Defendant Osman Malik Sesay (the “Defendant”) is charged in a seven-count Third Superseding Indictment. Counts Three and Four alleged that, on April 29, 2021, the Defendant possessed a Glock 26, 9mm semiautomatic pistol (“Exhibit 008”) and approximately 18 rounds of 9mm ammunition in furtherance of a drug trafficking crime. Counts Six and Seven alleged that, on July 16, 2021, the Defendant possessed several other firearms.
The Government will have to prove that Glock firearm identified as “Exhibit 001,” installed with the conversion device identified as “Exhibit 001A,” constitutes a “machinegun.”
During discovery, the Defendant disclosed the rebuttal report of his firearms expert Brian Luettke.
Luettke will opine, inter alia, that Exhibit 001A “was crudely made[,] . . . is not dimensionally correct in size to function as a machinegun conversion device[,]” and, specifically, “does not fit correctly into the rear part of [Exhibit 001’s] slide.”
Government filed a motion to exclude Luettke’s testimony as “based on an erroneous understanding” of the statutory definition of “machinegun” and “not based on any reliable methodology.”
Firearms & Ballistics Expert Witness
Brian Luettke has 22 years of experience as an Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) special agent, provided instruction to ATF agents on firearms, and served in multiple supervisory positions before retiring in 2020.
As such, the Court found that Luettke’s opinion that Exhibit 001A does not function as a machinegun conversion device is directly relevant to the offense charged in Count Six of the Third Superseding Indictment.
Luettke determined that Exhibit 001A “is not dimensionally correct in size to function as a machinegun conversion device[,]” which tends to make it less probable that, when Exhibit 001 was possessed by Defendant, it satisfied the statutory definition of a “machinegun.” Specifically, if Luettke’s opinion is accepted, it would tend to make it less probable that Exhibit 001, with Exhibit 001A installed, “[was] designed to shoot, or [could] be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger.”
Analysis
The Court held that Luettke’s conclusions would assist the jury in deciding whether Exhibit 001, with Exhibit 001A installed, satisfies this portion of the statutory definition of “machinegun.”
Luettke also test fired the separate Glock firearm identified as “Exhibit 008,” installed with a conversion device identified as “Exhibit 008A.”
The Government argued that “the statutory definition does not require that the device fire reliably.” However, Luettke’s conclusions are not based solely on the inconsistent or unreliable automatic firing of Exhibit 001. They are also based Luettke’s own observations and measurements of Exhibits 001A and 008A.
Therefore, Luettke’s opinion may assist the jury in determining, from the totality of the evidence, whether Exhibit 001, with Exhibit 001A installed, was “designed to shoot” or could be “readily restored to shoot” in the manner of a “machinegun” when the Defendant allegedly possessed them.
The Government argued that Luettke failed to explain how his measurements supported his conclusion. The Court disagreed. Exhibit 001A was cracked and bowed when installed in Exhibit 001 at the time SA Eisenbise received the firearm, and she had to alter Exhibit 001A in order for the device to permit automatic firing of Exhibit 001.
Held
The Court denied the Government’s motion to exclude the testimony of Brian Luettke.
Key Takeaway:
Luettke’s observations of both Glock firearms and both conversion devices demonstrated a technical connection between the size of a machinegun conversion device and its effectiveness as a machinegun conversion device for a given firearm.
In sum, the Court found Luettke’s opinions to be relevant and based on reliable methods.
Antoinette Tillman, Individually and as Adminstratrix of the Estate of George Homer Tillman III, brought this action on behalf of George Homer Tillman III against Defendants alleging excessive deadly force, as well as corresponding claims under New York state law, all stemming from a fatal police shooting that occurred on April 17, 2016. The Defendants opened fire on Tillman, killing him.
In his expert report, Plaintiff’s expert David Balash criticized several conclusions reached by Kristen Landi, the medical examiner who conducted the autopsy of the decedent, George Tillman. In particular, he disagrees with Landi regarding the source and trajectories of various bullets that struck Tillman.
