Mysteriously, the appellate court chose to keep its lengthy opinion unreported and of "no precedential value." (It is reproduced at the end of this posting and available as a pdf file.) Many appellate courts do not publish opinions that simply apply settled law and would be of interest only to the parties, but that is not the situation here. The trial judge's refusal to grant the defense's request for such a "Frye hearing" has received national condemnation, 1/ and the new opinion is one of a very few to take seriously widespread misgivings about bitemark evidence.
As described in an NBC report complaining that "the justice system ignores science," 2/
What was the Commonwealth's rejoinder? The Blair County district attorney is "The Honorable Richard A. Consiglio." (That is his title on the county's website, which emphasizes his success in dealth penalty cases along with his receipt of "an award ... for standing up to the Blair County Courts on behalf of the unborn." "Rich," as the website also refers to him, told now retired Blair County Judge Jolene Grubb Kopriva in 2016 thatA little after noon on June 24, 2004, a fisherman on Canoe Creek Lake in Blair County, Pennsylvania, found the bound, beaten and sexually abused body of Tina Miller near a boat launch. Suspicion focused on [Paul Aaron] Ross, who’d been with Miller nearby the night before.
There were no witnesses to the killing, leaving authorities to build a case on circumstantial evidence: a man who said he had dropped Miller and Ross off near the boat launch, former girlfriends who said he’d abused them, a mark found on one of Miller’s breasts, and items collected from the scene ─ including a shoe print and a beer bottle. None of it definitively linked Ross to the murder, and Ross denied killing Miller, asserting that another man had picked her up in a truck. But prosecutors argued that, taken collectively, the evidence proved his guilt.
He went to trial in 2005, and a bite-mark examiner helped seal his conviction.
The examiner, Dr. Dennis Asen, was a dentist with 25 years of experience identifying bodies by their teeth and examining bite marks. On the stand, he recalled viewing Miller’s body at the morgue and concluding that her breast bore patterns of a bite mark. He took a photograph of it and made an “overlay tracing” that he uploaded to a computer and compared with molds of Ross’ teeth and the teeth of four other suspects, including three who’d been in contact with Miller in the hours before her death. Asen said he found the mark “very highly consistent” only with Ross’ teeth. Asen acknowledged, however, that he couldn’t say with 100 percent certainty that Ross had made the mark. The defense hired its own bite-mark examiner, who said he was unable to determine whether Ross left the mark.
Ross was convicted of first-degree murder and sentenced to life in prison. But the conviction was overturned by an appeals court that ruled the trial court had “abused its discretion” in refusing to give Ross’ lawyer more time to prepare, and allowing the former girlfriends’ testimony.
Prosecutors plan to try Ross again, but the process has stalled amid a battle over the bite-mark evidence.
Defense lawyers, including members of the New York-based Innocence Project, have cited government reports and academic studies, including from the National Academy of Sciences, the President's Council of Advisors on Science and Technology and the Texas Forensic Science Commission.
The reports have shown that no one has sufficiently proven that human bite marks are unique, or that skin is a reliable material to record them ─ or that forensic dentists can reliably identify a human bite mark in the first place.
Acknowledging that "the use of bite-mark evidence is beginning to face challenges," Judge Kopriva ruled the evidence admissible on the basis of the lawyers' arguments. She wrote in Match 2017 that "it would be premature for this court to order that the methodology is no longer generally accepted in the relevant scientific community.” 4/the authors of scientific reports lack “real world” experience. He ... pointed out that no court in any state has ruled against admitting it. “This is evidence, your honor, that has been accepted for 40 or 50 years, not quite as old as I am, but 40 or 50 years, maybe longer, accepted by courts everywhere.” 3/
In a blog post (since deleted), "the Innocence Project described the case as an example of "'willful scientific illiteracy among the judiciary.' ... Judge Kopriva imposed a gag order preventing either side from talking publicly about the case outside of court." 5/
But she also certified an interlocutory appeal of her order denying the motion for a Frye hearing. (Ordinarily, such evidentiary rulings are only reviewed as part of an appeal from the verdict at the end of the trial.) The Superior Court refused to accept the interlocutory appeal. But then the Pennsylvania Supreme Court vacated the Superior Court's order and directed it to decide whether there had to be an evidentiary pretrial hearing on the admissibility of bitemark evidence
This week, on November 21, the Superior Court released its opinion. The court held that the trial court abused its discretion in agreeing to admit bitemark opinion testimony without first conducting a Frye hearing. The opinion, written by Judge Mary Murray, discusses Frye v. United States, 293 F. 1013 (D.C. Cir. 1923), the Superior Court's understanding of the general-acceptance requirement as it has been construed in Pennsylvania, and how this requirement applies to a request for an evidentiary hearing on bitemark evidence.
