Hernandez v. Ecolab, Inc.

Background

Leslye Hernandez worked as an environmental-services technician at Pomona Valley Hospital in California. She used Ecolab’s OxyCide disinfectant during her work. Hernandez had lifelong asthma, which she generally managed with occasional inhaler use before using OxyCide. She testified that after beginning regular OxyCide use, she experienced asthma-like symptoms, difficult breathing, throat burning, and lung irritation. She also testified that she suffered an asthma attack while cleaning an intensive-care-unit room with OxyCide and later stopped working at the hospital.

Hernandez sued Ecolab, Inc. and the Doe Defendants under state law. Her claims included strict liability based on design defect, manufacturing defect, and failure to warn; negligence; breach of express and implied warranty; intentional and negligent misrepresentation; and fraudulent concealment. The court treated the defendants collectively as “Ecolab.” The case was based on diversity jurisdiction.

Motions and Parties’ Arguments

Ecolab moved to exclude the testimony of Dr. Robert Harrison under Federal Rule of Evidence 702 and the Supreme Court’s decision in Daubert v. Merrell Dow Pharmaceuticals, Inc. Ecolab also argued that Harrison’s opinions were disclosed after the applicable deadlines and that his opinions were unreliable because he did not adequately address Hernandez’s other medical conditions and habits, conduct a differential diagnosis, quantify her OxyCide exposure, or rely on sufficient medical and pharmacy records.

Hernandez opposed exclusion. She argued that Ecolab was not sufficiently harmed by the late disclosures and that Harrison’s opinions were reliable. Harrison opined that OxyCide could cause or aggravate asthma and that Hernandez’s work-aggravated asthma was likely caused by her exposure to OxyCide.

Ecolab separately moved for summary judgment, arguing that Hernandez could not establish causation. It also challenged the manufacturing-defect claim, the warranty claims, and the intentional-misrepresentation and fraudulent-concealment claims. Hernandez did not oppose summary judgment on the manufacturing-defect claim but opposed summary judgment on the other claims.

Expert-Testimony Ruling

The court found that Hernandez’s disclosures of Harrison’s general- and specific-causation opinions were untimely and that her explanations did not substantially justify the delay. But under Rule 37(c)(1), late evidence may still be used when the failure was harmless or substantially justified. The court concluded that exclusion was not warranted because Harrison’s testimony was important to causation, Ecolab was not sufficiently prejudiced, Ecolab could depose and cross-examine Harrison, and the trial had been rescheduled to allow additional preparation time.

The court also found Harrison qualified to testify. He was board-certified in occupational and internal medicine, had extensive experience with occupational chemical exposures, had treated work-related and environmentally induced illnesses, and had treated healthcare workers who developed occupational asthma after using OxyCide. The court said disagreements about the strength or weight of his opinions could be addressed through cross-examination and competing evidence.

The court further found Harrison’s methodology sufficiently reliable and relevant. He reviewed medical and scientific literature, Hernandez’s medical records, employment information, discovery materials, and her account of her symptoms and work. The court held that Rule 702 and Daubert did not require every expert opinion to be supported by reproducible testing.

The court rejected Ecolab’s arguments concerning differential diagnosis, other medical conditions, and exposure quantification. Harrison had considered information about Hernandez’s asthma, weight, acid reflux, marijuana use, work history, and symptoms. The court found that he did not have to definitively eliminate every possible alternative cause. It also held that a precise dose measurement was not required at this stage because Hernandez offered evidence of repeated exposure and Harrison relied on scientific literature and his clinical experience. The court therefore denied Ecolab’s Motion to Exclude the Testimony of Dr. Robert Harrison.

Choice of Law

Because the case was in federal court based on diversity jurisdiction, the court applied Minnesota’s choice-of-law rules. It determined that California law applied to Hernandez’s strict-liability, negligence, negligent-misrepresentation, express-warranty, and implied-warranty claims. The court found California had the most significant contacts with those claims because Hernandez lived, worked, used OxyCide, and allegedly suffered her injuries in California. The court applied Minnesota law to the intentional-misrepresentation and fraudulent-concealment claims because the parties had not shown an outcome-determinative conflict between Minnesota and California law on those claims.

Summary-Judgment Analysis

Summary judgment is a decision before trial that is proper when no genuine dispute about an important fact exists and the moving party is entitled to judgment as a matter of law. The court found a genuine dispute about causation. Harrison gave opinions, to a reasonable degree of medical certainty, that OxyCide could cause work-related or work-aggravated asthma and that OxyCide likely caused Hernandez’s work-aggravated asthma. The court held that Ecolab’s challenges to Harrison’s exposure analysis, classification of OxyCide as a respiratory sensitizer, and consideration of other causes presented issues for the jury rather than grounds for summary judgment.

The court denied summary judgment on the express-warranty claim. It found that statements in Ecolab’s Safety Data Sheet— including that personal respiratory protection was “not normally required” for diluted OxyCide and that no symptoms were known or expected from inhaling diluted OxyCide—could constitute specific affirmations or descriptions of the product. The court also found factual disputes about whether the Safety Data Sheet’s disclaimer defeated any warranty and whether Hernandez was sufficiently exposed to the relevant statements.

The court denied summary judgment on the implied-warranty claim. Under California law, merchantability concerns whether goods are fit for their ordinary purpose, including whether they are safe for users. The court found factual disputes about whether OxyCide was safe and fit for hospital disinfection and whether Ecolab’s safety information and other evidence supported Hernandez’s claim.

The court also denied summary judgment on the intentional-misrepresentation and fraudulent-concealment claims. It held that a plaintiff need not show that a misrepresentation was communicated directly by the defendant to the plaintiff if the plaintiff received and justifiably relied on it through an intermediary. The court found evidence from which a jury could determine whether Ecolab’s information about using diluted OxyCide without personal protective equipment was misleading and whether Hernandez actually and reasonably relied on that information.

Disposition

The court ordered that Ecolab’s Motion to Exclude Dr. Harrison’s testimony was DENIED. It ordered that Ecolab’s Motion for Summary Judgment was GRANTED IN PART as to Count II, the strict-liability claim based on manufacturing defect, and DENIED IN PART as to all other claims. Count II was DISMISSED WITH PREJUDICE. The remaining claims were not ended by this order.