Opinion of the Court by
Justice MINTON.
I. INTRODUCTION.
Floyd Mike Jones III was convicted of one count of incest, thirteen counts of sodomy in the third degree, eight counts of rape in the third degree, and one count of bribing a witness. The victim of Jones’s alleged sexual misconduct was his teenage stepdaughter, M.G. The Court of Appeals affirmed Jones’s conviction.
We granted discretionary review to consider the propriety of the trial court’s decisions to (1) limit the testimony of Jones’s DNA expert; and (2) permit the Commonwealth to introduce pornographic images into evidence, despite the lack of a nexus between those images and the testimony of M.G. We reverse and remand on the first issue and provide direction on remand as to the second issue.
II. FACTUAL AND PROCEDURAL HISTORY.
The grand jury indicted Jones on one count of incest, thirteen counts of sodomy in the first degree, eight counts of rape in the third degree, one count of using a minor in a sexual performance, one count of possession of matter portraying a sexual performance by a minor, and one count of bribing a witness. At trial, numerous heated disputes arose between Jones’s counsel and the Commonwealth. Chief among those disputes was Jones’s counsel’s attempt to present the testimony of a DNA expert, Dr. Yuri Melekovets, and Jones’s repeated, vehement objection to the Commonwealth’s showing the jury pornographic images allegedly copied from Jones’s home computers.
A. Dr. Melekovets’s Testimony.
Jones had furnished a copy of Dr. Mele-kovets’s one-page report to the Commonwealth as pretrial discovery several months before trial. The Commonwealth reciprocated with a copy of the two-page report of its DNA expert, Benedict Arrey. Arrey’s report stated that “[t]he human DNA recovered from the male fraction of the [vjaginal swab [taken from M.G.] ... [155]*155was a mixture of at least two contributors. [M.G.] and Floyd Jones III ... could be contributors to the DNA mixture.... The expected frequency of possible contributors to the mixed profile in the male fraction is fewer than 1 in 15,000,000 (1 in 15 million) among Caucasian, Black[,] and Hispanic Americans.” In contrast, Dr. Melekovets’s report stated that he “did not find any traces of the Y-ehromosome or of the DNA profile from Exhibit 2A (bloodstain standard from Floyd Jones III) on the vaginal swabs from [M.G.].”
The trial court allowed Dr. Melekovets to testify about the contents of his report. But the trial court did not allow Dr. Mele-kovets to testify about any perceived shortcomings in the Commonwealth’s DNA expert’s report or methodology because Jones had not informed the Commonwealth during discovery that he intended for Dr. Melekovets to criticize the Commonwealth’s expert’s methodologies. In other words, the trial court essentially confined Dr. Melekovets’s testimony to the four corners of his report.
B. Introduction of the Pornographic Images Taken from Jones’s Computers.
M.G. testified that Jones frequently showed her pornographic images of young women engaged in sexual activity before his sexual encounters with her. But M.G. did not testify that the pornographic images introduced by the Commonwealth, which were copied from computers in Jones’s home, were the actual images shown her by Jones. Rather, these pornographic images were shown to the jury and introduced into evidence via the testimony of a state police computer forensics expert who had copied the hard drives from Jones’s home computers onto a compact disc. The Commonwealth brought a computer into the courtroom and used it to show numerous pornographic images to the jury. Though the trial videotape did not definitively tell us which images the jury saw, Commonwealth’s Exhibit # 8 (the compact disc containing dozens of pornographic images ostensibly taken from Jones’s home computers’ hard drives) has numerous hardcore images of nude females, some of whom appear to be multiple-amputees, engaged in various sexually explicit activities, including urination and bestiality.
Although Jones’s counsel lodged vehement objections to the admissibility of the images in question, Jones’s counsel did not specifically object to the lack of an eviden-tiary nexus between the images allegedly shown by Jones to M.G. and the images shown by the Commonwealth to the jury.1
After several days of testimony, the jury convicted Jones of one count of incest, thirteen counts of sodomy in the third degree, eight counts of rape in the third degree, and bribing a witness. The jury found Jones not guilty of possession of matter portraying a sexual performance by a minor, and the trial court granted the Commonwealth’s motion to dismiss the charge of using a minor in a sexual performance.
In accordance with the jury’s recommendation, the trial court sentenced Jones to ten years for the incest offense, one year on each of the thirteen convictions for third-degree sodomy, three years for each of the eight convictions for third-degree rape, and five years for the conviction for bribing a witness. The sodomy, rape, and bribing a witness sentences were ordered to run concurrently with the incest señ-[156]*156tence, for a total sentence of ten years’ imprisonment.