Defendants have moved to preclude Balash’s expert testimony. On September 23, 2024, Defendants’ motion was granted in part—specifically, Balash was precluded from testifying as to the results of a test live firing exercise he witnessed, from which he attempted to ascertain the position of the firing officers by marking the locations where spent shell casings hit the ground. The Court reserved decision on the core of Balash’s report—his opinions regarding the trajectories of the various bullets that struck Tillman—pending a Daubert hearing.
At the Daubert hearing, Balash testified as to the bases for those opinions. He also opined, for the first time, that officers failed to properly maintain the scene of the shooting surrounding Tillman’s body during their investigation. He described his conclusions as being based on videos disclosed by the Defendants to Plaintiff after discovery had closed, though he explained that those videos likely would not have affected his core conclusions.
Following the hearing, the parties submitted letters supplementing their motion in limine briefing.
Firearms & Ballistics Expert Witness
David Balash has extensive practical experience examining shooting victims. He has worked in the field of forensic ballistics for over fifty years, first at various positions within the Michigan Department of State Police, then as an independent forensic consultant. Over this time, he has “examined hundreds of shooting victims at crime scenes, autopsies, hospitals and funeral homes” and has “used and interpreted X-rays at crime scenes, autopsies, and hospitals.”
Balash objected to Landi’s conclusion that bullet “A” entered Tillman’s skull, “struck the inner table of the skull with associated fractures of the right middle fossa of the base of the skull and changed direction upward and to the left to the right parietal and frontal lobes.” He opined that “bullets do not change directions to travel back along the same or virtually the same path without something extremely forceful causing that movement.” He concluded that, accepting Landi’s autopsy findings as true, “the only force capable of that change of direction would be a solid hard mass preventing the bullet in question from exiting the skull in the first place” and that “Tillman’s head had to have been against the pavement to explain this bullet’s flight path.”
At the Daubert hearing, Balash clarified that he was not opining that Tillman’s head was, in reality, laying against the pavement when bullet “A” was fired—only that that was the only explanation consistent with Landi’s autopsy notes, which he considers flawed.
Qualifications
The Court held that Balash’s years of experience examining shooting victims and X-rays qualifies him as an expert to dispute Landi’s conclusions regarding the trajectories of the bullets fired at Tillman. Defendants did not explain why Balash’s practical experience is insufficient to qualify as specialized knowledge regarding gunshot trajectories. Nor did they explain why a medical degree is required to qualify as an expert in this field.
Reliability
Balash’s testimony at the Daubert hearing has satisfied the Court that he reached his conclusions about how bullets behave within the body via reliable evidence and methods. Balash testified that he based his opinion—that “[b]ullets do not change directions to travel back along the same or virtually the same path” naturally within the body—on his accumulated experience examining hundreds of autopsies of shooting victims involving bullets of various calibers.
Moreover, Balash’s testimony established that his inferences about bullet trajectories from the shape of the entry wounds, debris found on the decedent’s body around the entry wounds, and condition of the recovered bullets were reliably founded on his extensive history investigating shooting victims and crime scenes.
Relevance
With respect to Balash’s opinions articulated in his expert report on the propriety of the post-shooting investigation and evidence collection conducted by the NYPD and Landi, as the Court indicated at the September 23 conference, Balash may testify as to the specific criticisms he expressed in his report and at the Daubert hearing regarding how Landi’s autopsy procedure was conducted, so long as those criticisms inform his other opinions about why Landi’s conclusions regarding the sources and trajectories of the fired bullets are incorrect or suspect. The Court made it very clear that criticisms of the NYPD and Landi that do not bear on these conclusions, in contrast, are not relevant.
Late Disclosure
Finally, Balash’s opinions regarding how officers should have maintained the scene of the shooting for purposes of evidence preservation are precluded by the Court. If the observations in the videos affected Balash’s opinions, he could have supplemented his expert report anytime in the year since the plaintiff received them. The Court held that permitting him to testify as to a brand-new opinion not contained in his report on the eve of trial would run afoul of Federal Rule of Civil Procedure 26(a)(2)(B).
