We have previously editorialized on U.S. District Court Judge Aileen Cannon's appointment of a special master to review materials seized from former President Donald T. Trump's Mar-a-Lago Estate. Now the U.S. Court of Appeals for the Eleventh Circuit has held that Judge Cannon improperly exercised equitable jurisdiction in appointing a special master. It vacated her order and the Justice Department regained access to all the seized documents for use in its criminal investigation.