Jones appealed to the Court of Appeals, claiming two errors: (1) the trial court erred by limiting Dr. Melekovets’s testimony to the four corners of his report, and (2) the trial court erred by permitting the Commonwealth to introduce allegedly irrelevant and prejudicial pornographic images into evidence when M.G. had not testified that the images shown to her by Jones were the same images shown to the jury.
The Court of Appeals affirmed Jones’s conviction, finding that the limitation of Dr. Melekovets’s testimony was proper because Jones’s failure to disclose during discovery Dr. Melekovets’s theories regarding alleged errors made by the Commonwealth’s DNA expert ran afoul of the reciprocal discovery requirements set forth in Kentucky Rule of Criminal Procedure (RCr) 7.24. The Court of Appeals also held that Jones had not preserved his claim regarding the lack of a nexus between the pornographic images shown to the jury and M.G.’s testimony; and, in any event, any error in introducing the pornographic images was harmless in light of the totality of the evidence arrayed against Jones.
We granted discretionary review to consider the same two issues Jones raised before the Court of Appeals. We hold that the trial court erred in limiting Dr. Mele-kovets’s testimony to the four corners of his report. Thus, since this case is being remanded for further proceedings, the issue involving the pornographic images is technically moot. But since the Commonwealth will likely again attempt to introduce these pornographic images on remand, we must address that issue.
III. ANALYSIS.
A. Restricting Dr. Melekovets’s Testimony Was Erroneous.
The trial court refused to permit Dr. Melekovets to testify as to anything outside the parameters of his report, apparently because the trial court believed that RCr 7.24(3)(A)(i) required the parties to provide in discovery the theories underlying their experts’ opinions. We disagree.
The trial court’s order of reciprocal discovery2
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Opinion of the Court by
Justice MINTON.
I. INTRODUCTION.
Floyd Mike Jones III was convicted of one count of incest, thirteen counts of sodomy in the third degree, eight counts of rape in the third degree, and one count of bribing a witness. The victim of Jones’s alleged sexual misconduct was his teenage stepdaughter, M.G. The Court of Appeals affirmed Jones’s conviction.
We granted discretionary review to consider the propriety of the trial court’s decisions to (1) limit the testimony of Jones’s DNA expert; and (2) permit the Commonwealth to introduce pornographic images into evidence, despite the lack of a nexus between those images and the testimony of M.G. We reverse and remand on the first issue and provide direction on remand as to the second issue.
II. FACTUAL AND PROCEDURAL HISTORY.
The grand jury indicted Jones on one count of incest, thirteen counts of sodomy in the first degree, eight counts of rape in the third degree, one count of using a minor in a sexual performance, one count of possession of matter portraying a sexual performance by a minor, and one count of bribing a witness. At trial, numerous heated disputes arose between Jones’s counsel and the Commonwealth. Chief among those disputes was Jones’s counsel’s attempt to present the testimony of a DNA expert, Dr. Yuri Melekovets, and Jones’s repeated, vehement objection to the Commonwealth’s showing the jury pornographic images allegedly copied from Jones’s home computers.
A. Dr. Melekovets’s Testimony.
Jones had furnished a copy of Dr. Mele-kovets’s one-page report to the Commonwealth as pretrial discovery several months before trial. The Commonwealth reciprocated with a copy of the two-page report of its DNA expert, Benedict Arrey. Arrey’s report stated that “[t]he human DNA recovered from the male fraction of the [vjaginal swab [taken from M.G.] ... [155]*155was a mixture of at least two contributors. [M.G.] and Floyd Jones III ... could be contributors to the DNA mixture.... The expected frequency of possible contributors to the mixed profile in the male fraction is fewer than 1 in 15,000,000 (1 in 15 million) among Caucasian, Black[,] and Hispanic Americans.” In contrast, Dr. Melekovets’s report stated that he “did not find any traces of the Y-ehromosome or of the DNA profile from Exhibit 2A (bloodstain standard from Floyd Jones III) on the vaginal swabs from [M.G.].”
The trial court allowed Dr. Melekovets to testify about the contents of his report. But the trial court did not allow Dr. Mele-kovets to testify about any perceived shortcomings in the Commonwealth’s DNA expert’s report or methodology because Jones had not informed the Commonwealth during discovery that he intended for Dr. Melekovets to criticize the Commonwealth’s expert’s methodologies. In other words, the trial court essentially confined Dr. Melekovets’s testimony to the four corners of his report.
