Whether it is administrative detention or criminal detention, if the parties refuse to sign the documents, the police will conduct video evidence collection before implementing relevant measures. If the parties do not sign, it will not affect the police's law enforcement.

The law provides that:

Article 33 The service of legal documents shall comply with the following provisions:

(1) If a penalty decision is made on the spot according to the summary procedure, it shall be delivered to the punished person on the spot, and the punished person shall sign or fingerprint the decision; If the person being punished refuses, the people's police handling the case shall indicate it in the filing decision;

(2) In addition to the provisions in the first paragraph of this paragraph, when making an administrative penalty or other administrative handling decision, the decision shall be delivered to the person being dealt with on the spot after the announcement, and the person being dealt with shall be deemed to have delivered it by signing the attached decision or pressing his fingerprint; If the person being treated refuses, the people's police handling the case shall indicate it in the attached decision; If the person being treated is not present, the public security organ shall deliver the decision to the person being treated within seven days, and the decision on administrative penalties for public security shall be delivered within two days.

The service of legal documents shall be directly delivered to the addressee himself; If the addressee is absent, it can be collected by his adult family members, the person in charge of the unit or the neighborhood (village) Committee where he lives. If the addressee himself or his agent refuses to accept or refuse to sign or fingerprint, the addressee may invite neighbors or other witnesses to be present to explain the situation, or record or video the refusal, leave the document at the addressee's place, indicate the reason for refusal and the date of delivery on the attached legal document, and the addressee and witness shall sign and fingerprint, which shall be deemed as service.

If it cannot be served directly, other public security organs shall be entrusted to serve it on their behalf or by mail.

If it cannot be delivered after the above delivery methods are adopted, it can be delivered by public announcement. The scope and method of the announcement shall be easy for citizens to know, and the announcement period shall not be less than 60 days.