According to the Ross opinion, "Frye contemplated a judicial inquiry, informed by experts, into the general acceptance of the scientific methods used." Yet, Frye contains no mention of "a judicial inquiry" in the form of a pretrial evidentiary hearing on the status of a method among scientists. Without any such hearing to draw on, the Court of Appeals in Frye determined that "the systolic blood pressure deception test has not yet gained such standing and scientific recognition among physiological and psychological authorities as would justify the courts in admitting expert testimony deduced from the discovery, development, and experiments thus far made." 6/ The court simply announced its conclusion in an enigmatic eight-paragraph opinion. The task of devising suitable substitutes for judicial fiat fell to later generations.
Today, the use of hearings with expert testimony on scientific acceptance is well developed. In Pennsylvania, however, the touchstone for deciding when such hearings are essential often is said to be "novelty." Thus, Judge Kopriva relied on the lack of novelty in denying the defense's requested hearing, and the Superior Court focuses on the supposed requirement as well.
But Frye itself imposed no "novelty" requirement. All that Frye said in this regard that was the blood pressure test had yet to cross "the line between the experimental and demonstrable stages." 7/ The opinion did not consider whether a procedure could cross the line, but then fall back once more into the darker side of "this twilight zone." 8/ Bitemark evidence once was thought to have been valid (by its practitioners at least), but, as the defense in Ross argued, today the larger scientific community (and a growing number of dental experts) do not recognize its scientific validity.
Fortunately, the Superior Court, after flailing about in an effort to decide what needed to be novel, also addressed the more appropriate question of whether the relevant scientific community still believes (if it ever did) that the kind of testimony that Judge Kopriva was going to admit is generally accepted. It rejected District Attorney Consiglio's idea that acceptance within the forensic odontology community is sufficient, and it recognized that recent literature indicated significant dissension even within that community and outright rejection by a broader scientific community. Consequently, it held that the trial court could not admit the prosecution's evidence without a meaningful hearing on general acceptance in the broader community.
Of course, this holding does not dictate the outcome of the hearing. Indeed, the trial court could avoid an evidentiary hearing entirely, by reviewing the readily available scientific literature (with briefing by the parties) and concluding that it does not support the general acceptance of the comparative analysis that the prosecution proposes to present. After all, the proponent of the scientific evidence bears the burden of demonstrating its general acceptance, and that will not easy for the state to do in this case.
Nonetheless, that is too great an about-face to expect from the trial court. More likely, the court will proceed with the full-blown hearing. That hearing should focus on the specific testimony that the two dentists slated to testify might give. Is there sufficient "scientific recognition" 9/ that the forensic odontologists can validly determine that the bite marks on the breast of the victim's partially submerged body are human (if that is what they propose to say)? That (whether or not the marks are from a human source) they do not come from the four other potential suspects? That they were "very highly consistent" with Ross's dentition (as Dr. Asen testified at the original trial)? If the testimony were kept to a bare minimum, such as "unable to exclude as a possible source of the marks," with no explanation of the implications of such an inclusion (because scientific knowledge is too thin), 10/ would it be sufficiently helpful to be admissible? 11/ Or would it be inadmissible as being inscrutable or too easily overvalued?
The time when these issues could be avoided by arguments about "novelty" and "real world experience" has passed.
- John Shuppe, 'We Are Going Backward': How the Justice System Ignores Science in the Pursuit of Convictions, NBS News, Jan. 23, 2019, https://www.nbcnews.com/news/us-news/we-are-going-backward-how-justice-system-ignores-science-pursuit-n961256.
- Id.
