China's top procuratorate released four case studies on Monday to highlight the importance of supervision when implementing laws or following legal procedures.

Topics touched upon in the release included the accurate application of criminal law, reviewing evidence and the dismissal of evidence gathered illegally, according to a statement from the Supreme People's Procuratorate.

One of the case studies concerned Ma Le, a former fund manager at Bosera Funds, who was given a three-year prison sentence for insider trading in December last year in Shenzhen, Guangdong province.

An alternative sentence of five years probation was rejected because the top prosecutor protested that it was not in line with criminal law, the statement said.

Another two cases involved Chen Man and Yu Yingsheng, two defendants who were acquitted due to insufficient evidence or unclear facts.

The pair had been wrongfully detained because their guilt had not been proven, the statement said, adding that prosecutors played a role in supervising whether the judgments were right in the two incidents.

The last case released on Monday concerned Wang Yulei, who had all charges against him dropped after prosecutors dismissed evidence that had been gathered illegally, the statement said, describing this as an example of prioritizing the protection of human rights.

An official of the top prosecuting body, whose name was not released in the statement, said that all four case studies would be useful in guiding the work of grassroots prosecutors, urging them to avoid wrongful prosecutions and improve their judicial supervision.