A proposed $2.2 million settlement of a case that started with the arrests of hundreds of protesters in 2002 would change how U.S. Park Police handle mass arrests.

U.S. District Judge Emmet Sullivan issued preliminary approval for the settlement of the 12-year-old class action lawsuit last week. The lawsuit stems from about 400 arrests during International Monetary Fund and World Bank meetings in 2002.

The settlement outlines changes to policies for the U.S. Park Police, who are responsible for areas in front of the White House and other key security sites. The changes include prohibiting encircling protesters with police lines, requiring particularized probable cause for any protester arrest, and giving fair notice before arrests. An $8.25 million settlement with D.C. police in 2010 declared all arrests null and void.