U.S. Department of Justice April 26, 2019 February 26, 2019 October 30, 2018 May 31, 2018 U.S. Attorney's Office for the District of Columbia October 31, 2019 April 3, 2019 May 18, 2018 September 14, 2017 August 15, 2017 February 23, 2018 (Use of Electronically Generated Subpoenas)