Arias v. Dyncorp
928 F. Supp. 2d 1
D.D.C.2013Background
- Plaintiffs, ~2,000 Ecuadorian residents, sues DynCorp for damage from Plan Colombia herbicide drift in Ecuador.
- Plaintiffs assert general and specific tort claims including injury to persons, crops, livestock, and fish.
- Defendants move for summary judgment, arguing lack of expert proof on exposure dose/duration and causation.
- Plaintiffs rely on eyewitness accounts and Dr. Wolfson asserting exposure caused symptoms and cancer risk without dose specifics.
- Court grants summary judgment for crops, livestock, and fish but denies it for Plaintiffs’ personal injuries; chronic injury causation remains contested.
- Matter involves admissibility and sufficiency of expert versus lay testimony for causation in toxic torts.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| General causation for personal injuries without expert proof | Arias argues experts unnecessary due to eyewitness signs and Wolfson’s testimony | Defs. say expert science exceeds lay understanding | General causation for personal injuries survives; crops/livestock/fish dismissed |
| Acute injuries—causation through lay testimony | Temporal proximity suffices to show causation | Need expert dose/duration evidence | Yes, lay testimony with temporal linkage creates triable issue for acute injuries |
| Chronic injuries—causation requires expert testimony | Temporal relation plus Wolfson’s opinion supports risk increase | Dose-response and medical science require expert proof | Chronic injury causation requires expert evidence; motion denied on this point |
Key Cases Cited
- Hull v. Eaton Corp., 825 F.2d 448 (D.C. Cir. 1987) (expert testimony required for complex causation questions; beyond lay knowledge)
- Williams v. Lucy Webb Hayes Nat'l Training Sch., 924 A.2d 1000 (D.C. 2007) (expert testimony not always required; complex medical questions dictate need)
- Int'l Sec. Corp. of Va. v. McQueen, 497 A.2d 1076 (D.C. 1985) (anti-guesswork rule; common sense permits causation in simple cases)
- Gass v. Marriott Hotel Servs., Inc., 558 F.3d 419 (6th Cir. 2009) (immediacy of symptoms supports causation without expert proof)
- Wills v. Amerada Hess Corp., 379 F.3d 32 (2d Cir. 2004) (causation in toxic torts requires expert testimony due to complexity)
- Johnson v. Arkema, Inc., 685 F.3d 452 (5th Cir. 2012) (temporal proof insufficient alone for chronic injuries; expert needed)
- Cavallo v. Star Enter., 892 F. Supp. 756 (E.D. Va. 1995) (illustrative on causation and expert necessity in toxic torts)