A news story breaks. A drug manufacturer has announced the surprising results of a recent study suggesting a dangerous side effect to a popular drug. Newspapers, television shows, and websites trumpet the story for days, even weeks, and speculation swirls about how many people might already have been aff ected. The drug is withdrawn from the market or distributed with new labeling. Lawyer advertisements continue the story as the news stories taper off. Within a month, lawsuits have been fi led across the country. A mass tort has begun. But when does it end? ...