Rosa's Law (Pub. L. 111-256) is a United States law which replaces several instances of "mental retardation" in law with "intellectual disability." The bill was introduced as S.2781 in the United States Senate on November 17, 2009 by Barbara Mikulski (D-MD). It passed the Senate unanimously on August 5, 2010, then the House of Representatives on September 22, and was signed into law by President Barack Obama on October 5.[1]