Expert Witness Blog
In the Fifth Circuit’s 2024 decision in Johnston v. Ferrellgas, Inc., No. 23-10019 (5th Cir. 2024), the role of the Safety Expert Witness was central to a high-stakes propane products liability dispute. The court’s Daubert analysis ultimately reversed a substantial jury verdict, illustrating how strict the appellate scrutiny of safety expert testimony has become.
Background and Parties
The plaintiffs were injured in a propane flash-fire incident in Texas and brought a products liability suit against Ferrellgas, Inc., a major propane distributor. Plaintiffs alleged that a 20-pound propane tank delivered by Ferrellgas had a defective face-seal at the valve interface, allowing propane to escape and ignite. The case proceeded to a jury trial in the Northern District of Texas, which returned a $1.7 million verdict in favor of the plaintiffs.
Role and Methods of the Safety Expert Witness
Plaintiffs retained Scott Buske, a propane safety expert, to opine on the alleged face-seal defect and the foreseeability of flash-fire ignition. Buske’s methodology included:
– Inspection of the subject propane tank and valve assembly.
– Review of Ferrellgas’s filling, refurbishment, and quality-control protocols.
– Application of industry safety standards governing propane container manufacture and distribution.
– Analysis of the incident scene to reconstruct the leak-and-ignition sequence.
Buske concluded that a defective face-seal was the most probable cause of the leak, and that the defect existed when the tank left Ferrellgas’s possession.
Court’s Daubert and Reliability Analysis
On appeal, the Fifth Circuit conducted a rigorous Daubert review. The panel found that Buske’s opinion linking the alleged defect to Ferrellgas’s conduct rested on assumptions rather than direct evidence. The court emphasized three deficiencies:
– Buske had not examined the tank in its as-distributed condition and could not exclude post-distribution causes of the seal failure.
– His opinion that the defect existed when the tank left Ferrellgas’s control was grounded in a process-of-elimination argument that omitted plausible alternative explanations.
– The methodology did not satisfy Texas products liability law, which requires the plaintiff to prove that the defect existed at the time the product left the seller’s hands.
The Fifth Circuit held that Buske’s testimony, as offered, did not provide a reliable evidentiary basis for the verdict.
Impact on the Outcome
The court reversed the $1.7 million judgment and rendered judgment in favor of Ferrellgas. The decision underscores that, even in cases involving catastrophic injury, a Safety Expert Witness’s opinions must be tied directly to the specific factual record and meet the reliability requirements of Federal Rule of Evidence 702. Speculative causation theories—even when based on industry experience—will not survive appellate scrutiny.
This case stands as a cautionary precedent for plaintiffs in propane and industrial-safety litigation: a Safety Expert Witness must be prepared to demonstrate, with specific evidence, that the alleged defect was present when the product left the defendant’s control. Without that link, even compelling jury verdicts can be reversed on Daubert grounds.