legal ground
Article 146 of the Criminal Procedure Law
In order to find out the case, when it is necessary to solve the specialized problems in the case, personnel with specialized knowledge shall be employed for appraisal.
Article 147
After the appraiser conducts the appraisal, he shall write an appraisal opinion and sign it.
If an appraiser intentionally makes a false appraisal, he shall bear legal responsibility.
Article 148
The investigation organ shall inform the criminal suspect and the victim of the expert opinions used as evidence. If a criminal suspect or victim applies, he may make supplementary appraisal or re-appraisal.