Bellwether Trial

A bellwether trial is a trial of one selected case from a large group of similar lawsuits, used to test how juries respond to the evidence. The name comes from the bellwether sheep, which wore a bell and led the flock. In multidistrict litigation, the judge usually oversees a process in which each side picks cases, or cases are chosen randomly, from a smaller pool. The goal is a set of trials that represents the range of injuries and facts across the litigation.

Bellwether verdicts are not binding on other plaintiffs. Each remaining case keeps its own right to a trial. Their main value is information: a string of plaintiff wins tends to push defendants toward a global settlement, while defense wins or dismissals tend to lower settlement values or lead plaintiffs to drop weak claims. Cases selected for bellwether trials are sometimes dismissed or settled right before trial, which is why schedules often change.

The 3M Combat Arms earplug litigation shows how bellwethers shape an outcome. After a series of bellwether trials in the federal MDL in Florida produced verdicts on both sides, 3M agreed in August 2023 to pay $6 billion to resolve the earplug lawsuits. Roundup cancer litigation has similarly been shaped by trial results in both state and federal courts.

If you have a case in an MDL, you may never go to trial yourself; your lawyer will explain whether your case is in a bellwether pool. For plaintiffs chosen, it means more discovery, including depositions and medical exams. See what an MDL is, the Roundup cancer lawsuit, the 3M earplug and burn pit claims page, and the mass tort entry.