Held
The Court denied Defendants’ motion in limine to preclude Balash’s expert opinions about Landi’s conclusions regarding the trajectories of bullets fired at Tillman. However, the Court precluded Balash from offering opinions about the maintenance of the scene of the shooting that were not contained in his expert report.
Key Takeaway:
Balash was allowed to form his expert opinions via inferences from his extensive practical experience, and his failure to cite scientific studies regarding bullets’ behavior within the body did not render his opinion inadmissible. Balash based his opinion on his accumulated experience examining hundreds of autopsies of shooting victims involving bullets of various calibers.
Plaintiff Michael Colwell alleged that a Sig Sauer P320, which he was issued in connection with his duties as a police officer in Troy, New York, discharged during a police training exercise even though Plaintiff never touched the trigger. Plaintiff testified that he put the gun in his holster during the exercise and was starting to move across his body to get his taser, or was “just about to get there,” when the gun discharged.
As a result, Colwell brought this diversity action against Defendant Sig Sauer, the manufacturer of a Sig Sauer P320 handgun which Plaintiff alleges discharged unintentionally, into Plaintiff’s thigh. Colwell asserted claims for strict products liability, negligence, breach of implied warranty of merchantability, breach of express warranty, and negligent and intentional infliction of emotional distress. His wife, Julia Colwell, asserted a claim for loss of consortium.
Defendants’ motions challenged the expert testimony of William Vigilante and James Tertin. The experts have opined that the lack of external safeties rendered the P320 defective because it is a single-action pistol with a short trigger pull, which makes it more likely to be actuated. Both experts have opined that the defective design was a cause of the unintentional discharge in this case.
General Background Regarding the P320
Tertin opined that the P320 had no external safeties. External safeties “help prevent unintended discharges by manually blocking the trigger from being pulled until the user decides they are ready to fire.” Competitors sell striker-fired handguns with external safeties, such as (1) thumb safeties and (2) tabbed trigger safeties.
Plaintiffs asserted that the failure to include a manual thumb safety and/or a tabbed trigger into the design of the P320 rendered the firearm defective and unreasonably dangerous.
Firearms & Ballistics Expert Witness
James Tertin is currently the director of research and development for Magnum Research, a firearms manufacturer based in Pillager, Minnesota. In that role, he is responsible for designing and developing new firearms for the company.
He has been a professional gunsmith since graduating in 1972 from the Gunsmithing School at Trinidad State College in Colorado; the oldest gunsmithing school in the United States. Over the past fifty years, he has been awarded seven firearm design patents.
William Vigilante graduated with a Doctoral of Philosophy and a Master’s of Science in Ergonomics (Human Factors) Psychology and a Bachelor of Science degree in Psychology (Cognitive track). He is also a Certified Professional Ergonomist by the Board of Certification in Professional Ergonomics. He has more than 25 years of experience in psychological and human factors research with a focus on human-machine interaction, control-display design, product design, hazard identification and mitigation, risk perception, situational awareness, perception-reaction time, and the design and testing of warning systems.
Plaintiffs sought to present Vigilante’s testimony “that the P320’s lack of safety features was a proximate cause of Plaintiff’s unintended discharge.” Vigilante testified that “had Sig Sauer integrated a tab trigger safety into the design of the Sig P320, the subject unintentional discharge would most likely not have occurred and Michael Colwell would not have been injured.”
The Court held that Vigilante’s knowledge of this particular incident is severely limited. He did not personally inspect the holster or the pistol. He read Plaintiff’s testimony but did not speak with Plaintiff or anyone with direct knowledge about the incident.
The Court found that Vigilante’s causation opinion did not pass muster under Rule 702 because it is not “based on sufficient facts or data”; it is not “the product of reliable principles and methods” and it does not “reflect a reliable application of the principles and methods to the facts of the case.”
Plaintiffs have cited cases in which Vigilante’s proffered testimony had established a connection between the alleged design defect and the facts of the particular case. In one case, there was video footage of the incident, leading to an undisputed theory of how the pistol discharged. Here, however, there was no video footage, no explanation as to why Colwell’s pistol discharged, and no experimentation.
