Legal analysis: 1. When investigating and collecting evidence, the defense lawyer must show the respondent the special letter of introduction, power of attorney and lawyer's practice license issued by the law firm, and it shall be conducted by two or more people. It may include lawyers from other law firms who are working on this case. 2. When investigating and collecting evidence, the defense lawyer may make audio and video recordings with the consent of the respondent. 3. When investigating and collecting evidence, the defense lawyer shall make an investigation record, which shall be signed by the investigators, witnesses or representatives of relevant participants such as grass-roots organizations, units and judicial organs. 5. Persons who are not competent for witness work due to objective reasons shall be noted in the recording materials, and relevant activities shall be recorded.
Legal basis: Article 37 of the Criminal Procedure Law of People's Republic of China (PRC), with the consent of witnesses or other relevant units and individuals, defense lawyers may collect materials related to this case from them, or apply to the people's procuratorate or people's court for collection and evidence collection, or apply to the people's court for notifying witnesses to testify in court. With the permission of the people's procuratorate and 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 him.