- Id. There are exceptions to the District Attorney's bald assertion that "courts everywhere" deem bitemark testimony admissible. See infra note 11. Mr. Consiglio's timeline also was incorrect. The earliest use of bitemarks as identification in a U.S. criminal case may have been some 150 years ago, in 1870. See Barry E. Lipton et al., History of Odontology, in Manual of Forensic Odontology 1, 27 (David R. Senn & Richard A. Weems eds., 2013). The first reported case was a 1954 murder trial in Texas. Id. at 28. But see Michael J. Saks et al., Forensic Bitemark Identification: Weak Foundations, Exaggerated Claims, 3 J. L. & Biosci. 538 (2016), available at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5570687/ (asserting that before 1974 a some years thereafter, it was "the rule among forensic dentists that crime scene bite marks could not be trusted to yield accurate source identifications.).
- Id.
- Id.
- Frye v. United States, 293 F. 1013, 1014 ( D.C.. Cir 1923).
- Id.
- Id.
- Id.
- This seems to be the only type of inclusionary testimony the American Board of Forensic Odontology accepts from its members. See ABFO, Standards and Guidelines for Evaluating Bitemarks § 3 (2018) ("bitemark linkage conclusions should only a) exclude or b) not exclude (include) a dentition.The specific terms found in 2.c.are: a) for exclusion, Excluded as Having Made the Bitemark, and b) for inclusion, Not Excluded as Having Made the Bitemark.Stronger terms of attribution are not condoned ... .").
- Cf. Ege v. Yukins, 485 F.3d 364 (6th Cir. 2007) (the more useful testimony of exclusions and "highly consistent" matching followed by "my expert opinion" that "nobody else" among the "three and a half million people" in the Detroit area "would match up" was without foundation and violated due process). The American Board of Forensic Odontology no longer condones such testimony. See supra note 10..
Commonwealth v. Ross
No. 1738 WDA 2018 (Pa. Super. Ct. Nov. 21, 2019)
(not reported, pdf file available at
www.pacourts.us/assets/opinions/Superior/out/J-S55007-19m%20-%2010423159687925902.pdf
(not reported, pdf file available at
www.pacourts.us/assets/opinions/Superior/out/J-S55007-19m%20-%2010423159687925902.pdf
BEFORE: MURRAY, J., McLAUGHLIN, J., and COLINS, J.
MEMORANDUM BY MURRAY, J.:
Paul Aaron Ross (Appellant) appeals from the order denying his request for a Frye hearing. 1/ After careful consideration, we vacate the trial court’s order denying Appellant’s request for a Frye hearing and remand to the trial court for proceedings consistent with this decision.
This appeal arises from the June 27, 2004 murder of Tina Miller at Canoe Creek Lake in Canoe Creek State Park. Appellant was arrested and charged with Ms. Miller’s murder. On November 23, 2005, a jury found Appellant guilty of first-degree murder, aggravated assault, involuntary deviate sexual intercourse, unlawful restraint, simple assault, false imprisonment, and indecent assault. 2/
A prior panel of this Court summarized the post-trial procedural history:
At the sentencing phase of the trial, the jury rejected imposition of the death penalty. The trial court then proceeded to sentence [Appellant] to life in prison plus 24 to 48 years. [Appellant] filed post-trial motions, which the trial court denied on January 30, 2006. On February 10, 2006, [Appellant] filed a timely notice of appeal, but [Appellant’s] counsel failed to file an appellate brief and the appeal was consequently dismissed. On September 26, 2008, [Appellant] filed a PCRA petition seeking the reinstatement nunc pro tunc of his direct appeal rights, which the trial court granted on August 14, 2009.Commonwealth v. Ross, 57 A.3d 85, 90 (Pa. Super. 2012) (en banc).
On October 12, 2012, an en banc panel of this Court vacated Appellant’s judgment of sentence and remanded for a new trial. Id. at 105. On November 17, 2015, the Pennsylvania Supreme Court denied the Commonwealth’s petition for allowance of appeal.
On March 1, 2016, Appellant filed pre-trial motions in which he sought, inter alia, the exclusion of any expert evidence relating to bite mark identification and a Frye hearing. At trial, the Commonwealth intends to introduce the testimony of Dr. Dennis Asen (Dr. Asen) and Dr. Lawrence Dobrin (Dr. Dobrin). Dr. Asen and Dr. Dobrin are both dentists and practice in the field of forensic odontology (the study of the structure of teeth). Dr. Asen and Dr. Dobrin intend to testify that the mark on Ms. Miller’s left breast was caused by a human bite, and when they compared five sets of teeth molds, including one from Appellant, Dr. Asen and Dr. Dobrin could exclude four of the molds from having made the bite mark, but not Appellant’s.
