Effective January 1, 2019, criminal discovery will be available via the eDiscovery Portal. Section 9-5.001 of the United States Attorney's Manual describes the Department's policy for disclosure of exculpatory and impeachment information.The Brady rule, named after Brady v. Maryland, requires prosecutors to disclose material, exculpatory information in the government's possession to the defense. The Massachusetts Trial Court Law Libraries make every effort to provide a current, accurate copy of the rules of court on this site. ▫ Discovery to the State. Thomas Alva Edison (February 11, 1847 – October 18, 1931) was an American inventor and businessman.