Defendant was convicted by a jury of carrying a concealed weapon in violation of MCL 750.227; MSA 28.424, and was sentenced to one year in the Detroit House of Corrections. The Court of Appeals reversed defendant’s conviction *574and remanded the case to the trial court.1 This Court granted the prosecutor’s application for leave to appeal.2
The Court of Appeals summarized the facts as follows:
At about 9:20 p.m. on December 7, 1982, two police officers approached defendant and two other men, Michael Johnson and Woodrow Taylor, who were standing close together on a sidewalk. The officers testified that they saw defendant drop a gun when they were about five feet from defendant. Defendant testified that Michael Johnson dropped the disputed gun when Johnson saw the officers approaching.
The prosecution endorsed Johnson as a witness. During jury voir dire the trial court told the jury panel Johnson was a possible witness. After the prosecution presented its first witness, the trial court became concerned about Johnson’s potential testimony. In a discussion on the record but without the jury present, the trial court asked counsel what Johnson might say on the stand. The assistant prosecutor said he had no idea. Defense counsel said he didn’t know whether Johnson would admit the gun was his or whether Johnson might invoke the Fifth Amendment privilege to remain silent. The trial court appointed an attorney present in the courtroom to represent Johnson. Following a brief recess, Johnson’s appointed counsel stated that, should Johnson be called as a witness, Johnson would invoke his Fifth Amendment right by refusing to answer questions regarding the ccw because answers to those questions might tend to incriminate him. Johnson also told the trial court that he would invoke the Fifth Amendment privilege if he was called as a witness. After receiving this information, the trial court held that neither the prosecutor nor the defendant could call Johnson as a witness, relying upon People v Giacalone, *575399 Mich 642, 645; 250 NW2d 492 (1977). Defendant objected, stating that the trial court was applying the Giacalone rule in an overbroad manner. [140 Mich App 344-345.]
The Court of Appeals agreed with defendant that the trial court erred by excluding Johnson as a witness. The Court of Appeals found that this Court’s holding in Giacalone was limited to the prosecution despite the broad language of the opinion prohibiting either party from calling a witness who intends to invoke the Fifth Amendment privilege to remain silent.
[W]e limit the Giacalone automatic exclusion rule to only those situations in which a prosecutor intends to call a witness knowing that the witness will invoke a testimonial privilege and, by doing so, will raise an inference prejudicial to the defendant. [140 Mich App 347.]
The Court of Appeals distinguished Giacalone from the present case, finding that the assertion of the testimonial privilege by res gestae witness Johnson in the presence of the jury might have proven favorable to defendant.
Had Johnson testified that he would not answer questions regarding the transaction at issue in this case on grounds that those answers might tend to incriminate him, the jury might have inferred that Johnson was covering up because he, not defendant, was the wrongdoer. [140 Mich App 346-347.]
The Court of Appeals found Johnson’s testimony relevant to defendant’s defense that Johnson, not defendant, dropped the gun. MRE 401. While recognizing that Johnson’s testimony would be prejudicial to the prosecution because it was not "substantial evidence” and allowed no cross-examina*576tion, the Court of Appeals found the testimony more probative than prejudicial and therefore admissible. MRE 402, 403.
The prosecutor argues that the Court of Appeals has erred in failing to apply the exclusionary rule of Giacalone to both the defense and the prosecution. We agree. Although the facts of Giacalone can be distinguished from the facts of the present case, the rule of law remains the same; a lawyer may not knowingly offer inadmissible evidence or call a witness knowing that he will claim a valid privilege not to testify.
In Giacalone, the defendant appealed his conviction, arguing that the prosecutor acted improperly in calling a codefendant to testify knowing that the codefendant would claim the privilege against self-incrimination and, in so doing, would raise an inference adverse to defendant in the minds of the jury. Giacalone’s defense counsel had objected to the calling of this witness. Giacalone, supra, pp 643-644, 647. In reversing Giacalone’s conviction, this Court cited the American Bar Association standards relating to unprofessional prosecutorial and defense conduct.
