Legal basis: Article 37 of the Administrative Punishment Law of the People's Republic of China. When an administrative organ conducts an investigation or inspection, there shall be no less than two law enforcement personnel, and they shall show their certificates to the parties concerned or relevant personnel. The parties concerned or relevant personnel shall truthfully answer the inquiry and assist in the investigation or inspection, and shall not obstruct it. A record shall be made of the inquiry or inspection.
When collecting evidence, the administrative organ may adopt the method of sampling for evidence collection; In the case that the evidence may be lost or difficult to obtain later, it may be registered and preserved in advance with the approval of the person in charge of the administrative organ, and a decision on handling it shall be made in time within seven days. During this period, the parties concerned or relevant personnel shall not destroy or transfer the evidence.
Law enforcement officers who have a direct interest with the parties concerned shall withdraw.