Article 41 of the Criminal Procedure Law
With the consent of witnesses or other relevant units and individuals, defense lawyers may collect materials related to the case from them, apply to the people's procuratorate or the people's court to collect and obtain evidence, or apply to the people's court to notify witnesses to testify in court.
With the permission of the people's procuratorate or the people's court, and with the consent of the victim or his close relatives or witnesses provided by the victim, the defense lawyer may collect materials related to the case from them.