Courts and police in the nation’s capital will change how they conduct lineups of suspects, when they notify defendants about informants and how long they retain criminal trial records, all in response to errors that have put innocent people in prison.

A task force created by D.C. Superior Court Chief Judge Lee F. Satterfield recommended that police use computers and staff not associated with a particular case to administer photo lineups to prevent influencing potential witnesses.

The court acknowledged that DNA often has cleared defendants long after their convictions, so officials will by March begin keeping trial records permanently rather than destroying them after 10 years.