What’s the news: In an unprecedented three-day hearing this week, Judge Richard Leon of the U.S. District Court for the District of Columbia will hear from six witnesses about the $70 billion merger of pharmacy giant CVS Corp. and mega-insurer Aetna Inc. The U.S. Department of Justice (DOJ) decided in October 2018 to allow the merger after requiring a divestiture of Aetna’s Medicare Part D business.

Judge Leon’s decision to hold a hearing that includes live witnesses as part of a Tunney Act review of the DOJ action is a first, antitrust experts say.

My latest for the AMA. The whole shebang.