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

This week: In Tom Girardi’s criminal trial, an IRS special agent showed jurors flow charts and graphs of how money moved through Girardi Keese bank accounts. In a big win for Bayer, the U.S. Court of Appeals for the Third Circuit split with the Ninth and Eleventh circuits on whether federal law preempted Roundup claims. The manufacturers of implanted port catheter medical devices brought in defense counsel in dozens of product liability lawsuits.