C.W. Ex Rel. Wood v. Textron, Inc.
807 F.3d 827
7th Cir.2015Background
- Textron operated a fastener plant in Rochester, Indiana, from 1954–2006; the plant released vinyl chloride that contaminated nearby wells, including the Woods’ well.
- Water testing of the Woods’ well showed vinyl chloride levels roughly 5–9 parts per billion; the plaintiffs’ experts later estimated ingestion at about 3 ppb.
- Jason and Adele Wood sued on behalf of their adopted children, C.W. and E.W., alleging vinyl chloride exposure caused acute gastrointestinal, immunologic, and neurologic symptoms and increased future cancer risk; claims included negligence, negligence per se, negligent infliction of emotional distress, and willful/wanton misconduct.
- The plaintiffs proffered three well-qualified experts (Dahlgren, Byers, Ryer‑Powder) who relied on differential etiology, timing (temporality), regulatory exceedances, and scientific studies (many involving much higher doses or different populations) to opine on general and specific causation.
- The district court excluded all three experts under Rule 702/Daubert, finding their methodologies unreliable (analytical gaps, attenuated studies, improper reliance on regulatory exceedances, and insufficient extrapolation methods) and then granted summary judgment for Textron because plaintiffs lacked admissible expert proof of general and specific causation.
- The Seventh Circuit affirmed exclusion of the experts and the summary judgment, but rejected the district court’s categorical rule that differential etiology can never support general causation, explaining differential etiology can, in some rigorous circumstances, contribute to both general and specific causation.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Admissibility of experts under Rule 702/Daubert | Experts’ methodologies (differential etiology, timing, published studies, regulatory exceedances) are reliable and adequate despite limited child-specific literature | Experts relied on attenuated studies, failed to bridge analytical gaps, and improperly used regulatory exceedances to prove causation | Court: District court properly applied Daubert; exclusion not an abuse of discretion |
| Reliance on regulatory exceedances to prove causation | Exceeding government standards supports a reasonable inference of risk and causation | Regulatory exceedance alone does not establish causation without showing why those standards were set | Held: Reliance on regulatory exceedances insufficient to establish causation (method properly rejected) |
| Use of epidemiological/animal studies & extrapolation to children/low doses | In absence of child studies, extrapolation from animal/higher-dose human studies is appropriate; experts need not have identical-dose studies | Studies cited were too dissimilar in dose/duration/population; experts failed to use accepted extrapolation/toxicokinetic modeling to bridge gaps | Held: District court permissibly rejected attenuated studies and experts’ extrapolations as creating an impermissible analytical gap (Joiner) |
| Whether differential etiology can establish general causation | Differential etiology can, if rigorous, help prove both general and specific causation | District court argued differential etiology is only for specific causation | Held: Seventh Circuit rejects categorical bar—differential etiology may support general causation in appropriate rigorous circumstances, but here experts’ differential etiology was unreliable and exclusion upheld |
Key Cases Cited
- Daubert v. Merrell Dow Pharm., Inc., 509 U.S. 579 (gatekeeping reliability standard for expert testimony)
- Gen. Elec. Co. v. Joiner, 522 U.S. 136 (courts may exclude expert opinion where an analytical gap exists)
- Anderson v. Liberty Lobby, Inc., 477 U.S. 242 (summary judgment requires disputes over facts that affect outcome)
- Schultz v. Akzo Nobel Paints, LLC, 721 F.3d 426 (Seventh Circuit on gatekeeper focus: soundness of expert methodology)
- Cunningham v. Masterwear Corp., 569 F.3d 673 (regulatory exceedance alone does not establish causation)
- Ruggiero v. Warner-Lambert Co., 424 F.3d 249 (Second Circuit recognizing rigorous differential diagnosis can sometimes support both general and specific causation)
- Ervin v. Johnson & Johnson, 492 F.3d 901 (Seventh Circuit on reliability review and analytical gap)