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NEW YORK (AP) The New York City medical examiners' office would have to release data on training, protocols and proficiency testing for workers in its DNA evidence laboratory under newly passed legislation.

The City Council approved the requirements Thursday. They come after concerns about sloppy work prompted a review of 877 cases handled by one lab technician, who has since resigned.

The review found two instances of tests failing to identify DNA evidence that could have been used in prosecutions.

Mayor Michael Bloomberg's aides referred inquiries about the legislation to the medical examiner's office. The medical examiner's office hasn't immediately responded.

The agency told lawmakers in February that it had shaken up its management team and cracked down on underperforming technicians.