On December 2, 2016, following the filing of several supplemental motions by Appellant and objections by the Commonwealth, the trial court heard oral argument on Appellant’s request for a Frye hearing. On March 8, 2017, after the parties submitted additional briefs on Appellant’s request for a Frye hearing, the trial court entered an order concluding that bite mark identification evidence is not novel and therefore a Frye hearing was not warranted. The court further provided that the Commonwealth’s experts were to adhere to the guidelines set forth by the American Board of Forensic Odontologists (ABFO).
On April 5, 2017, Appellant filed a motion to amend the March 8, 2017 order to include language relating to Pennsylvania Rule of Evidence 702(c), so that the trial court could address whether the expert methodology is generally accepted in the relevant field. Appellant also requested that the court certify for immediate appeal its decision not to hold a Frye hearing on the bite mark identification evidence.
On November 6, 2017, the trial court entered an amended order once again denying Appellant’s request for a Frye hearing. The trial court also included in the order language addressing Rule 702(c) and granting Appellant’s request for certification of immediate appeal. On December 5, 2017, Appellant filed a petition for permission to file an interlocutory appeal with this Court, which we denied by per curiam order on May 7, 2018. On June 1, 2018, Appellant filed a petition for allowance of appeal to the Pennsylvania Supreme Court. On November 20, 2018, our Supreme Court granted Appellant’s petition for allowance of appeal, vacated this Court’s order denying Appellant’s petition for permission to file an interlocutory appeal, and remanded the case to this Court for disposition.
On appeal, Appellant presents the following issues for review:
1) WHETHER THE SUBSTANTIAL EVIDENCE [APPELLANT] PROPOSED TO PRESENT AT A MOVED-FOR FRYE HEARING DISCREDITING BITE MARK ANALYSIS COMES FROM AND IS PART OF THE RELEVANT SCIENTIFIC COMMUNITY FOR FRYE PURPOSES THUS ENTITLING HIM TO A FRYE HEARING; OR WHETHER PENNSYLVANIA COURTS MUST LIMIT THEIR RELIABILITY INQUIRY TO THE VIEWS OF CURRENT PRACTICTIONERS OF THE PARTICULAR TECHNIQUE AT ISSUE?Appellant’s Brief at 5.
2) WHETHER THE SUBSTANTIAL EVIDENCE PROFFERED BY [APPELLANT] AT THE MOVED-FOR FRYE HEARING PRESENTED A LEGITIMATE DISPUTE REGARDING THE RELIABILITY OF BITE MARK ANALYSIS THUS ENTITLING HIM TO A FRYE HEARING; AND SUCH THAT THE TRIAL COURT’S ADMISSION OF THE SAME WITHOUT A FRYE HEARING WAS IN ERROR?
Both of Appellant’s issues related. Therefore, we address them together. We begin with our standard of review:
As a general rule, this Court’s standard of review of a trial court’s evidentiary ruling, including a ruling whether expert scientific evidence is admissible against a Frye challenge, is limited to determining whether the trial court abused its discretion. Grady v. Frito–Lay, Inc., 839 A.2d 1038, 1046 (Pa. 2003); Zieber v. Bogert, 773 A.2d 758, 760 n.3 (Pa. 2001) (citing Commonwealth v. Minerd, 753 A.2d 225 (Pa. 2000)). “An abuse of discretion may not be found merely because an appellate court might have reached a different conclusion, but requires a result of manifest unreasonableness, or partiality, prejudice, bias, or ill-will, or such lack of support so as to be clearly erroneous.” Grady, 839 A.2d at 1046 (citing Paden v. Baker Concrete Constr., Inc., 658 A.2d 341, 343 (Pa. 1995)).Commonwealth v. Dengler, 890 A.2d 372, 379 (Pa. 2005) (citations modified).
