Is the on-board invigilator of Tieling Subject III a policeman?

That is, sitting in the position of the co-pilot of the subject three exam, the security officers are basically traffic police of the traffic police brigade. In order to prevent cheating, it is impossible for the coach to take the safety negative invigilator exam.

Personnel engaged in the driver's license examination shall hold the qualification certificate issued by the traffic management department of the provincial public security organ. The traffic administrative department of the public security organ shall select a sufficient number of full-time examiners among the public security police of the vehicle management office, and may be equipped with part-time examiners among the civilian staff of the public security police and the traffic administrative department of the public security organ. You can hire drivers, police supervisors and other personnel of transportation enterprises to undertake the duties of auxiliary evaluation and supervision of examinations.