"Researchers found 660 cases, ranging from mischaracterizing evidence to suborning perjury, yet in 527 of the cases judges upheld the convictions. It was also found that only one prosecutor was disciplined for their actions.
"In the handful of situations where..."
http://www.infowars.com/us-prosecutors-rarely-held-accountable-when-innocent-people-sent-to-prison/Vk