In the crime of drunk driving, the expert opinion of blood alcohol content has become
the main basis for conviction. In the court interrogation, the driver and his defense attorney have
also raised objections to the expert opinion, mainly including the procedure, method, subject and
standard of application of the expert opinion, and the judge’s attitude towards the objection is mostly
non adoptable or supportable. The main reasons are related to the authority of appraisal bodies and
appraisal opinions, the inadequacy of the party’s argument on objections, the dependence of judges on
appraisal opinions, and the slow and inadequate ideological transformation. Based on this, we should
standardize the procedure of blood sample extraction and identification, strengthen the implementation
of applicable norms for identification, standardize the regulation and management of identification
institutions and experts, avoid the problem of integration of investigation and identification, and
strengthen the transparency of identification procedures, which is conducive to better standardize the
identification procedures and enhance the evidentiary capacity of expert opinions.