China's top female forensic expert said she decided to quit the Chinese Forensic Medicine Association and the profession over Ma Yue's case.

Wang Xuemei, the first female forensic doctor of the Supreme People's Procuratorate, made public her decision on Saturday in a video released with a micro blog posting by Ma's mother, whose son died in Beijing's subway in 2010.

Wang said the result from the association was ridiculous, making her greatly ashamed of the appraisal, according to the micro blog.