’s girl friend — who had reportedly left with him — but there is no evidence of any attempt to communicate with her friends and relatives.
c
The Illinois Court of Appeals in People v Payne, 30 Ill App 3d 624; 332 NE2d 745 (1975), determined that the prosecution had failed to exercise good-faith diligence in attempting to locate a missing witness. Jerome Payne was tried for robbing Oscar Fallin. A mistrial was declared because the jury was unable to agree. On retrial, Payne was convicted. Fallin testified at the first trial, but did not appear at the retrial. The transcript of his previous testimony was read to the jury.21
The prosecution made numerous attempts to locate Fallin. The chief investigator noted that he made "20 to 25 attempts” to locate him before Payne’s retrial. After detailing the prosecution’s substantial efforts, the court declared that they were insufficient. Not only had the prosecution been tardy and incomplete in its efforts to find Fallin after the first trial, it had known that Fallin had been difficult to find for the first trial and yet had taken no measures to assure his return for the retrial. "The State was aware that Fallin had been a difficult witness to locate for the first trial, but took no steps to insure his appearance later even though it knew that his testimony was essential to a conviction and that the case would be tried again.” Payne, supra, p 629. The prosecution’s failure to take adequate measures to assure that a vital witness against the defendant [74]*74would appear at a retrial barred a finding of good-faith due diligence.22
[75]*75People v Schepps, 217 Mich 406; 186 NW 508 (1922), describes the sort of thorough efforts that constitute due diligence. The issue at trial was whether Schepps was one of a group of robbers. The preliminary examination testimony of Florence Earl, although neither conclusive nor the sole evidence identifying Schepps as one of the robbers, was highly convincing. Earl was subpoenaed but did not appear at trial. The court continued Schepps’ trial a number of times (for an unknown number of weeks) while the prosecution attempted to find her. Officers searched Detroit and followed up rumors that she had moved to Canada, searching Windsor and interviewing her parents in Ontario, and her two sisters "found living elsewhere.”
This Court held that these efforts were sufficient to enable the prosecution to use Earl’s preliminary examination testimony at trial. In contrast with the instant case, the trial was continued a number [76]*76of times and the prosecution promptly followed all leads, traveling itself to a foreign jurisdiction to look for the witness.
D
Here, as in Payne, the prosecution knew that Seidel, Dawson, and Stever had been difficult to locate for the first trial, that they had left the state and had an incentive to go into hiding.
Subsequent belated and incomplete efforts did not rise to the level of good-faith due diligence. The efforts to locate each should have begun earlier. The prosecution knew on May 13 that Dye’s retrial was set for August 22, but did not attempt to locate Seidel until one month later, did not attempt to locate Dawson until two months later, and did not attempt to locate Stever until almost three months later. The initial attempts all failed, yet the prosecution did not increase its efforts.
The prosecution relied on the local Cucamonga, Mason City, and Livingston police to do the investigatory work, but was tardy in providing the local police with sufficient information and did not follow up and press the local police to act. Photographs of the witnesses were mailed less than a week before the retrial.
Certificates were sent under the uniform act, but in themselves these did not obligate the local police to undertake a diligent search. The uniform act is a mechanism for the production of witnesses; it does not oblige local police to search for a missing witness. Invocation of the uniform act’s mechanism would have become important had Dawson, Seidel, or Stever been found out of state. The act would then have enabled the local police to produce the witness for the prosecutor in Michigan. Invocation of the uniform act’s production [77]*77mechanism, however, is not a substitute in itself for a diligent effort to find the witnesses.23
The prosecution’s obligation to make a diligent good-faith effort is nondelegable. If the prosecution relies on out-of-state police to follow particular leads, and they make a diligent good-faith effort to find and produce the witness, then their efforts may discharge the prosecution’s obligation. In the instant case, however, there is no evidence that the out-of-state police made diligent good-faith efforts. The Mason City police believed Seidel was living at home with his mother, but apparently only visited the home once. The Cucamonga police believed Dawson was living and working in the [78]*78area, yet apparently made only one visit to his suspected residence and did not attempt to find where his employment lead may have led. The efforts did not constitute good-faith due diligence.
The prosecution should have begun the searches earlier, pressed local officers to engage in the searches, and perhaps, as in Schepps — in light of the inadequate efforts of the local police — sent its own investigator. The prosecution undertook none of these steps. Such "affirmative measures” may well have produced the witnesses.
hi
Dye asserts that two lines of inquiry by the prosecution in its case in chief were improper. The first was questions put to Seidel, Dawson, Stever, and Richard Troher24 whether Dye had in their presence accused anyone else of committing the killings. The second was questions put to these four witnesses whether Dye had accompanied them to make a statement to the police.
