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

A New York jury begins deliberations in an opioid trial that ended with a last-minute motion for mistrial. A federal judge probing lawyers who worked with Tom Girardi on Lion Air crash settlements ordered bank records and briefs detailing his authority to sanction them all. Find out who filed the first lawsuit over last month’s mass shooting at a Michigan high school.