Class Actions & Mass Torts Research Examples

Real Class Actions & Mass Torts research prompts, run end to end in Midpage — each with the full exchange, linked authorities, and citator treatment.

• Predominance in Product-Defect Classes

  How class certification works in the Sixth Circuit after Speerly v. General Motors — the en banc court’s structured two-step for commonality and predominance, the Wal-Mart one-stroke standard enforced element by element, the ban on deferring merits questions or culling uninjured class members after certification, and the first decisions applying and distinguishing the framework, from In re Humana to contested certification orders.

• Personal Jurisdiction in Mass Actions

  How Bristol-Myers Squibb’s forum-connection requirement travels beyond the state-court mass action — the Seventh Circuit’s party-status logic shielding absent Rule 23 class members in Mussat, the lopsided circuit split over FLSA collectives pitting Canaday, Fischer, and Luna Vanegas against the First Circuit’s Waters, and the forum arithmetic the split leaves for nationwide collectives and mass arbitration.

• Damages Models Under Comcast

  How courts test classwide damages models at Rule 23(b)(3) certification after Comcast Corp. v. Behrend — the fit requirement that a model measure only damages attributable to the certified theory of liability, the D.C. Circuit’s uninjured-members ceiling against the Ninth Circuit’s en banc rejection of a per se de minimis rule, and the supply-side conditions that decide whether conjoint analysis survives in consumer price-premium cases.

• General Causation & Daubert in MDLs

  How federal courts apply Federal Rule of Evidence 702 to general-causation experts in mass-tort MDLs after the December 2023 amendment — the proponent’s more-likely-than-not burden and the demand that an opinion stay within the bounds of its methodology, Daubert’s gatekeeping baseline, and how the acetaminophen, Roundup, and talc courts have policed the analytical gap between epidemiological data and causal conclusions.

• American Pipe Tolling Limits

  How to time-bar a stacked class action after China Agritech — the American Pipe baseline that still tolls individual claims during a pending class action, the Supreme Court’s refusal to let follow-on class complaints piggyback on earlier filings, the CalPERS rule that statutes of repose displace tolling entirely, and the state courts now adopting China Agritech for their own limitations law.

• Medical Monitoring Without Present Injury

  Which state supreme courts let plaintiffs recover medical monitoring without a present physical injury — the Potter and Bower line treating a reasonably certain need for surveillance as compensable harm, Donovan’s subcellular-change compromise, the Buckley, Henry, and Caronia line holding the gate at manifest injury, and the PFAS-era certified questions testing whether exposure alone still states a claim.