Article 50 of the Interpretation of the Criminal Procedure Law stipulates: "When a defense lawyer applies for collecting materials related to this case from the victim, his close relatives and witnesses provided by the victim, the people's court shall issue an investigation permit if it deems it necessary." Article 5 1 of this interpretation stipulates: "If the witness or the relevant unit or individual does not agree to the collection and collection of evidence related to this case, the defense lawyer shall apply to the people's court or notify the witness to testify in court, and the people's court shall agree if it deems it necessary." The first paragraph of Article 52 of this interpretation stipulates: "The defense lawyer directly applies to the people's court to collect and obtain evidence materials from witnesses or relevant units and individuals. If the people's court considers it really necessary to collect and obtain evidence materials, and it is inappropriate or impossible for the defense lawyer to collect and obtain evidence materials, it shall agree. When the people's court collects and collects evidence materials, the defense lawyer may be present. "