¶ 1. Defendant appeals from his conviction, following a jury trial, of simple assault. He contends that the trial court erred in failing to grant his motion for a new trial based upon the discovery of new evidence potentially implicating the veracity of the testimony of one of the State’s witnesses. He also argues that the prosecution and the trial court committed a variety of procedural and evidentiary errors with respect to the testimony of this witness. We affirm.
¶ 2. On May 6, 2008, defendant’s wife was involved in an automobile accident. The police responded to the accident and ultimately processed her for driving under the influence (DUI). Due to statements made by defendant’s wife during her DUI processing regarding her tumultuous relationship with defendant, the police decided to release her to complainant instead of defendant. The police called complainant, and he picked defendant’s wife up from the police station and took her to his home.
¶ 3. The next day, complainant drove defendant’s wife to her home to retrieve some clothing from her car. Complainant claimed that when defendant saw his wife, he exited the home and jumped onto her back, exclaiming, “you’re going to get yours.” Complainant then got out of his car and tried to calm defendant down, but defendant charged complainant and attacked him. Defendant’s wife called 911 and told the operator that her husband had just attacked complainant and threatened her. Later, she similarly asserted to a police officer who took her statement that defendant attacked complainant and threatened her. The State subsequently charged defendant with domestic assault for threatening his wife and simple assault for attacking complainant.
¶4. At trial, defendant testified that complainant had attacked him, and he had responded in self-defense. Contrary to her statements to the 911 operator and the police officer, defendant’s wife testified that complainant had attacked defendant and that defendant had not threatened her; further, she claimed that her statements to the 911 operator and the police officer were lies. She further testified that over the past several years she had filed fourteen false police reports alleging spousal abuse and had also lied to the police officer during her DUI processing about fearing her husband. Her testimony with respect to the simple assault charge was contradicted by that of complainant and defendant’s neighbor, both of whom testified that defendant was the aggressor.
¶ 5. The State also called an experienced domestic violence investigator to testify about his findings on the domestic assault charge. When the State began to ask the investigator questions about “the cycle of violence,” defendant objected, arguing that the investigator was testifying as an expert witness. The court allowed defendant to voir dire the investigator in front of the jury and then allowed the State to continue examining the investigator. The State then asked again about the “cycle of violence as it pertains to domestic assault charges” and also about the likelihood that an abused woman would recant her initial allegation of spousal abuse. The investigator testified that almost all women — above ninety percent — recant their initial allegations of spousal abuse, and, on cross-examination, he opined that these women are lying when they recant.
¶ 6. The jury convicted defendant on both counts, but the court granted a *584 judgment of acquittal on the domestic assault charge, finding the State’s evidence on that charge insufficient.
¶ 7. Defendant claims subsequently to have discovered that the police investigator inaccurately stated his credentials and moved, pursuant to Vermont Rule of Criminal Procedure 33, for a new trial based on this new evidence. Specifically, defendant asserted that the investigator overstated the qualifications of one of the primary instructors of a training program that he attended, and it follows, therefore, that he improperly inflated his own credentials. This instructor was not, contrary to the investigator’s testimony, a psychiatrist. She was a victim’s advocate. Additionally, according to defendant, the State did not adequately support the investigator’s assertion that the instructor was an expert on domestic violence. Defendant further argued that the investigator’s false testimony regarding his qualifications improperly bolstered the investigator’s statements that tended to impeach defendant’s wife’s credibility — prejudicing defendant with respect to his claim of self-defense on the simple assault charge. In other words, due to the investigator’s misstatement, the jury was more likely to view the investigator as a “truth detector,” effectively impeaching his wife’s testimony that defendant acted in self-defense.
¶ 8. The trial court denied the motion. It evaluated defendant’s motion under two alternative standards. First, it considered defendant’s motion under
State v. Dezaine,
¶ 9. On appeal, defendant first argues that the trial court applied the wrong standards in assessing his motion for a new trial and therefore reached the wrong result. According to defendant, two United States Supreme Court cases,
Napue v. Illinois,
¶ 10. Whether to grant a motion for a new trial is a matter of trial court discretion, and we will not reverse the trial court’s decision on such a motion unless there is a clear showing of an abuse of that discretion.
