Summary
The United States District Court for the Eastern District of Louisiana denied Defendants’ motion in limine to exclude the testimony of Plaintiff’s experts, Kennith Comeaux and William Caster, under Federal Rule of Evidence 702. The court found that both experts possessed relevant specialized knowledge, relied on sufficiently reliable methods and facts, and could assist the jury in understanding the operation and pressure capabilities of the subject air rifle. The court nevertheless barred either expert from offering medical-causation testimony because neither was a medical doctor.
Topics
Practice areas
Questions Presented
- Whether Kennith Comeaux was qualified under Federal Rule of Evidence 702 to testify as a gunsmith regarding the function and safety of air rifles.
- Whether William Caster was qualified under Rule 702 to testify regarding air mechanics, pressure, and the capability of the equipment used to fill the air rifle.
- Whether the experts' opinions were based on sufficient facts or data and reliable principles and methods and would assist the trier of fact.
- Whether Comeaux and Caster could offer medical-causation testimony despite not being medical doctors.
Holdings
- Comeaux may testify as a gunsmith regarding the function and safety of air rifles because his experience, inspection of the rifle, review of relevant materials, and explained methodology satisfy Rule 702.
- Caster may testify as an air-mechanics expert regarding pressure, PSI specifications, air-tank filling capabilities, and related componentry because he possesses relevant specialized knowledge and relied on sufficient facts and a sufficiently reliable methodology.
- Disagreements with the facts relied upon by the experts or their interpretation of those facts generally present issues for cross-examination and competing evidence rather than exclusion under Rule 702.
- Comeaux and Caster may not offer medical-causation testimony because neither is a medical doctor.
Key quotations
“The object of Rule 702 is to protect juries from unreliable and irrelevant expert testimony.” (Section III)
“It is “the role of the adversarial system, not the court, to highlight weak evidence.”” (Section IV.B)
“medical causation testimony is reserved for certified medical doctors.” (Section IV.C)
Factual background
Cornwell purchased an air rifle in March 2021 and used it for nearly two years. On January 11, 2023, he attempted to fill the rifle with compressed air while following instructions prepared by Defendants that stated, "You may need to cover the barrel with your finger when filling." The rifle allegedly discharged, severely injuring Cornwell's left thumb. He brought claims under the Louisiana Products Liability Act, Louisiana redhibition law, and Louisiana rescission provisions.
Procedural history
Cornwell filed products-liability, redhibition, and rescission claims arising from an air-rifle injury. Defendants Texas Machine Parts, Danny Duke, and John Wiley moved to exclude the testimony of Plaintiff's experts, Kennith Comeaux and William Caster. After briefing, the Eastern District of Louisiana denied the motion in limine, subject to its ruling that neither expert could testify about medical causation.