Judge Richard Leon of federal district court in Washington had a warning: anybody under 18 had to leave the courtroom immediately. Several court security officers checked IDs. Outside the courtroom, on the sixth floor of the trial court in downtown, there was a cadre of officers guarding the door.

Tuesday marked the opening of the government’s obscenity case against adult film producer John Stagliano and two of his companies, including Evil Angel Productions Inc. Stagliano was indicted in the U.S. District Court for the District of Columbia in 2008 on charges of producing two films that prosecutors allege have no artistic and scientific value.