Reference

How Mass Tort Cases Are Structured and Resolved

By David Meldofsky

Published May 18, 2026

A plain, primary-sourced explanation of how this litigation actually works, including the structural distinctions that most coverage gets wrong because getting them right does not generate clients. This page explains the machinery and rarely changes. For where each specific litigation stands right now, see the companion litigation status tracker, which is updated as dockets move.

What a multidistrict litigation actually is

Most large product and toxic-exposure cases are handled through a multidistrict litigation, almost always shortened to MDL. The mechanism comes from a single federal statute, 28 U.S.C. Section 1407. When many lawsuits filed in different federal courts share common factual questions, a body called the Judicial Panel on Multidistrict Litigation can transfer those cases to one federal judge in one district for coordinated pretrial proceedings.

The word to hold onto is pretrial. An MDL exists to run discovery, decide shared legal questions, fight out expert admissibility, and manage settlement once, instead of thousands of times in thousands of courtrooms. The transferee judge does not try every case. Unless a case settles or is reassigned, it is meant to return to the court it came from for trial. In practice the overwhelming majority never get there, because the MDL produces a resolution first.

Why an MDL is not a class action

This is the single most common misunderstanding, and a lot of marketing is content to leave it uncorrected because the phrase class action sounds reassuringly automatic.

In a class action, one or a few named plaintiffs represent everyone in the class, the case is certified by a court, and a single judgment or settlement binds the whole group on the same terms. In an MDL, every plaintiff still has their own individual lawsuit. There is no class, no class certification, and no single judgment that resolves everyone at once. Cases are grouped for efficiency, but each one keeps its own facts, its own value, and its own outcome.

Why it matters to a claimant: in an MDL, your individual facts, your diagnosis, your exposure history, and the strength of your documentation still determine what your case is worth. You are not a passive member of a group waiting for one verdict to land. The cases move together through the structure, but they are valued separately.

Bellwether trials, and why they decide everything

Because thousands of individual cases cannot all be tried, an MDL selects a small set of representative cases to go to trial first. These are bellwether trials. They are real trials with real verdicts for those specific plaintiffs, but their function is informational: they show both sides how juries actually respond to the evidence, the experts, and the core liability story.

A bellwether verdict does not legally bind the other cases. Its power is leverage. A string of large plaintiff verdicts pushes a defendant toward a broad settlement to stop the bleeding. A string of defense verdicts collapses settlement value and can end a litigation. Mixed results produce a more precise sense of which fact patterns are strong, which then shapes how settlements are tiered.

This is why the calendar around bellwethers matters more than almost anything else, and why a vacated or delayed bellwether date is a meaningful event, not a footnote. Until those test cases are tried, both sides are negotiating partly in the dark.

The four ways a mass tort resolves

Despite the variety of products and injuries, mass torts resolve through a small number of structures. Knowing which one a given litigation is using tells you more about your realistic timeline than any single news headline.

1. Aggregate settlement program

The most common endpoint. The parties negotiate a framework that resolves large numbers of individual cases through a claims process, usually with compensation tiered by injury type, exposure, and other factors. Money does not move when a settlement is announced. It moves after the framework is finalized, claims are documented and reviewed, and amounts are assigned, which typically takes many months and often longer.

2. Class-action settlement

Rare in personal-injury mass torts, because individual injuries vary too much to bind everyone to one set of terms. It is sometimes attempted to resolve future claims at once. When you see a proposed class settlement in a litigation that has otherwise been run as individual cases, expect contested approval fights and disputes over who is actually bound.

3. Bankruptcy trust

When liability threatens a company's solvency, claims can be channeled into a court-supervised trust that pays current and future claimants on a schedule. This is the long-established path in asbestos. It has also been attempted as a liability-management tactic by financially healthy companies through a maneuver of placing liabilities into a newly created subsidiary that then files for bankruptcy. Courts have rejected that tactic where the parent was not in genuine financial distress, which sends those cases back into ordinary litigation.

4. Statutory or administrative program

Occasionally a legislature creates the cause of action and the resolution path directly. The clearest current example is Camp Lejeune, covered next. These programs can offer a faster administrative settlement option running in parallel with the right to litigate, on terms set by statute and government policy rather than purely by private negotiation.

The Camp Lejeune exception

Camp Lejeune is routinely described as an MDL. It is not one, and the distinction is structural rather than pedantic.

The Camp Lejeune Justice Act, enacted in 2022 as Section 804 of the PACT Act, created the cause of action and, by statute, gave the United States District Court for the Eastern District of North Carolina exclusive jurisdiction and venue over these claims. Because Congress fixed jurisdiction and venue in one named district by law, the cases never entered the federal MDL system under Section 1407. There was no panel transfer because there was nothing for the panel to centralize. Every qualifying case was already required to be in the same court.

Separately, an early request to formally consolidate the Camp Lejeune cases for coordinated pretrial proceedings within that district was denied. The judges in the Eastern District of North Carolina later built their own coordinated structure, including a plaintiffs' leadership group and case-management orders, so the litigation now functions in an MDL-like way without being a JPML MDL. Alongside the lawsuits, the government created an administrative settlement path, the Elective Option, that runs in parallel with the right to sue.

The AFFF distinction almost everyone gets wrong

The firefighting foam litigation, formally the AFFF MDL in the District of South Carolina, is the clearest case of a structural distinction that is widely blurred because blurring it is useful to whoever is generating leads.

That MDL contains two fundamentally different kinds of claims on separate tracks. One track is brought by public water systems and municipalities for the cost of contamination and cleanup. The other is brought by individuals, largely firefighters, service members, and people in affected communities, for personal injuries such as specific cancers.

The very large settlement figures reported publicly in this litigation, the multibillion-dollar numbers, resolved the water-system claims. They are payments to utilities and public entities. They are not a fund for individual cancer claimants, and as a structural matter they do not pay personal-injury plaintiffs. The personal-injury track is a separate proceeding that, as of this writing, has not produced a global settlement for individuals.

Structural comparison across major litigations

This table compares structure, not status. These attributes change slowly, if at all. For current phase, case counts, and recent developments, use the status tracker.

How to read litigation news without being misled

Once the structure is clear, most misleading coverage falls into a few recognizable patterns. These rules of interpretation do not expire.

• A settlement being announced is not a payment. Money follows finalization, claims processing, and individual review, usually many months later. Headlines mark the start of that process, not the end.
• No global settlement does not mean a case is dead. Many active litigations have no settlement and are proceeding through discovery and bellwethers. Absence of a deal is a phase, not a verdict.
• A large reported number is not necessarily compensation for individuals. As with AFFF, settlement figures may resolve a different category of claimant entirely. Always ask which track and which kind of plaintiff a number refers to.
• Quiet does not mean inactive. Discovery and the wait for bellwethers are long and silent by design. Silence is the default state of a healthy mass tort, not evidence of a problem.
• Class action and MDL are not interchangeable. If a source uses them as synonyms, weigh its other claims accordingly.

How this page is sourced

This is reference material, so the basis for the load-bearing claims is stated openly rather than asserted. Structural claims here rest on primary authority, not on secondary commentary.

This page intentionally contains almost no dated figures or case counts. Those belong in the regularly updated status tracker, not in a structural reference, precisely so that this page stays accurate without constant revision.

Educational reference only. Not legal advice. No attorney-client relationship is created.