 As of October 2003, prosecutors of criminal cases must approve the defendant's request for DNA testing in certain cases.Monday, April 23, 2007, Jerry Miller became the 200th person in the United States exonerated through the use of DNA evidence.There is a national campaign in support of the formation of state Innocence Commissions, statewide entities that identify causes of wrongful convictions and develop state reforms that can improve the criminal justice system.