Appellant argues that the trial court abused its discretion in denying his request for a Frye hearing on the admissibility of the Commonwealth’s bite mark identification evidence. This Court recently articulated the legal standards implicated by a Frye analysis:
The Frye standard originally was intended to prevent the situation in which a party would seek to introduce scientific evidence that was so new that it would be impossible to “produce rebuttal experts, equally conversant with the mechanics and methods of a particular technique.” [U.S.] v. Addison, 498 F.2d 741, 744 (D.C. App. 1974). Frye contemplated a judicial inquiry, informed by experts, into the general acceptance of the scientific methods used. The standard required that “the thing from which the [expert’s] deduction is made must be sufficiently established to have gained general acceptance in the particular field in which it belongs.” Frye, supra at 1014. At issue in Frye was admissibility of the systolic blood pressure deception test, commonly known as the lie detector test. The trial court excluded the evidence, and the court affirmed that ruling on appeal, explaining:Walsh v. BASF Corp., 191 A.3d 838, 842-43 (Pa. Super. 2018), appeal granted, 203 A.3d 976 (Pa. 2019). 3/
Just when a scientific principle or discovery crosses the line between the experimental and demonstrable stages is difficult to define. Somewhere in this twilight zone the evidential force of the principle must be recognized, and while courts will go a long way in admitting expert testimony deduced from a well-recognized scientific principle or discovery, the thing from which the deduction is made must be sufficiently established to have gained general acceptance in the particular field in which it belongs.Frye, supra at 1014. Pennsylvania adopted the Frye standard in Commonwealth v. Topa, 369 A.2d 1277 (Pa. 1977), a case involving the propriety of the trial court’s admission of voice print identification evidence through an expert, Lieutenant Nash, of the Michigan State Police. Our High Court, applying Frye, reasoned that
[t]he requirement of general acceptance in the scientific community assures that those most qualified to assess the general validity of a scientific method will have the determinative voice. Additionally, the Frye test protects prosecution and defense alike by assuring that a minimal reserve of experts exists who can critically examine the validity of a scientific determination in a particular case. Since scientific proof may in some instances assume a posture of mystic infallibility in the eyes of a jury of laymen, the ability to produce rebuttal experts, equally conversant with the mechanics and methods of a particular technique, may prove to be essential.Topa, supra at 1282 (quoting Addison, supra at 744). The Topa Court went on to conclude that the testimony of one expert could not satisfy this standard, citing commentaries questioning the reliability of sound spectrographs and voiceprints and demonstrating that it was not generally accepted within the field of acoustical science.
Thus, the Frye standard originally was intended to prevent a party from introducing scientific evidence that was so new that it would be impossible to “produce rebuttal experts, equally conversant with the mechanics and methods of a particular technique.” Addison, supra at 744. Frye contemplated a judicial inquiry, informed by experts, into the general acceptance of the scientific methods used.
In the years since the adoption of the Frye standard, this Court has clarified that “Frye only applies to determine if the relevant scientific community has generally accepted the principles and methodology the scientist employs, not the conclusions the scientist reaches.” Trach v. Fellin, 817 A.2d 1102, 1112 (Pa.Super. 2003) (en banc).
The above principles have been incorporated into Pennsylvania Rule of Evidence 702, which states:
A witness who is qualified as an expert by knowledge, skill, experience, training, or education may testify in the form of an opinion or otherwise if: (a) The expert’s scientific, technical, or other specialized knowledge is beyond that possessed by the average layperson; (b) The expert’s scientific, technical, or other specialized knowledge will help the trier of fact to understand the evidence or to determine a fact in issue; (c) The expert’s methodology is generally accepted in the relevant field. Pa.R.E. 702 (emphasis added).Appellant argues that the trial court erred in determining a Frye hearing was unnecessary in this case. Appellant asserts that the court wrongly concluded that the methodology employed by the Commonwealth’s experts in conducting their bite mark identification analysis was generally accepted in the scientific community of forensic odontology. Additionally, Appellant contends that the trial court should have examined whether the expert’s methodology for bite mark identification analysis was generally accepted in the broader scientific community, as opposed to limiting its examination to the field of forensic odontology. Appellant maintains that bite mark identification analysis has applications in several different scientific communities, and several of these communities have determined that bite mark identification analysis is not reliable and has little or no evidentiary value.
In support of his argument, Appellant relies on our Supreme Court’s decision in Betz v. Pneumo Abex, LLC, 44 A.3d 27 (Pa. 2012). At issue in Betz was the admissibility of expert opinion evidence relating to the “any-exposure” theory of legal causation, i.e., “that each and every exposure to asbestos – no matter how small – contributes substantially to the development of asbestos-related diseases.” Id. at 30. As part of its analysis, the Supreme Court had to first address, as a threshold issue, whether the trial court was correct in concluding that a Frye hearing was necessary to determine the admissibility of the “any-exposure” evidence. Id. at 52-55.
