LINCOLN, Neb. (AP) — None of the state employees who were blamed for Nebraska’s prison sentence miscalculations will face criminal charges.

Nebraska Attorney General Jon Bruning and Lancaster County Attorney Joe Kelly announced the decision Monday as they released the findings of their investigation.

Bruning says some Department of Correctional Services employees were lazy and uninterested in their jobs, but prosecutors can’t prove that they intentionally violated the law. He pointed to George Green, the department’s top attorney, who resigned under threat of being fired.

Green later told a committee that he never read a Nebraska Supreme Court opinion that outlined the correct way to calculate sentences.

The county attorney’s office and Nebraska State Patrol both investigated the case, in which hundreds of prisoners were prematurely released.