According to the relevant laws and regulations, when several appraisers identify the same person or the same article, each appraiser should conduct it alone. When necessary, witnesses may be present.

Legal basis: Provisions on Procedures of Public Security Organs Handling Criminal Cases

Article 250 When several appraisers appraise the same appraisal object, they shall appraise it separately. The investigators responsible for the appraisal shall not be less than two.

Article 251 During the appraisal, the object of appraisal shall be mixed with other objects with similar characteristics, and no hint shall be given to the appraiser. When identifying a criminal suspect, the number of people to be identified shall not be less than seven; There shall be no less than ten photos to identify the criminal suspect; When identifying articles, there shall be no less than five mixed articles of the same kind.

When a specific identification object, such as a place or a corpse, is identified, or the identifier can accurately describe the unique characteristics of the article, the number of foils is not limited.