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

This week: The wide range of Roundup verdicts might be due in part to the varied decisions by judges on what evidence to allow into trials involving the EPA and foreign regulatory agencies. U.S. District Judge Edward Chen, in the Northern District of California, halted data breach cases against 23andMe over the objections of some plaintiffs’ lawyers. Find out who is representing defendants in antitrust lawsuits brought over diesel particulate filter services.