In concluding that the trial court’s decision to conduct a Frye hearing was correct, the Supreme Court explained:
There is inherent tension among the various measures for admissibility of expert testimony. The threshold common law test requires merely some reasonable pretension to specialized knowledge. See, e.g., Miller v. Brass Rail Tavern, Inc., 664 A.2d 525, 528 (Pa. 1995). Our evidentiary rules, on the other hand, suggest trial courts may take a greater role in assessing whether the testimony will assist the trier of fact to understand the evidence or determine a fact in issue, see Pa.R.E. 702, and in screening evidence to avoid unfair prejudice, confusion of the issues, or misleading of the jury, see Pa.R.E. 403. For better or for worse, however, in the context of the more conventional realms of science, the Pennsylvania decisions tend to downplay the courts’ screening function. See, e.g., Commonwealth v. Nazarovitch, 436 A.2d 170, 172 (Pa. 1981) (“[C]ourts will go a long way in admitting expert testimony deduced from a well-recognized scientific principle or discovery[.]” (quoting Frye, 293 F. at 1014)). A manifestation of this trend is that challenges generally are vetted through the Frye litmus, which winnows the field of the attacks by application of the threshold requirement of novelty. See Grady, 839 A.2d at 1043-44.Id. at 52-53 (emphasis added, footnote omitted, citations modified).
Various reasons underlie the preference to limit the courts’ involvement in determining the admissibility of scientific evidence. There is the concern that liberality in allowing challenges would substantially increase the number of challenges (and cases in which lengthy pre-trial proceedings would ensue). The competency of trial judges to accept or reject scientific theories remains a legitimate subject of controversy. Additionally, a claim or defense in many cases may rise or fall based upon expert testimony and, therefore, there is some reluctance on the part of courts to deprive litigants of their day in court.
On the other hand, this Court has recognized the influential nature of expert testimony on complex subjects, and the potential that distortions have to mislead laypersons. See id. at 1045; Topa, 369 A.2d at 1281-82. It would be naïve, in this regard, to assume that the possibility for distortion is limited to the very newest realms of science. Cf. Grady, 839 A.2d at 1045 (explaining that Frye applies not only to novel science, but also where scientific methods are utilized in a novel way).
We therefore agree with Appellants that a reasonably broad meaning should be ascribed to the term “novel.” Furthermore, we conclude that a Frye hearing is warranted when a trial judge has articulable grounds to believe that an expert witness has not applied accepted scientific methodology in a conventional fashion in reaching his or her conclusions. Accord id. We believe a narrower approach would unduly constrain trial courts in the appropriate exercise of their discretion in determining the admissibility of evidence. See id. at 1046.
Additionally, in Betz, the Supreme Court rejected the notion that the defendants could not challenge the methodology of the plaintiff’s expert pathologist with the testimony of risk assessors, toxicologists, and epidemiologists. Id. at 54. The Court reasoned that the expert pathologist’s “any-exposure” opinion “was not couched in terms of a methodology or standard peculiar to the field of pathology[,]” and “was plainly grounded on risk assessment.” Id. at 54-55. Thus, the Supreme Court determined that the subjects at issue “are not within the particular expertise of a pathologist, but, rather, are interdisciplinary in character.” Id. at 55.
In this case, the trial court reached two conclusions in denying Appellant’s request for a Frye hearing. First, the trial court determined that “[b]ite mark evidence is currently generally accepted in the relevant scientific community of forensic odontologists.” Trial Court Opinion, 11/6/17, at 5. The court explained:
The American Board of Forensic Odonotologists (ABFO) has promulgated guidelines regarding the approved methodology concerning bite mark evidence. This [c]ourt notes that the aforementioned methodology rejects the notion that human dentitions are unique to the individual. Any evidence proffered by the Commonwealth to suggest that an individual can be identified by a bite mark, rather than merely excluded or not excluded as having made the mark, would be inadmissible.Id.