A lawyer may not knowingly offer inadmissible evidence or call a witness knowing that he will claim a valid privilege not to testify. The American Bar Association standards relating to the prosecution and defense functions provide that it is unprofessional conduct for a prosecutor or a lawyer representing a defendant
—"knowingly and for the purpose of bringing inadmissible matter to the attention of the judge or jury to offer inadmissible evidence”;4
—"to call a witness who he knows will claim a valid privilege not to testify, for the purpose of *577impressing upon the jury the fact of the claim of privilege.”5
4 ABA Project on Standards for Criminal Justice, Standards Relating to the Prosecution Function and the Defense Function (Approved Draft, 1971), § 5.6(b) (the prosecution function) and § 7.5(b) (the defense function).
5 Id., § 5.7(c) (the prosecution function) and § 7.6(c) (the defense function).
[Giacalone, supra, p 645.]
While the holding in Giacalone is based on evidentiary trial error, this Court recognized that a number of decisions finding error in these circumstances were based on a denial of defendant’s Sixth Amendment right of confrontation, as a defendant cannot effectively cross-examine a witness who invokes his testimonial privilege.3 This Court declined to reach the constitutional issue in Giacalone.
In the present case, Johnson was a res gestae witness.4 Defense counsel had no objection to John*578son testifying. Johnson was not an accomplice or a codefendant. No charges had been brought against him.5 If Johnson had testified that the gun was his or Woodrow Taylor’s and if the jury had believed his testimony, defendant would have been acquitted of the charge against him. Defendant contends that calling Johnson to the stand in order to invoke his Fifth Amendment rights in the presence of the jury was necessary to corroborate defendant’s alibi by raising an inference beneficial to his defense.
Johnson had a right under both the federal and state constitutions to exercise his privilege against self-incrimination. This privilege is held by the witness. However, the witness is not the sole judge of whether the testimony is or may be incriminating. The constitutional privilege against self-incrimination must not be asserted by a witness too soon, that is, where there is no reasonable basis for a witness to fear incrimination from questions which are merely preliminary. In re Schnitzer, 295 *579Mich 736, 740; 295 NW 478 (1940). However, a trial court may compel a witness to answer a question only where the court can foresee, as a matter of law, that such testimony could not incriminate the witness. 5 Callaghan’s Michigan Pleading & Practice (2d ed), § 37.143, p 464.
Defendant claims that Johnson should have been called to the stand and compelled to answer questions which were not incriminating. We find that the trial court properly appointed counsel for Johnson and held an evidentiary hearing outside of the jury’s presence in order to establish Johnson’s intention to "plead the Fifth” on the record. We agree with the trial court and Johnson’s counsel that answering any questions concerning the evening of defendant’s arrest, even as to Johnson’s presence at the scene of the crime, might have tended to incriminate Johnson.
Placing Johnson on the stand to invoke his Fifth Amendment privilege may have allowed the jury to infer that Johnson, not defendant, was guilty of the present charge. However, as the Court of Appeals noted, this procedure would produce no "substantial evidence.” A witness who exercises his Fifth Amendment right is not confessing or admitting guilt. Therefore no inferences may be. drawn from his refusal to testify.
There is disagreement whether a claim of the self-incrimination privilege logically supports an inference of guilt. While the law draws no such inference, "the layman’s natural first suggestion would probably be that the resort to privilege in each instance is a clear confession of crime.” 8 Wigmore, Evidence (McNaughton rev), §2272, p 426. [399 Mich 646, n 6.]
In People v Thomas, 51 NY2d 466; 434 NYS2d 941; 415 NE2d 931 (1980), the New York Court of *580Appeals held that defense counsel had no absolute right to call an alibi witness who counsel knew would refuse to testify on the basis that his testimony might be self-incriminating. In Thomas, as in the present case, defense counsel wanted the witness to invoke his testimonial privilege in front of the jury.
[A] witness’ refusal to testify on constitutional grounds does not, in and of itself, have any real probative significance, although it may have a disproportionate impact upon the minds of the jurors and may tend to create the impression that the witness is guilty of a particular crime ....