James Tertin
In forming his opinions, Tertin relied upon his inspection of the P320 pistol used by Plaintiff, his inspection of an exemplar P320, his review of several competitor pistols, and videos of other similar incidents.
During his deposition Tertin testified that he did not review any file materials in this matter and understood the incident to have occurred as Plaintiff described it. Tertin did not inspect the Plaintiff’s holster and did not have an opinion as to whether Plaintiff’s hands were fully off the pistol at the time it discharged or what conclusions the police reached regarding the incident.
Tertin acknowledged that he had no information about whether Plaintiff would have engaged a manual thumb safety in this instance if one had been available. To that end, there is nothing in the record to demonstrate that a manual safety would have been engaged if the P320 had one. According to the Court, without any evidence permitting an inference that a thumb safety would have been used, a finding that the lack of a thumb safety caused the accident is pure speculation.
Tertin’s analysis hinges on “practical function” that because a pistol with a tabbed trigger has “one more step for safety,” Plaintiff’s pistol would have been less likely to fire if it had a tabbed trigger. Nevertheless, Tertin acknowledged that guns with tabbed triggers can discharge unintentionally too. It is worth noting that Tertin did not explain how a tabbed trigger would have prevented the accident if a foreign object, such as an article of clothing, had been caught in the trigger.
Held
The Court granted Defendant’s motions in limine challenging the opinions of William Vigilante and James Tertin.
Key Takeaways:
Vigilante’s causation opinion was excluded because of his severely limited knowledge of the incident.
Tertin’s conclusion that the lack of a thumb safety caused the accident is not supported by evidence permitting an inference that a thumb safety would have been used.
A district judge in Alabama excluded the testimony of the firearms & ballistics expert because he did not offer any evidence to show any of the alleged dangerous conditions in order to support the product liability claims.
Plaintiff James Andrew Scott, II filed a complaint against Remington Arms Company, LLC (“Remington”) alleging that defects in the trigger mechanism for a Remington Model 770 bolt-action rifle caused it to fire unexpectedly, resulting in the death of his daughter, Alyssa Brooke Scott.
On November 13, 2017, 15-year-old Alyssa and her godmother Christal Davis went deer hunting together. After Alyssa and Davis decided to end the hunt, Davis closed the rifle’s bolt and tied a nylon rope through the trigger guard to lower the rifle to Alyssa. Davis testified that she tied the rope behind the trigger and made sure there was no slack in the knot. Alyssa told Davis that she turned on the rifle’s manual safety switch before she handed over the gun, but Davis does not remember personally checking the position of the safety before she began to lower the rifle from the deer stand.
Davis lowered the rifle with the muzzle pointing down and the rope fastened through the trigger guard. About halfway down, the gun fired and the bullet struck and killed Alyssa.
Before the Court is Remington’s combined motion to exclude the opinions of Plaintiff’s proffered liability expert, Jerry Morris and motion for summary judgment.
Firearms & Ballistics Expert Witness
Jerry Morris has been a gunsmith for 51 years and has worked on hundreds of makes and models of firearms, serviced over 10,000 firearms,” and taught classes on gunsmithing. His expert report represented that he “had extensive knowledge and experience with the Remington 770 rifle, and the trigger system in particular.”
Remington argued that Morris’ affidavit is a violation of Rule 26 since it was untimely under the existing scheduling order and consisted of new reasoning and opinions.
The Court held that Scott “was not allowed to use [the Morris affidavit] to supply evidence on a motion, at a hearing, or at a trial, unless the failure was substantially justified or is harmless.”
But Scott did not argue that the failure to timely disclose this evidence was substantially justified or harmless, despite being given the opportunity to do so. Instead, Scott stuck to his argument that the evidence was an expansion or elaboration of Morris’ previous testimony, which the Court rejected.
The Court held that the affidavit did not qualify as a supplementation under Rule 26(e) because it went well beyond correcting or completing inaccuracies or omissions in the original expert report.
