Drug maker Pfizer is opposing a plaintiff’s request to have her case remanded back to state court in the Effexor products liability litigation, arguing that California plaintiffs have been joining drug distributor McKesson in order to destroy diversity jurisdiction and prevent manufacturers from keeping cases in federal court.

“Joining McKesson has become a popular tactic for destroying diversity and preventing manufacturer defendants from proceeding in federal court,” defense attorney Mark S. Cheffo, of Quinn Emanuel Urquhart & Sullivan in New York, wrote.