[A] particular witness’ decision to refrain from testifying can never mean more than that the witness himself believes that something he might say would tend to implicate him with respect to some criminal wrongdoing of which only he is aware. It would thus be wholly improper in most situations to give the jurors an opportunity to speculate as to the nature of this wrongdoing by allowing a party to parade a witness before the jury for the sole purpose of eliciting in open court the witness’ refusal to testify. [People v Thomas, 51 NY2d 472-473.][6]
The purpose in applying Giacalone to the defense as well as the prosecution was most ably *581articulated in People v Diaz, 98 Mich App 675, 684; 296 NW2d 337 (1980).7
As a matter of public policy, we believe the exercise of a witness’s constitutional right to remain silent should not be used as evidence to support an inference for either side. Such an inference is wholly speculative since it rests on litigants’ perception of juries’ foibles. A jury may infer the refusal to testify is a confession implicating defendant or may somehow believe defendant was not involved since his accomplice would not testify. Neither inference is desirable because the former is obviously prejudicial to defendants while the latter inference cannot be combated by the truth testing device of cross-examination due to the constitutional rights of the witness. Nor can the evidence be termed "relevant evidence.” Relevant evidence means evidence having any tendency to make the existence of any fact that is of consequence to the determination of the action more probable or less probable than it would be without the evidence. MRE 401. The wholly specu*582lative inference advanced by defendant does not make the existence of any fact of consequence more probable or less probable. The witness was properly excluded. MRE 403.
In Giacalone, Justice Levin, writing for the Court, questioned the efficacy of instructions given after a witness has invoked his testimonial privilege on the stand. Justice Levin cited Judge Learned Hand’s reference to Wigmore’s description of such instructions as "mental gymnastics” in United States v Maloney, 262 F2d 535, 538 (CA 2, 1959). Maloney, like Giacalone, involved the calling of a codefendant to the stand by the prosecution and the attempt to cure such error with a cautionary instruction.
We believe that the present case differs from Giacalone in this respect: Where a party does not produce or call a codefendant or known witness to substantiate a claim of innocence or guilt, the jury may draw an adverse inference from the absence of this evidence. A neutralizing instruction explains to the jurors that they may draw no inference from the absence of certain witnesses nor engage in speculation about the possible nature of their testimony.
In the present case, the trial court gave the following cautionary instruction to the jury:
There has also been reference made to two individuals who may or may not have been out on the street at that time, and their names were mentioned to you. Do not speculate one way or the other as to what, if anything, these individuals might have testified to, because that should not be held against either the prosecution or the defense that you have not heard from those witnesses. Do not speculate as to what they might have testified to.
*583It is unclear from the lower court record whether defense counsel requested such an instruction or the court gave it sua sponte. Both the prosecutor and defense counsel stated that they were satisfied with the instructions given by the court. We feel that a neutralizing instruction, while not mandatory, should be given when properly requested by either party in order to avoid unfair prejudice and to aid in trial strategy.
We reverse the decision of the Court of Appeals and reinstate defendant’s conviction.8
Williams, C.J., and Levin, Brickley, Boyle, and Riley, JJ., concurred with Cavanagh, J.140 Mich App 343; 364 NW2d 330 (1985).
422 Mich 937 (1985).
State v Nelson, 72 Wash 2d 269; 432 P2d 857 (1967); Commonwealth v Terenda, 451 Pa 116; 301 A2d 625 (1973); and Robbins v Small, 371 F2d 793 (CA 1, 1967), cert den 386 US 1033; 87 S a 1483; 18 L Ed 2d 594 (1967). See also Douglas v Alabama, 380 US 415; 85 S Ct 1074; 13 L Ed 2d 934 (1965). [Giacalone, supra, pp 645-646, n 6.]
A res gestae witness is one who is present at the scene of the alleged crime, at the time of the alleged crime, or one who had occasion to observe the surrounding events and circumstances. This includes those who were eyewitnesses to some event in the continuum of the criminal act and whose testimony will aid in the full disclosure of facts surrounding the alleged commission of the crime. People v LeFlore, 96 Mich App 557; 293 NW2d 628 (1980).