B. Introduction of the Pornographic Images Taken from Jones’s Computers.
M.G. testified that Jones frequently showed her pornographic images of young women engaged in sexual activity before his sexual encounters with her. But M.G. did not testify that the pornographic images introduced by the Commonwealth, which were copied from computers in Jones’s home, were the actual images shown her by Jones. Rather, these pornographic images were shown to the jury and introduced into evidence via the testimony of a state police computer forensics expert who had copied the hard drives from Jones’s home computers onto a compact disc. The Commonwealth brought a computer into the courtroom and used it to show numerous pornographic images to the jury. Though the trial videotape did not definitively tell us which images the jury saw, Commonwealth’s Exhibit # 8 (the compact disc containing dozens of pornographic images ostensibly taken from Jones’s home computers’ hard drives) has numerous hardcore images of nude females, some of whom appear to be multiple-amputees, engaged in various sexually explicit activities, including urination and bestiality.
Although Jones’s counsel lodged vehement objections to the admissibility of the images in question, Jones’s counsel did not specifically object to the lack of an eviden-tiary nexus between the images allegedly shown by Jones to M.G. and the images shown by the Commonwealth to the jury.1
After several days of testimony, the jury convicted Jones of one count of incest, thirteen counts of sodomy in the third degree, eight counts of rape in the third degree, and bribing a witness. The jury found Jones not guilty of possession of matter portraying a sexual performance by a minor, and the trial court granted the Commonwealth’s motion to dismiss the charge of using a minor in a sexual performance.
In accordance with the jury’s recommendation, the trial court sentenced Jones to ten years for the incest offense, one year on each of the thirteen convictions for third-degree sodomy, three years for each of the eight convictions for third-degree rape, and five years for the conviction for bribing a witness. The sodomy, rape, and bribing a witness sentences were ordered to run concurrently with the incest señ-[156]*156tence, for a total sentence of ten years’ imprisonment.
Jones appealed to the Court of Appeals, claiming two errors: (1) the trial court erred by limiting Dr. Melekovets’s testimony to the four corners of his report, and (2) the trial court erred by permitting the Commonwealth to introduce allegedly irrelevant and prejudicial pornographic images into evidence when M.G. had not testified that the images shown to her by Jones were the same images shown to the jury.
The Court of Appeals affirmed Jones’s conviction, finding that the limitation of Dr. Melekovets’s testimony was proper because Jones’s failure to disclose during discovery Dr. Melekovets’s theories regarding alleged errors made by the Commonwealth’s DNA expert ran afoul of the reciprocal discovery requirements set forth in Kentucky Rule of Criminal Procedure (RCr) 7.24. The Court of Appeals also held that Jones had not preserved his claim regarding the lack of a nexus between the pornographic images shown to the jury and M.G.’s testimony; and, in any event, any error in introducing the pornographic images was harmless in light of the totality of the evidence arrayed against Jones.
We granted discretionary review to consider the same two issues Jones raised before the Court of Appeals. We hold that the trial court erred in limiting Dr. Mele-kovets’s testimony to the four corners of his report. Thus, since this case is being remanded for further proceedings, the issue involving the pornographic images is technically moot. But since the Commonwealth will likely again attempt to introduce these pornographic images on remand, we must address that issue.
III. ANALYSIS.
A. Restricting Dr. Melekovets’s Testimony Was Erroneous.
The trial court refused to permit Dr. Melekovets to testify as to anything outside the parameters of his report, apparently because the trial court believed that RCr 7.24(3)(A)(i) required the parties to provide in discovery the theories underlying their experts’ opinions. We disagree.
The trial court’s order of reciprocal discovery2 essentially tracked the requirements of RCr 7.24(3)(A)(i), which requires a defendant to “permit the Commonwealth to inspect, copy, or photograph any results or reports of physical or mental examinations and of scientific tests or experiments made in connection with the particular case.... ” We recently expressly rejected the notion that RCr 7.24 encompasses anything not explicitly covered by the rule by holding that RCr 7.24(3)(A)(i) “applies only to results or reports of scientific tests or experiments.”3 Of course, we do not countenance any attempt to skirt what we hold to be the limited parameters of RCr 7.24; and the courts of the Commonwealth must not allow either the Commonwealth or defense counsel to play a “cat and mouse game”4 with the rules governing discovery.5
[157]*157So the conclusion of the Court of Appeals that the trial court properly limited Dr. Melekovets’s testimony (because Jones committed a discovery violation when he did not provide the Commonwealth with the entire underlying bases for Dr. Melekovets’s testimony) is premised upon an impermissibly broad interpretation of RCr 7.24. Therefore, since Jones provided the Commonwealth all that was required in discovery concerning Dr. Mele-kovets’s report, the trial court erred when it relied upon RCr 7.24 to limit Dr. Mele-kovets’s testimony.
