Welcome to Law.com Class Actions: Critical Mass, a weekly briefing for class action and mass tort attorneys.

This week: Plaintiffs’ lawyers in federal court argued on Tuesday to exclude Monsanto expert Dr. Cristian Tomasetti, who has testified in numerous Roundup trials. More than a dozen lawsuits have been filed over Suboxone, used to treat opioid addiction. Find out who was named to lead lawsuits over insulin pricing.