Rule 702
Remington challenged all of Morris’ opinions. First, Remington contended that he was not qualified to offer his defect opinion and that this opinion was not based on any reliable method-based testing, literature, observations, or experience. Second, Remington argued that Morris’ causation opinion was not supported by any testing, the evidence in this case, or his personal experience.
1. Qualification
Morris based his opinion on the manufacturing process of the Model 770’s trigger and sear. He claimed that Remington uses “inferior powdered metal in the components of the trigger system” and that the rough sear contact was unpredictable and inconsistent.
The Court held that Morris may know a lot about guns, but there is no evidence that he ever investigated or studied the materials in the Model 770 trigger mechanism. He has not designed any fire controls or fire control components and has not reviewed any manufacturing or design records related to the Model 770 rifle. In fact, he admitted that he has only repaired two 770 rifles and cleaned about a dozen in his long history as a gunsmith. And as to this particular gun, he did not measure the sear engagement or contact points between the trigger and sear since he did not have the proper tools. In other words, Morris was not qualified to offer an opinion on the metallurgical properties or design process of the trigger or sear in the Remington Model 770 rifle.
2. Reliability
The Court held that even if Morris had the qualifications to offer his opinions, they would fail the reliability prong of the Daubert inquiry.
To begin with, Morris did not provide any measurements or objective observations of rough contact points or surfaces between the sear and trigger in the rifle at issue here. In fact, he admitted that he did not have the tools to measure them. Likewise, when Morris offered the opinion that the low and inconsistent trigger pull forces he documented resulted from a chipped trigger or rough contact points between the trigger and sear, his testimony merely assumed the presence of a chipped trigger or rough contact points without any evidence supporting that assumption.
The Court found that Morris did not perform any testing or offer any evidence to show that any of the alleged dangerous conditions—“powdered metal” trigger components, rough sear contact points, a chipped trigger, or inconsistent trigger pull weights—caused the rifle to fire without activating the trigger.
3. Assisting the Trier of Fact
The Court found that Morris’ theory that the gun could have bumped the tree as it was lowered to the ground lacked evidence; instead, the uncontroverted evidence from the single surviving eyewitness is that the gun did not bump the tree.
The Court concluded that multiple portions of Morris’ opinions were not based on facts in evidence, and thus would not assist the trier of fact.
With the exclusion of Morris’ expert opinions, Remington contended that Scott did not offer sufficient evidence to support his product liability claims. The Court agreed and entered final judgment in favor of Remington and against Scott.
Held
The Court granted Defendant’s motion to exclude the opinions of Plaintiff’s proffered liability expert, Jerry Morris.
Key Takeaway:
Morris based his defect and causation opinions on the materials and process Remington used to manufacture the trigger and sear. The Court excluded his opinions because he did not produce any literature, reports, or other documentation to support his contention that the Model 770’s components are inferior to other fire controls using different processes or materials. Importantly, he did not provide any testing, explanation, or other support for his theory that using hardened forged steel would create a more consistent contact point between the sear and the trigger. Instead, there is simply no explanation in the record for the methodology he used in reaching his conclusions. Morris has not designed any fire controls or fire control components and has not reviewed any manufacturing or design records related to the Model 770 rifle.
In January 2021, Timothy Davis experienced an unexpected discharge of his Sig Sauer P320 XCarry pistol while exiting his vehicle, resulting in a severe leg injury from a 9mm hollow-point bullet. The circumstances surrounding the incident were unclear, with conflicting accounts in Davis’ deposition. He stated that, while sitting in his vehicle, he holstered the P320, and as he extended his leg, the pistol discharged. Davis insisted that the P320 was fully holstered and secured on his left hip.
However, a police report and an EMT report provided a different version, indicating that Davis was attempting to holster the P320 when the discharge occurred. Regardless, Davis claimed the P320 discharged without a trigger pull, a contention disputed by Sig Sauer.