Moreover, we reject the Commonwealth’s argument that the trial court merely exercised its discretion to sanction a discovery violation when it limited Dr. Melekovets’s testimony. We certainly do not approve of any party engaging in improper dilatory tactics during the discovery process. And we agree with the Commonwealth’s unassailable contention that a trial court generally has broad discretion under RCr 7.24(9) to impose an appropriate sanction for a discovery violation. But we do not agree with the Commonwealth that the trial court’s limitation of Dr. Mele-kovets’s testimony was merely an example of a trial court exercising its discretion to sanction a discovery violation. Simply put, no party may be sanctioned for committing a nonexistent discovery violation.
Having determined that nothing in the language of RCr 7.24 itself supports the trial court’s decision to bar Dr. Meleko-vets’s contested testimony, we also reject the Commonwealth’s contention that our prior precedent compels us to find that the limitations imposed by the trial court were proper. Specifically, we hold that Barnett v. Commonwealth,6 which the Court of Appeals relied upon, does not support the trial court’s decision to limit Dr. Meleko-vets’s testimony.
Barnett was a case involving a murder for which there were no eyewitnesses. The Commonwealth contended that Barnett killed his wife late at night on an isolated road. In an effort to prove Barnett’s guilt, the Commonwealth offered the testimony of an expert serologist who testified that traces of blood found on Barnett were consistent with Barnett having washed blood off his hands in a nearby puddle after stabbing his wife. The serol-ogist’s report did not contain his opinion regarding Barnett’s purported hand washing. On appeal, we held that it was error [158]*158for the trial court to permit the serologist to testify at trial about the hand washing because the serologist’s report did not contain any opinions regarding hand washing.7
The Court of Appeals held in the instant case that the discovery violation in Barnett is similar to the one in the case now before us. We disagree.
In Barnett, defense counsel had no way to anticipate that the serologist would opine at trial that Barnett may have washed his hands in a nearby puddle after stabbing his wife because nothing in the serologist’s report hinted at such a conclusion. Thus, as we have previously attempted to explain, Barnett stands for the principle that an expert may not testify to an additional, undisclosed principle or premise not readily deducible from the conclusions contained in that expert’s report.8 In other words, Barnett was based upon our desire to prevent a party from being deliberately surprised at trial. The situation in the case at hand is different.
Dr. Melekovets’s report indicated that he found no Y-chromosomes on the vaginal swab taken from M.G. Implicitly underlying that conclusion is the obvious fact that Dr. Melekovets fundamentally disagreed with the Commonwealth’s DNA expert’s conclusion that the male DNA found in the vaginal swab taken from M.G. matched Jones. After all, a lack of Y-chromosomes necessarily rules out a match for Jones’s— or any other male’s — DNA on the vaginal swab. In other words, it surely could not have come as a surprise to the Commonwealth that Dr. Melekovets would disagree [159]*159with the conclusion and/or analytical process used by the Commonwealth’s DNA expert in light of the conclusions contained in Dr. Melekovets’s report. So we fail to perceive how permitting Dr. Melekovets to explain why he found fault with the Commonwealth’s DNA expert’s conclusion and/or methodology would have been impermissible “sandbagging.”9
However, we must note that we reject Jones’s contention that the Commonwealth’s burden in a reciprocal discovery case is somehow greater than that borne by the defendant. We perceive nothing in the language of RCr 7.24 or Barnett, or its progeny, to support Jones’s seeming contention that a defendant is entitled to the benefits of reciprocal discovery while simultaneously avoiding its concomitant burdens. And we frown equally upon any discovery violations, including sandbagging, by any party.
Having determined that it was error for the trial court to limit Dr. Melekovets’s testimony due to a nonexistent discovery violation, we now must address the Commonwealth’s contention that any error in this regard was harmless.