Dezaine,
¶ 11. Defendant belatedly asserts that
Napue
and
Giglio
govern the analysis regarding his motion for a new trial based on newly discovered evidence. He did not make this assertion in his motion to the trial court. Indeed, he explicitly asked the court to evaluate his motion under the test set forth in
Robillard
— a standard he now argues should not apply. Defendant has not preserved this argument, and we decline to address its merits for the first time on appeal,
State v. Sole,
¶ 12.
Napue
and
Giglio
are readily distinguishable from the ease at bar. In
Napue,
the prosecution’s principal witness denied that he had received a promise of leniency in exchange for his testimony. Knowing this testimony to be false, the prosecutor did nothing to correct it. The Supreme Court characterized the witness’ testimony, which comprised the bulk of the prosecution’s evidence against the defendant, as “extremely important.”
Napue,
¶ 13. The investigator’s testimony cannot be described as extremely important, central, or material to the State’s case against defendant on the simple assault charge. Indeed, it is more aptly described as tangential. The testimony of the complainant, which was corroborated by a disinterested witness, his neighbor, and various pretrial statements of defendant’s wife, provided more than ample support for the prosecution’s ease against defendant. Additionally, although Napue, Giglio, and the case at bar involve new evidence bearing on witness credibility, the extent to which the new evidence revealed post-trial in each ease can be construed as having an impact on the credibility of the witness in question varies considerably in degree. Here, the new evidence merely tends to indicate that the investigator inaccurately stated the qualifications of an instructor of a training program in which he participated years ago — one of several such programs that he attended over the course of his career. Such new evidence is far less damning with respect to credibility than that involved in Napue and Giglio. In those cases it was revealed, post-trial, that the government’s primary witnesses had a substantial incentive to disregard the truth and testify in accor *586 dance with the prosecution’s theory of the case to receive a more lenient sentence, as in Napue, or immunity, as in Giglio.
¶ 14. Returning to the trial court’s decision on defendant’s motion, we observe that the court correctly applied the standards set forth in Dezaine and Robillard to the facts of this case. In Dezaine, we said that, for a defendant to succeed on a motion for a new trial on the basis of newly discovered evidence, he must show that
the evidence is such as will probably change the result if a new trial is granted; that it has been discovered since the trial; that it could not have been discovered before the trial by the exercise of due diligence; that it is material to the issue; and that it is not merely cumulative or impeaching.
a new trial will be required when: (1) the court is reasonably well satisfied that the testimony given by a material witness is false; (2) without that testimony the jury probably would have reached a different conclusion; and (3) the party seeking the new trial was taken by surprise when the false testimony was given or did not know of its falsity until after the trial.
¶ 15. Defendant next advances several procedural and evidentiary arguments related to the admission of the testimony of the police investigator. Defendant takes issue with the State’s failure to notify him that it planned to call the investigator as an expert witness. He further asserts that the court erred in allowing him to offer testimony regarding the dynamics of domestic violence and the percentage of victims of domestic violence that recant their initial allegations.
¶ 16. We need not reach the merits of defendant’s arguments because any er
*587
rors with respect to this testimony were harmless beyond a reasonable doubt.
4
See, e.g.,
State v. Oscarson,
Affirmed.
Notes
In Dezaine, we addressed the trial court’s denial of the defendant’s motion for a new trial after his conviction for possessing and transporting a deer out of season. The defendant in Dezaine moved for a new trial on the grounds that he had located a witness who would testify in conclusive support of his alibi defense.
In Robillard, the defendant had moved for a new trial after learning, post-trial, that one of the State’s witnesses had fabricated his testimony.
In the alternative, he also argues that, even under Robillard, he should be granted a new trial.
Nevertheless, we admonish the State for failing to provide any notice whatsoever that it intended to treat the investigator as both a fact and an expert witness. To comport with the purpose of Rule 16, namely, to prevent the State from gaining an unfair advantage over the defense, see
State v. Streich,
Further, the trial court erred in performing its role as gatekeeper with respect to the testimony of the investigator, which opened the door for the investigator’s testimony to the effect that over ninety percent of victims of domestic violence are telling the truth when they first report an incident — testimony of a nature that we have repeatedly held is inadmissible as tantamount to an expert opinion that the victim is telling the truth. See, e.g.,
State v. Kinney,
