Legal analysis: law enforcement certificate is required to serve legal documents. According to the relevant regulations, the service of litigation documents must have a receipt, and the addressee should record the date of receipt, sign or seal it. If the addressee or an adult family member living together refuses to receive the litigation documents, the addressee may invite representatives of relevant grassroots organizations or units to be present, leave the litigation documents at the addressee's residence, or leave the litigation documents at the addressee's residence, and record the service process by taking photos, videos, etc. , it is deemed to have been delivered.
Legal basis: Article 84 of the Civil Procedure Law of People's Republic of China (PRC) stipulates that the service of litigation documents requires a receipt, and the addressee shall record the date of receipt and sign or seal the receipt. The date of receipt by the addressee on the service receipt shall be the date of service.