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Mass tort and product liability expert witnesses

Expert class library · 10 classes

The causation, engineering and regulatory experts in MDLs and product cases: epidemiology, dose-response, specific causation, design defect, warnings and FDA practice.

Each class is defined by role and method, never by a person or a firm. Open one for what its testimony turns on, how it is attacked, and the rulings, each summarised from the opinion and linked to it.

Usually retained by plaintiffs

General-causation epidemiologist

Bradford Hill causation analysis · Weight-of-the-evidence review

Specific-causation physician

Differential etiology · Medical record review

Product design engineer

Alternative design analysis · Failure mode analysis

Cumulative exposure causation expert (asbestos)

Cumulative dose theory · Fiber type potency analysis

Pharmacovigilance and signal detection expert

FAERS and MAUDE data mining · Disproportionality analysis (PRR, ROR)

Retained by either side

Toxicologist (dose-response)

Dose-response assessment · Exposure reconstruction

Warnings and human factors expert

Warning adequacy analysis · ANSI Z535 standards review

FDA regulatory expert

Regulatory history review · Labeling change analysis

Biostatistician (meta-analysis)

Fixed and random effects meta-analysis · Heterogeneity testing

Medical device engineer

Design history file review · Bench and fatigue testing

Recent rulings

The 12 most recent of 39 rulings in this practice, newest first. Each links to the free opinion on CourtListener and to the class it belongs to.

OutcomeCaseCourtExpert class
Exclusion reversedRutledge v. Walgreen Co.No. 24-9162d Cir. 2026General-causation epidemiologist
ExcludedIn re Zantac (Ranitidine) LitigationNo. 255, 2024Del. 2025General-causation epidemiologist
ExcludedSprafka v. Medical Device Business Services, Inc.139 F.4th 6568th Cir. 2025Medical device engineer
AdmittedCohen v. Boston Scientific Corp.2024 DNH 026D.N.H. 2024Medical device engineer
ExcludedIn re Onglyza (Saxagliptin) and Kombiglyze (Saxagliptin and Metformin) Prods. Liability Litig.93 F.4th 3396th Cir. 2024General-causation epidemiologist
ExcludedJenkins v. BP Exploration & Production Inc.No. 23-1153511th Cir. 2024Toxicologist (dose-response)
Exclusion reversedAnderson v. Raymond Corp.61 F.4th 5057th Cir. 2023Product design engineer
AdmittedGlenn v. 3M Co.Op. No. 5975 (S.C. Ct. App. Apr. 5, 2023)S.C. Ct. App. 2023Cumulative exposure causation expert (asbestos)
ExcludedLancaster v. BNSF Railway Co.75 F.4th 9678th Cir. 2023Specific-causation physician
Exclusion reversedAmador v. 3M Co.No. 19-28998th Cir. 2021General-causation epidemiologist
AdmittedHardeman v. Monsanto Co.997 F.3d 9419th Cir. 2021General-causation epidemiologist
AdmittedHardeman v. Monsanto Co.997 F.3d 9419th Cir. 2021Toxicologist (dose-response)

Other practice areas

  • Antitrust
  • Securities
  • Commercial
  • Intellectual property
  • Environmental and toxic tort
  • Personal injury
  • Transportation
  • Employment
  • Consumer class actions
  • Medical malpractice
  • Product engineering
  • Civil rights
  • Forensic science
  • Healthcare fraud and False Claims Act
  • Family law
  • Insurance
  • Construction
  • Bankruptcy and valuation
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The library summarises public decisions for orientation; it is not legal advice. Read the opinion before relying on any ruling. No individual expert is named.

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