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 this case from them, apply to the people's procuratorate or the people's court for collecting and obtaining evidence, or apply to the people's court for notifying 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.