Defendant was convicted by a jury, on November 29, 1972, of rape, MCLA 750.520; MSA 28.788. He was sentenced to 25 to 40 years in prison. He now appeals as of right.
The defendant did not dispute the fact that a rape had been committed or that he had commit *90 ted it. In fact, defense counsel did not cross-examine the complainant. Defendant’s defense was that he was insane at the time the offense was committed. His entire defense consisted of the testimony of two psychiatrists. All the issues that the defendant raises on appeal concern the trial court’s handling of his insanity defense.
Defendant contends that it was prejudicial error for the trial judge to permit the prosecutor to present two rebuttal witnesses who were not indorsed on the information. Following the examination of the defense’s second psychiatrist, the prosecution presented two young women. Each testified that the defendant attempted to pick her up in a manner similar to that in which he later that day successfully convinced the complainant into driving him out of a shopping center. Then at knife-point he bound the complainant, and over the course of the next several hours, he raped her four times.
MCLA 767.40; MSA 28.980 requires the prosecutor to indorse, on the information, all known witnesses. It also imposes on the prosecutor a continuing duty to attempt to indorse all witnesses as they become known to him. This requirement has been tempered, however, and only requires the prosecutor to indorse res gestae witnesses.
People v Keywell,
Thus, the first question is, were these two women res gestae witnesses? There are two basic reasons for requiring that the prosecutor indorse all res gestae witnesses. One is to allow the defendant to know who is to be called so that he may investigate and prepare for cross-examination.
People v Quick,
In the present case the two women were not witnesses to any part of the crime. They merely testified about the defendant’s actions that occurred eight to nine hours before the res gestae began. Their testimony was not necessary to make out any of the elements of the crime of rape since intent is not one of the elements.
People v Phillips,
The first reason for requiring the indorsement of res gestae witnesses also implies rebuttal witnesses should be indorsed.
People v Rose,
Although the women were never formally indorsed as witnesses, the defendant received the practical benefits that he would have received if they had been formally indorsed. The decision to allow the prosecution to add witnesses to the information at any time is within the trial judge’s sound discretion. MCLA 767.40; MSA 28.980. It is also true that the admissibility of rebuttal testimony rests within the sound discretion of the trial judge.
People v McGillen #1, supra
at 268. We will not disturb the trial judge’s decision unless there is clear abuse shown.
People v Utter,
Defendant also argues that the trial court committed two errors concerning the admissibility of the testimony of the defendant’s psychiatrists that warrant reversal.
People v Woody,
Defendant also argues that it was error for the trial court to refuse to admit into evidence two 1963 doctor’s certificates stating that the defendant was mentally ill in 1963. 2 In denying the defense’s motion to introduce the two certificates the court said: "The court is of the opinion that this would be pure hearsay, that this would cut off the right of the prosecutor to cross-examine witnesses produced by the defendant.” 3 Later the court also rejected a defense effort to introduce them indirectly by striking one of the defendant’s psychiatrist’s reference to them.
Defendant’s first proposed use of these docu
*94
ments is clearly hearsay. They are out-of-court statements introduced to prove the truth of the matter stated. McCormick on Evidence (2d ed), §246, pp 584-586. One of the reasons for the hearsay rule is that it is felt that cross-examination is necessary for the trier of the fact to accurately reflect on the credibility of the witness, and in the case of experts, the basis of their opinions. In Michigan, triers of fact are free to reject the opinions of the expert witnesses.
Vial v Vial,
On appeal defendant argues that the certificates are information on which one of the defense psychiatrists based his opinion. However, the attempt to introduce the certificates was made on direct examination, and GCR 1963, 605 provides:
"Questions calling for the opinion of an expert witness need not be hypothetical in form unless the judge, in his discretion, so requires. The witness may state his opinion and reasons therefor without first specifying data on which it is based, but on cross-examination, he may be required to specify such data. The judge, in his discretion, may require that a witness, before testifying in terms of opinion or inference, be examined first concerning the data upon which the opinion or inference is founded. Testimony of expert witness in the form of opinions or inferences otherwise admissible is not objectionable because it embraces the ultimate issue or issues to be decided by the trier of the fact.” (Emphasis supplied.)
The function of delving into the facts that the expert relied on to form his opinion is to test the basis, not establish the basis, for the expert’s opinion. The defendant has no need to establish *95 the factual basis for the psychiatrist’s opinion under the court rule. However, the certificates did more than just state facts, they stated conclusions. It is merely a method by which the defense attempted to get non-cross-examinable conclusions before the jury. These statements were hearsay and were properly excluded by the trial judge.
Defendant claims that the following instruction so misstated the prosecutor’s burden of proof on the issue of sanity as to deprive the defendant of a fair trial.
"So, where there is any evidence in the case by the respondant which tends to show that at the time of the commission of the offense he was laboring under either permanent or temporary insanity, it then becomes the duty of the prosecution to prove the sanity of the respondant by at least a preponderance of the evidence, and unless they have done so the defendant must be acquitted, in otherwords by a fair preponderance of the evidence the people must prove that he is sane beyond a reasonable doubt.”
As there was no timely objection, this Court will not review defendant’s claims of an erroneous instruction, absent manifest injustice. GCR 1963, 516.2,
People v Smith,
Defendant also argues that the prosecutor’s firm! argument derogating the insanity defense deprived him of a fair trial. Trial counsel failed to object at the time. We have reviewed the statement of the prosecutor sought to be reviewed and find that the issue of its appropriateness is not . properly before us. Any error appearing in those statements clearly could have been rectified if an objection had been raised and a curative instruction requested.
People v McLendon,
Affirmed.
Notes
MCLA 768.20; MSA 28.1043 was amended by
The Wayne County Probate Court dismissed the petition to have the defendant declared mentally ill and committed in 1963, despite the two certificates by the doctors.
In
Brown v United States,
234 F2d 140 (CA 6 1956),
aff'd
