Milward v. Acuity Specialty Products Group, Inc.

United States District Court for the District of Massachusetts · Torts

TortsExpert testimonyCausationFailure to warnOSHA preemptionDaubertRule 702specific causation

Facts

Brian Milward was diagnosed with APL in 2004 after years of occupational exposure to paint and other products while working as a pipefitter and refrigerator technician. He claimed Rust-Oleum paints contained benzene and that this exposure caused his leukemia. Milward offered industrial hygienist James Stewart to estimate cumulative benzene exposure and occupational medicine physician Sheila Butler to opine that benzene caused his APL. Rust-Oleum challenged both experts, contending Milward could not prove specific causation without admissible expert testimony.

Issue

Whether Milward had admissible and reliable expert testimony sufficient to create a triable issue that benzene exposure caused his APL, including exposure attributable to Rust-Oleum products. The court also considered whether OSHA preempted the failure-to-warn claim and whether proximate cause failed as a matter of law.

Rule

Under Rule 702 and Daubert, expert testimony is admissible only if it is based on sufficient facts or data, is the product of reliable principles and methods, and reliably applies those methods to the facts of the case. In a toxic tort case, a plaintiff must present reliable scientific evidence of specific causation connecting the plaintiff's actual exposure level to the disease; a differential diagnosis is of little assistance where most cases are idiopathic, a linear no-threshold theory is not a reliable method for proving causation in an individual case, and an expert relying on epidemiological relative-risk studies must be qualified to evaluate conflicting literature with the rigor characteristic of that field.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

In a toxic-exposure suit in Ohio, Dana Ruiz claims that years of using solvent-based coatings at a warehouse in Cleveland caused her blood disorder. Her industrial hygienist uses a peer-reviewed exposure model developed by research institutions, but the defendant argues the model should be excluded because the expert assumed room size and ventilation based on coworker testimony rather than measurements taken decades earlier.

How should the court most likely rule on the admissibility of the industrial hygienist’s exposure opinion?

Explanation. The majority held that a peer-reviewed exposure model producing fairly reliable estimates may be admitted even when the opposing party attacks the assumptions used for ventilation, frequency, and similar inputs. Those criticisms concern the factual underpinnings and credibility of the estimate, which the factfinder may weigh, rather than requiring exclusion under Rule 702.