Second, the trial court rejected Appellant’s reliance on Betz, finding that case distinguishable:
It is true that the Pennsylvania Supreme Court allowed the Betz defendants to address the methodology of a pathologist through the testimony of risk assessors, toxicologists, and epidemiologists. However, Betz can be distinguished from the instant case. The Betz Court found that the pathologist’s opinion was not “couched in terms of a methodology or standard peculiar to the field of pathology.” [Betz, 44 A.3d at 54]. Rather, the pathologist’s opinion was “plainly grounded on risk assessment” and was “interdisciplinary in character.” Id. at 55. The Betz Court based its decision not upon the role of pathologists generally, but upon the specific methodology employed by the individual pathologist in question. Betz does not make a broad assertion that Pennsylvania law “mandates a broader definition of the relevant scientific community” where the methodology of a pathologist is at issue. Here, the Commonwealth does not seek to offer the kind of broad-scale scientific testimony that was at issue in Betz.Id. at 6.
After careful consideration, we find support for Appellant’s position that a Frye hearing was warranted in this case. First, with respect to the trial court’s conclusion that bite mark identification analysis has general acceptance in the field of forensic odontology, Appellant offered evidence indicating that there is a lack of consensus among forensic odontologists on whether bite mark identification analysis is reliable and valid. While there is no dispute that the ABFO has established standards and a methodology for conducting bite mark identification analysis, see Commonwealth’s Third Brief in Opposition to Appellant’s Request for a Frye Hearing, 2/21/17, Exhibit B, Appellant presented numerous reports to the trial court indicating that practitioners within the community of forensic odontology question whether this methodology reliably enables forensic odontologists to identify an injury as a human bite mark.
For example, Appellant presented evidence from a presentation by Dr. David Senn, DDS, Vice-President of the American Board of Forensic Odontology, to the National Academies: Committee on Identifying the Needs of the Scientific Community. See Defendant’s Post-Argument Supplement to “Defendant’s Motion in Limine: Frye Test – Bite Mark Evidence” (hereinafter Defendant’s Post-Argument Supplement), 1/17/17, Exhibit 4 (Presentation to the National Academies: Committee on Identifying the Needs of the Forensic Science Community – Forensic Odontology Bite Marks (hereinafter Senn Presentation), 4/23/07, at 31-34). While Dr. Senn opined that bite mark identification analysis was important to the investigation and adjudication of certain crimes, id. at 45, Dr. Senn identified several “major problems” with bite mark identification analyses, including: “[t]he uniqueness of the human dentition has not been scientifically established”; “[t]he ability of the dentition, if unique, to transfer a unique pattern to human skin and maintain that uniqueness has not been scientifically established”; “[a] clear statement of the type, quality, and number of class and individual characteristics or other features required to indicate that a bite mark has reached a threshold of evidentiary value has not been established”; and “Forensic Odontology certifying organizations have not created or administered bite mark analysis proficiency tests for their board certified members.” Id. at 31-34.
Likewise, Appellant presented a report by the President’s Council of Advisors on Science and Technology, which revealed the following:
Empirical research suggest that forensic odontologists do not consistently agree even on whether an injury is a human bitemark at all. A study of the American Board of Forensic Odontology (ABFO) involved showing photos of 100 patterned injuries to ABFO board-certified bitemark analysts, and asking them to answer three basic questions concerning (1) whether there was sufficient evidence to render an opinion as to whether the patterned injury is a human bitemark; (2) whether the mark is a human bitemark, suggestive of a human bitemark, or not a human bitemark; and (3) whether distinct features (arches and toothmarks) were identifiable. Among the 38 examiners who completed the study, it was reported that there was unanimous agreement on the first question in only 4 of the 100 cases and agreement of at least 90 percent in only 20 of the 100 cases. Across all three questions, there was agreement of at least 90 percent in only 8 of the 100 cases.Defendant’s Post-Argument Supplement, 1/17/17, Exhibit 5 (PRESIDENT’S COUNCIL OF ADVISORS ON SCIENCE AND TECHNOLOGY, REPORT TO THE PRESIDENT: FORENSIC SCIENCE IN CRIMINAL COURTS: ENSURING SCIENTIFIC VALIDITY OF FEATURE-COMPARISON METHODS (hereinafter PCAST Report) 84-85 (2016)) (emphasis added).