We agree with Dye that questioning Troher whether Dye had accused anyone else of the killings, and questioning all four witnesses whether Dye had made a statement to the police, was improper. It would not have been "natural,” within the meaning of People v Collier, 426 Mich 23; 393 NW2d 346 (1986), for Dye to have made such accusation in Troher’s presence or to have made a statement to the police. On remand, these questions should not be asked during the prosecution’s case in chief.
Questioning Seidel, Dawson, and Stever whether [79]*79Dye accused anyone else of the killings, however, was not improper. Their testimony that Dye failed to accuse anyone else of the killings correlated with their testimony that Dye had confessed the killings to them. This questioning may be allowed on remand.
Dye testified that he did not kill the two women. He said that Seidel killed the women, and that he had been sleeping and was awakened by the shots.25 By his own admission, however, Dye was an accessory after the fact. He participated with Seidel, Dawson, and Stever in cleaning up the clubhouse and joined Seidel in disposing of the bodies.
Prior to his arrest, Dye did not speak with the police of his involvement in the killings. Dye did not tell police that Seidel was the killer.
In People v Collier, supra, this Court adopted the evidentiary standard set forth in Commonwealth v Nickerson, 386 Mass 54; 434 NE2d 992; 35 ALR4th 722 (1982). As a general rule, the prosecution cannot impeach a defendant on the basis of his prearrest silence. "Allowing impeachment with prearrest silence suggests that a defendant has a duty to incriminate himself and burdens his right to testify on his own behalf.” Collier, supra, p 34. This is inappropriate because " 'it is a generally held notion that one does not have to say anything to the police and that what one does say may be used against him.’ ” Id.26
[80]*80In Collier, this Court held that the prosecution’s impeachment of defendant Collier’s prearrest silence was proper. Collier, according to his testimony, had acted in self-defense. He "testified that he was in fact the victim of an armed robbery rather than a perpetrator of an assault.” Id., p 34. The Court concluded that it would have been natural for Collier to contact the police:
[W]e believe it is entirely natural and expected that one who has been robbed under the circumstances related by the defendant would report the crime to the police. Defendant knew the identity of the robber and the location of the robbery. It would have been natural for him to report the crime to the police, to have the assailant arrested, and to retrieve his property. [Id., pp 34-35.]
Where it would not have been natural for the defendant to contact the police — where doing so may have resulted in the defendant incriminating himself — -the prosecution cannot properly comment on the defendant’s failure to contact the police.27
We conclude that it would not have been natural for Dye to have made a statement to the police because if he had done so such a statement would have tended to incriminate him as an accessory after the fact.
Nor would it have been natural for Dye to have [81]*81accused someone else in Troher’s presence. According to Dye, he was an accomplice after the fact; hence an accusation of Seidel would also have incriminated Dye. Further, there was no apparent incentive for Dye to have, in Troher’s presence, accused Seidel. An accusation of Seidel by Dye in Troher’s presence would not have aided Dye.
Questioning Seidel, Dawson, and Stever concerning Dye’s failure to accuse anyone else of the killings, however, was not improper. In contrast to Troher, Seidel, Dawson, and Stever testified that Dye had confessed to them that he had committed the killings. Their further testimony that Dye had not accused anyone else of the killings correlated with their testimony concerning his confession. If Dye had in fact confessed to Seidel, Dawson, and Stever that he was the killer, he would not have accused anyone else of the offenses. This questioning merely restated in a different form the properly admitted testimony concerning Dye’s confession.
Questioning the three witnesses concerning Dye’s failure to make a statement to the police,28 however, did not reciprocate their testimony that Dye had confessed. Applying the Collier analysis, it would not have been natural for Dye to have made a statement to the police for the reasons set forth above: Dye, according to his own testimony, was an accomplice after the fact, and any statement that he made would have incriminated him.
Because it would not have been "natural” for Dye to have made a statement to the police, on remand the prosecution should not in its case in [82]*82chief ask questions concerning or adverting to Dye’s failure to make a statement to the police.
E
Dye on direct examination testified that he did not make a statement to the police because his attorney advised him not to do so.29 The prosecution asserts that because Dye offered this testimony, the prosecution could have subsequently offered impeaching testimony, and therefore — even if the prosecution improperly included the testimony in its case in chief — any error was harmless. On these facts, the prosecution’s argument is circular.
[83]*83In all events, on remand Dye should be able to avoid misunderstanding concerning his intentions by an affirmative statement in limine whether he intends, absent inquiry by the prosecution in its case in chief, either to claim that his prearrest conduct tended to indicate his innocence, or to explain why he did not make a statement to the police, or to refer to his statement to the arson investigators.30
We reverse the decision of the Court of Appeals and remand for a new trial.
Cavanagh and Archer, JJ., concurred with Levin, J.