It is the prosecutor’s duty to endorse all such witnesses and to produce them at trial. MCL 767.40; MSA 28.980. There were three res gestae witnesses endorsed in the present case: Woodrow Taylor, Michael Johnson, and Deborah Morrison, who had called the police on the night in question. A notation in the lower court file indicates that the trial court found that the prosecutor had exercised due diligence in attempting to locate these witnesses. Such a finding is required by People v Robinson, 390 Mich 629; 213 NW2d 106 (1973), to excuse the prosecutor from his duty to produce these witnesses at trial. Apparently Johnson’s appearance at Dyer’s trial surprised the prosecutor.
The prosecutor made the following comment to the trial court in Johnson’s presence:
Mr. Walsh: Somebody’s going to bum for the gun, Your Honor. If the jury believes Mr. Johnson, then Mr. Johnson is going to stand trial on this gun case. And if the jury disbelieves him, as is our theory, then Mr. Dyer is going to get the prize.
At the time this comment was made, the court had already appointed counsel for Johnson. Johnson’s counsel had spoken with him and informed the court that he had advised Johnson not to answer any questions about the incident involved in the present trial. Had the prosecutor made such a comment prior to the court’s action, it may have constituted intimidation of a witness requiring reversal. People v Pena, 383 Mich 402; 175 NW2d 767 (1970).
The proper procedure is for the prosecutor to inform the court, out of the presence of the witness, of the possible need for the witness to be informed of Fifth Amendment rights. If the trial judge finds such a warning necessary, the court should inform the witness of his right not to incriminate himself. This should be done out of the presence of the jury. People v Callington, 123 Mich App 301, 307; 333 NW2d 260 (1983). See also United States v Smith, 156 US App DC 66; 478 F2d 976 (1973).
See United States v Johnson, 488 F2d 1206 (CA 1, 1973); State v Polsky, 82 NM 393; 482 P2d 257 (1971); State v Igoe, 206 NW2d 291 (ND, 1973); Commonwealth v Greene, 445 Pa 228; 285 A2d 865 (1971); State v McBride, 226 NW2d 175 (SD, 1975); Bradley v United States, 136 US App DC 339; 420 F2d 181 (1969); United States v Atnip, 374 F2d 720 (CA 7, 1967).
Not only was the defense prohibited from calling any witnesses who would take the Fifth on the stand, but it was found improper for either party to comment on the failure of the other party to produce such a witness. United States v Johnson; United States v Atnip; State v McBride. A majority of these cases permits or requires a neutralizing instruction to be given to the jury when properly requested by either party. (See discussion below.)
In contrast, while ostensibly affirming the exclusionary rule in Giacalone, the Court of Appeals failed to apply it to the defense in People v Jerry Johnson (After Remand), 86 Mich App 430; 272 NW2d 672 (1978), and People v Bashans, 80 Mich App 702; 265 NW2d 170 (1978).
In Johnson, the Court found that a res gestae witness who plans to invoke his testimonial privilege should be called to the stand in order to allow defense counsel the opportunity to impeach his testimony. In Bashans, the Court held that a codefendant who agrees to take the stand to invoke his testimonial privilege after advice of counsel and warnings from the judge may be called.
The Court concluded in both cases, as in the present case, that any inferences drawn from the witness’ refusal to answer on the basis of self-incrimination would benefit defendants. As we stated earlier, the invocation of the testimonial privilege has no probative value. Neither the court nor the jurors should speculate as to the possible meaning of this act by a witness. Nor would impeachment by either party be possible as there is no substantive evidence to impeach.
The Court of Appeals should have applied Giacalone to the defense counsel as well as the prosecution in both cases. Either party could have requested a neutralizing instruction to prevent a prejudicial inference being drawn by the jury from the failure of the defense to produce an alibi witness.
We agree with the Court of Appeals disposition of defendant’s other issues. We note in particular the prosecutor’s improper comments during closing argument and hope that no further caution or reprimand will be necessary to deter such behavior in the future.