The studies proffered by Appellant challenge the trial court’s conclusion that the ABFO’s methodology for using bite marks to eliminate persons as suspects is generally accepted in the field of forensic odontology. These reports reflect that individuals within the forensic odontology community question not only whether the ABFO’s methodology can reliably aid experts in using bite marks to validly identify or exclude individuals as criminal actors, but also whether the methodology enables experts to identify a wound as a human bite mark. Therefore, Appellant provided the trial court with articulable grounds that the Commonwealth’s expert witnesses on bite mark identification analysis have not applied accepted scientific methodology in reaching their conclusions. See Betz, 44 A.3d at 53. Accordingly, we conclude that the trial court abused its discretion in denying Appellant’s request for a Frye hearing.
We are likewise persuaded by Appellant’s argument that the trial court should not have limited consideration of the general acceptance of the experts’ methodology in this case to the field of forensic odontology. As several of the reports Appellant cites reflect, bite mark identification analysis implicates numerous scientific fields. See generally Defendant’s Post-Argument Supplement, 1/17/17, Exhibit 2 (NATIONAL ACADEMY OF SCIENCES, COMMITTEE ON IDENTIFYING THE NEEDS OF THE FORENSIC SCIENCES COMMUNITY, STRENGTHENING FORENSIC SCIENCE IN THE UNITED STATES: A PATH FORWARD (2009), Exhibit 5 (PCAST Report), Exhibit 11 (Michael J. Saks, et al., Forensic bitemark identification: weak foundations, exaggerated claims, 3(3) J. LAW BIOSCI. 1 (2016)). As these studies indicate, bite mark identification analysis not only involves concepts relating to forensic science generally, but also pathology, biology, statistics, and metrology. See Defendant’s Post-Argument Supplement, 1/17/17, Exhibit 11 (Michael J. Saks, et al., Forensic bitemark identification: weak foundations, exaggerated claims, 3(3) J. LAW BIOSCI. 1 (2016)) (noting that the forensic identification process is “fundamentally probabilistic” and that it involves the interplay of different scientific disciplines including blood (pathology), skin (biology and dermatology), and measurements (metrology)). Because the act of biting a human involves not only the biter’s teeth, but also the skin, muscle, tissue, and blood with which the teeth make contact, the notion that bite mark identification analysis involves scientific disciplines beyond forensic odontology is reasonable.
Finally, we emphasize that our decision in no way represents a determination as to the general acceptance of the methodology underlying bite mark identification analysis utilized by the Commonwealth’s experts in this case. We make no judgment as to the admissibility of the bite mark identification evidence at issue. Rather, we simply conclude that Appellant provided the trial court with articulable grounds to believe that the Commonwealth’s expert witnesses on bite mark identification analysis may not have applied generally accepted scientific methodology in reaching their conclusions, and consequently, the trial court erred in concluding that a Frye hearing was not necessary. While Appellant’s evidence expresses negative opinions on bite mark identification analysis, we cite it only to support our conclusion that a Frye hearing is proper for the resolution of these discrepancies, and to afford both parties the opportunity to present evidence in support of their positions. Therefore, we vacate the order denying Appellant’s request for a Frye hearing and remand this matter to the trial court for a hearing in accordance with Frye.
Order vacated. Case remanded. Jurisdiction relinquished. Judgment Entered.
* Retired Senior Judge assigned to the Superior Court.
1. A Frye hearing, named after the decision in Frye v. United States, 293 F. 1013 (D.C. Cir. 1923), “is a hearing held for the trial court to determine whether the general scientific community has reached a general acceptance of the principles and methodology used by the expert witness.” Commonwealth v. Walker, 92 A.3d 766, 769 n.1 (Pa. 2014).
2. 18 Pa.C.S.A. §§ 2501(a), 2702(a)(1), 3123(a)(1), 2902(a)(1), 2701(a)(1), 2903(a), 3126(a)(2).
3. This case was argued before our Supreme Court on October 15, 2019, and is awaiting disposition. See Walsh v. BASF Corp., 203 A.3d 976 (Pa. 2019). The issue before our Supreme Court is whether, in conducting a Frye analysis, “trial courts are not permitted to act as ‘gatekeepers’ to ensure the relevance and reliability of scientific studies offered by experts to support their opinions by scrutinizing whether those studies actually support their opinions.” Id. at 978. While the Supreme Court may overturn our Walsh decision, their disposition will have no bearing on the outcome of this case or the general standards triggering the necessity of a Frye hearing that were thoughtfully set forth in the Walsh decision.
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