In January 2021, Plaintiff Timothy Davis claimed that his Sig Sauer P320 XCarry pistol discharged unexpectedly, injuring his leg with a 9mm hollow-point bullet. Davis provided conflicting accounts of the incident: one stating he holstered the gun before exiting the vehicle, and another suggesting he was attempting to holster it when the discharge occurred.
Davis filed a product liability and negligence lawsuit against Sig Sauer, alleging that the P320 lacked external safeties, making it unreasonably dangerous. Gunsmith James Tertin and human factors engineer William Vigilante, serving as expert witnesses, argued that the absence of a manual safety rendered the pistol defective, increasing the risk of accidental discharge. They contended that this defect was the proximate cause of Davis’ injury.
Sig Sauer moved to exclude Tertin and Vigilante’s opinions and sought summary judgment, claiming that without the expert testimony, there was no genuine dispute of material fact, and Davis failed to establish causation.
Firearms & Ballistics Expert Witness
James Tertin is currently the director of research and development for Magnum Research, a firearms manufacturer based in Pillager, Minnesota. In that role, he is responsible for designing and developing new firearms for the company.
He has been a professional gunsmith since graduating in 1972 from the Gunsmithing School at Trinidad State College in Colorado; the oldest gunsmithing school in the United States. Over the past fifty years, he has been awarded seven firearm design patents.
Human Factors Engineering Expert Witness
William Vigilante graduated with a Doctoral of Philosophy and a Master’s of Science in Ergonomics (Human Factors) Psychology and a Bachelor of Science degree in Psychology (Cognitive track). He is also a Certified Professional Ergonomist by the Board of Certification in Professional Ergonomics (#2019). He has more than 25 years of experience in psychological and human factors research with a focus on human-machine interaction, control-display design, product design, hazard identification and mitigation, risk perception, situational awareness, perception-reaction time, and the design and testing of warning systems.
Discussion by the Court
Federal Rule of Evidence 702 governs the admissibility of expert witness testimony. It permits an expert to testify about scientific knowledge if “(a) the expert’s scientific, technical, or other specialized knowledge will help the trier of fact to understand the evidence or determine a fact in issue; (b) the testimony is based on sufficient facts or data; (c) the testimony is the product of reliable principles and methods; and (d) the expert has reliably applied the principles and methods to the facts of the case.”
Sig Sauer had challenged the testimony of Tertin and Vigilante on various grounds, asserting that their causation opinions were speculative and lacked reliable foundations. Additionally, Sig Sauer questioned Vigilante’s qualifications to opine on firearm design. Sig Sauer’s primary objective was to exclude Tertin and Vigilante from expressing the view that Davis’ accident might have been prevented with a thumb safety or tabbed trigger safety on the P320.
The Court concurred with Sig Sauer’s argument, finding that neither Tertin nor Vigilante had a reliable factual basis for their causation opinions. Tertin’s opinion, which stated that any single-action firearm without a manual thumb safety is defective, lacked empirical evidence. Tertin suggested that a tabbed trigger “probably would have prevented the accident,” but he admitted to having no information about what caused Davis’ trigger to depress. Tertin performed no analysis on the circumstances of the accident, providing no basis for his conclusion on the lack of a manual safety being the proximate cause. The Court deemed Tertin’s opinion as pure speculation, lacking any factual foundation or empirical evidence, and therefore inadmissible for proving causation.
Vigilante’s opinion faced a similar challenge. He contended that the P320’s lack of an external manual safety made it defective and unreasonably dangerous, attributing it to the unintentional discharge in Davis’ case. According to Vigilante, triggers could move through inertia, foreign object contact, or contact with a body part, but he lacked an opinion on how Davis’ trigger became engaged.
Vigilante admitted to not inspecting Davis’ pistol or holster, relying solely on Davis’ deposition and a sheriff’s report for his understanding of the accident. He did not speak with Davis or review the first responders’ testimony, and no testing or analysis of physical evidence was conducted to validate Davis’ version of the accident. Vigilante’s causation opinion appeared detached from the specific circumstances of Davis’ case, relying on a general conclusion about the P320’s safety without factual support.