Under RCr 9.24, “[n]o error in either the admission or the exclusion of evidence and no error or defect in any ruling or order, or in anything done or omitted by the court or by any of the parties, is ground for granting a new trial or for setting aside a verdict or for vacating, modifying or otherwise disturbing a judgment or order unless it appears to the court that the denial of such relief would be inconsistent with substantial justice.” Indeed, since an accused has a constitutional right to present witnesses and evidence in his own defense,10 we must determine whether the error in limiting Dr. Melekovets’s testimony was harmless beyond a reasonable doubt.11
[160]*160The Commonwealth’s DNA expert’s report opines that Jones and M.G. were “contributors to the DNA mixture” contained on the vaginal swab taken from M.G. Furthermore, that report states that “[t]he expected frequency of possible contributors to the mixed profile in the male fraction is fewer than 1 in 15,000,000 (1 in 15 million) among Caucasian, Black[,] and Hispanic Americans.” So it was crucial for Jones to present testimony to counteract, or at least cast doubt upon, the Commonwealth’s DNA expert’s report. But Jones was unable to attempt fully to cast doubt upon the potentially devastating effect of the Commonwealth’s DNA expert’s conclusions and report because of the trial court’s limitation on Dr. Melekovets’s testimony. Because Jones’s right to present a defense to the charges against him was substantially curtailed by the trial court’s limitation upon Dr. Melekovets’s testimony, we cannot find that error to be harmless beyond a reasonable doubt.
For the foregoing reasons, we hold that Jones’s convictions for incest, rape, and sodomy must be reversed. But Jones’s conviction for bribing a witness is affirmed because the improper limitation on Dr. Melekovets’s testimony had no discernible bearing upon that conviction.
B. On Remand, the Pornographic Images May Not Be Introduced and Shown to the Jury Unless a Nexus is Shown Between the Images and M.G.’s Testimony.
Because Jones’s convictions for incest, rape, and sodomy are being reversed due to the trial court’s improper limitation on Dr. Melekovets’s testimony, the issue regarding the pornographic images shown to the jury is technically moot. But because the Commonwealth will likely want to present that evidence at any retrial, we must address the issue.12
M.G. did not testify that the images in question which were shown to the jury were the same images shown to her by Jones. We have previously condemned the similar introduction of such unrelated, sexually-oriented testimony in Dyer v. Commonwealth.13
In Dyer, the defendant was charged with sodomizing a boy less than twelve years of age. The victim testified that the defendant had shown him pictures depicting nudity, but the victim did not specifically identify any of the pictures depicting nudity introduced by the Commonwealth as having been shown him by the defendant. On appeal, we held that:
It is obvious the real purpose, the sole purpose, of this evidence was, in general, to prove the appellant was a sexual pervert, and, in particular, to prove that his perversion was pedophilia, and to do so on the basis of reading material found in his possession some of which would offend a substantial number of jurors, prejudicing them against the appellant without regard to whether it proved anything against him. The various pornographic pictures and articles and the nondescript photographs and memorabilia were devoid of meaning except that provided by the investigating police officer’s testimony and the prosecutor’s ar[161]*161gument labeling the material seized proof that the appellant was a pedophile. We declare, unqualifiedly, that citizens and residents of Kentucky are not subject to criminal conviction based upon the contents of their bookcase unless and until there is evidence linking it to the crime charged. If the boy’s testimony was intended to be the connecting link, evidence would be limited to that which the boy could identify as having been shown to him.14
Despite the clear warning of Dyer, the Commonwealth made no effort in the case at hand to link these sexually explicit images to any sexual contact Jones allegedly had with M.G. So the introduction of the contents of Jones’s electronic bookcase— the contents of his home computers — was highly improper. Thus, on remand, the Commonwealth should only be allowed to introduce evidence that has a demonstratively direct bearing upon the charges against Jones.15
Finally, we note that the trial court specifically stated that it purposely never viewed the sexually explicit images before they were exhibited to the jury. In its role as a gatekeeper of evidence, a trial court must view and consider any disputed evidence to determine its admissibility on relevancy grounds, regardless of the revolting nature of that evidence. Stated another way: how could the trial court properly weigh the prejudicial effect of these images against their putative, probative value without first seeing them? On remand, the trial court must not abdicate its gatekeeping role by ruling in a vacuum as to the admissibility of unseen images or objects.
IV. CONCLUSION.
For the foregoing reasons, Floyd Mike Jones Ill’s convictions for incest, rape in the third degree, and sodomy in the third degree are reversed and remanded for proceedings consistent with this opinion. Jones’s conviction for bribing a witness is affirmed. Jones has not asked us to remand this matter to the trial court for resentencing on the bribing a witness conviction, and we decline to do so on our own motion.
All sitting. ABRAMSON, CUNNINGHAM, NOBLE, SCHRODER, and SCOTT, JJ., concur. LAMBERT, C.J., concurs in part and dissents in part by separate opinion.