Welcome to Law.com Class Actions: Critical Mass, a weekly briefing for class action and mass tort attorneys. A federal judge in West Virginia sided with three drug distributors in a 184-page decision that came down nearly a year after the conclusion of an opioid trial. Some plaintiffs’ lawyers say lawsuits over prenatal acetaminophen use “will be one of the largest multidistrict litigations in the history of the United States.” Find out who is representing family members of those who died, and injured passengers, from an Amtrak train derailment in Missouri last week.

I’m Amanda Bronstad. Feel free to reach out to me with your input. My email is [email protected], or follow me on Twitter: @abronstadlaw.

SAN FRANCISCO, CA – MARCH 30, 2018: McKesson headquarters in San Francisco.

WV Decision Adds To ‘Checkered Landscape’ of Opioid Verdicts