Expert opinion refers to the special opinions expressed by experts in various industries on the specialized issues in the case (project). Expert opinion is one of the types of evidence in the field of criminal proceedings, and it is an important basis for finding out the case and solving some specialized problems in the case. The expert opinion used as evidence is directly related to the determination of the facts of the case, which is of great significance to all parties in criminal proceedings and has a direct interest in the criminal suspect and the victim. Therefore, article 146 of the criminal procedure law stipulates that 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.

First of all, the overall processing flow of criminal cases is

1, the first stage, report the case.

2. The second stage is public security investigation.

3. In the third stage, the case is filed and the case enters the investigation stage.

4. In the fourth stage, after the investigation, the public security organ submits the prosecution opinion, and the case enters the stage of examination and prosecution.

5, the fifth stage, the procuratorate review and prosecution stage.

6, the sixth stage, the trial stage.

II. Criminal jurisdiction includes:

1, functional jurisdiction

2. Trial jurisdiction

3. Level jurisdiction

4. Regional jurisdiction

5. Special jurisdiction

Legal basis: Criminal Procedure Law of People's Republic of China (PRC).

Article 146 When it is necessary to solve specialized problems in a case in order to find out the facts of the case, a person with specialized knowledge shall be employed for appraisal.

Article 147 After the appraisal is completed, the appraiser shall write an appraisal opinion and sign it. If an appraiser intentionally makes a false appraisal, he shall bear legal responsibility.

Article 148 If there is any objection to the expert opinion, the investigation organ shall inform the criminal suspect and the victim of the expert opinion used as evidence. If a criminal suspect or victim applies, he may make supplementary appraisal or re-appraisal.