Even Vigilante’s generalized conclusions were based on shaky grounds, using anecdotal data from YouTube videos and a memorandum by the United States Immigration and Customs Enforcement Agency. This lack of empirical evidence failed to meet the standards set by Rule 702 for expert testimony. Even if one assumed the absence of a manual safety was a design defect, Vigilante provided no factual basis for concluding that a manual safety would have prevented Davis’ specific accident. Without a thorough investigation into the accident’s circumstances, Vigilante’s causation opinion was deemed too speculative and lacking reliability. Therefore, his expert testimony was precluded.
The Court briefly addressed another argument asserted by Davis in support of admitting the expert testimony of Tertin and Vigilante. Davis compared two recent Orders from other district courts that considered similar motions filed by Sig Sauer. In the Northern District of Georgia, Sig Sauer’s motions were partially denied, while in the Western District of Oklahoma, Sig Sauer’s motions were granted. Davis urged the Court to distinguish the Western District of Oklahoma case, Herman V. Sig Sauer, asserting that the facts in the present case were distinct.
After reviewing both Orders and their supporting records, the Court concluded that Herman was not distinguishable, particularly concerning the reasoning supporting the exclusion of expert testimony by Tertin and Vigilante. Despite the Northern District of Georgia recognizing that the opinions of Tertin and Vigilante were based on the specifics of the incident in that case, the Court found no similar evidence in the present case. Similar to the Herman Court, the Court noted broad conclusions about an alleged defect in Sig Sauer’s P320 applied generally to the case’s facts. Tertin and Vigilante both admitted that the specific circumstances of Davis’ incident weren’t crucial to their opinions. Therefore, as explained above, neither expert could be relied upon to provide an accurate and helpful opinion on what may have caused the injury in Davis’ particular case. Consequently, both experts were precluded from testifying.
With the exclusion of Tertin and Vigilante, Davis found himself without any expert witness to testify regarding the alleged defect and causation. This absence meant that Davis could not demonstrate the existence of a defect and its role in causing his injury. Consequently, his claims lacked an essential element and failed under Kentucky law. As a result, the Court granted Sig Sauer’s motion for summary judgment.
Held
The Case was decided in Defendant, Sig Sauer’s favor after the testimony of both experts, James Tertin and William Vigilante were excluded and Sig Sauer’s motion for summary judgment was granted.
Key Takeaways:
The admissibility of expert witness testimony is governed by Federal Rule of Evidence 702, which sets criteria requiring the expert’s knowledge to assist the trier of fact, be based on sufficient facts and data, use reliable principles and methods, and be reliably applied to the case’s facts. In the case against Sig Sauer, challenges were raised against the expert testimony of Tertin and Vigilante, asserting that their causation opinions were speculative and lacked reliable foundations. Additionally, Vigilante’s qualifications to opine on firearm design were questioned. The Court, agreeing with Sig Sauer’s arguments, found that neither expert had a reliable factual basis for their causation opinions, rendering them inadmissible under Rule 702 due to a lack of empirical evidence and factual support. Both experts were criticized for offering broad conclusions about an alleged defect in Sig Sauer’s P320, which were then applied generally to the case’s facts, leading the Court to deem their opinions speculative and lacking a specific connection to the incident in question. Vigilante’s reliance on anecdotal data and Tertin’s admission of no empirical evidence were cited as failures to meet the standards set by Rule 702, which requires a reliable basis for expert opinions. Attempts by the Plaintiff to distinguish the present case from others with varying outcomes were rejected by the Court, emphasizing the lack of similar evidence showing the experts’ opinions were based on the specific circumstances of the incident. With the exclusion of expert testimony, the Plaintiff was unable to demonstrate the existence of a defect and causation, resulting in the failure of claims under Kentucky law. As a consequence, the Court granted Sig Sauer’s motion for summary judgment, underscoring the critical role that expert testimony can play in product liability cases.
Case Details:
Case Caption
Davis v. Sig Sauer, Inc.
Docket Number
3:22cv10
Court
United States District Court for the Eastern District of Kentucky, Central Division
