Stanford Law Dean Jenny Martinez announced Wednesday that the diversity dean who scolded a federal judge during a protest melee is now on leave, but that the left-wing student activists who shouted down the judge will not be disciplined.

Instead, Ms. Martinez said that the law school will require all students to attend a half-day session on “freedom of speech and the norms of the legal profession.” The school will also develop a more detailed policy on permissible forms of protest.

Ms. Martinez also refused to walk back her March 11 apology to U.S. District Judge Kyle Duncan, who was jeered and continually interrupted by a crowd of about 100 student protesters at a March 9 lecture hosted by the conservative Stanford Federalist Society.

“I recognize that the course I have chosen will not please everyone, not least of which those who have demanded that I retract my apology to Judge Duncan and those who have demanded that students be immediately expelled,” said Ms. Martinez in a 10-page memo to the Stanford Law School community.

“But this is the course I believe best furthers our obligations as legal educators, charged with training future lawyers and preparing them to participate in a profession that undergirds the very fabric of our democracy and the rule of law,” she said.

Her decision to address the matter came after students papered her classroom last week with messages like “we have free speech rights too” while critics, including Republican Sen. Ted Cruz of Texas, called on Stanford to punish the students who disrupted Judge Duncan’s speech.