Implement the principle of presumption of innocence to prevent and correct miscarriages of justice. In 2013, the Ministry of Public Security issued the Notice on Further Strengthening and Improving Law Enforcement to Prevent Miscarriages of Justice and some other documents to prevent cases of misjudgment and to strengthen comprehensive, complete and real-time scrutiny of law enforcement to prevent miscarriages of justice at source. The Ministry of Justice issued the Opinions on Maximizing the Functions of the Forensic Assessment System to Prevent Miscarriages of Justice to strengthen forensic assessment management and further regulate such activities. The Supreme People's Procuratorate released Several Opinions on Effectively Performing Procuratorial Functions to Prevent and Correct Miscarriages of Justice, scrutinizing all activities concerning evidence, procedures and application of laws and to improve the system of discovery, correction, and prevention of cases of misjudgment, and to hold to account those responsible. In 2015, the procuratorial organs at all levels decided not to arrest 131,675 people and not to prosecute 25,778 in cases involving lack of evidence or actions that do not constitute a crime. In addition, they appealed against 6,591 judgments of criminal cases that they deemed wrong judgments. The Supreme People's Court issued the Opinions on Establishing and Improving the Working Mechanisms for the Prevention of Miscarriages of Justice in Criminal Cases, stipulating that the defendants should be acquitted for lack of evidence and no one should be prosecuted without criminal evidence. From 2012 to 2015, people's courts at all levels acquitted 3,369 defendants. A number of wrongful convictions were overturned in accordance with the law. These included the following cases:

. rape and murder by Zhang Hui and Zhang Gaoping, nephew and uncle

. poisoning by Nian Bin

. rape and murder by Hugjiltu

. rape and murder by Xu Hui

. murder by Huang Jiaguang

. rape and murder by Wang Benyu

. murder by Yu Yingsheng

. murder and arson by Chen Man

. poisoning by Qian Renfeng

. murder by Xu Jinlong

. murder by Yang Ming