Article 85 of the Judicial Interpretation of the Criminal Procedure Law stipulates that an expert opinion shall not be used as the basis for finalizing the case if it has one of the following circumstances:

(a) the appraisal institution does not have the legal qualification, or the appraisal matters exceed the business scope and technical conditions of the appraisal institution;

(two) the appraiser does not have legal qualifications, does not have relevant professional skills or titles, or violates the withdrawal regulations;

(3) The sources of the materials and samples submitted for inspection are unknown, or the identification conditions are not available due to pollution;

(four) the identification object is inconsistent with the materials and samples submitted for inspection;

(five) the appraisal procedure is in violation of the provisions;

(six) the identification process and methods do not meet the requirements of relevant professional norms;

(seven) identity documents lack of signature and seal;

(eight) the expert opinion is irrelevant to the facts to be proved in the case;

(nine) other circumstances in violation of the relevant provisions.