In the process of handling criminal cases, if the relevant units or individuals provide evidence on their own initiative, the public security organs will directly issue a list of accepted evidence materials in triplicate, indicating the number, name, quantity and characteristics of the evidence materials, which will be signed by the evidence submitter and the case-handling person (recipient), indicating the time of acceptance, and stamping the official seal of the case-handling (accepting) unit, and one copy will be kept by the case-handling unit.