?A licensed lawyer, as a defendant, can conduct an investigation with a practicing license and a letter of introduction from a law firm. "Investigating Plaintiff" is not specific enough to answer further.
?The provisions of laws and regulations on the right of practicing lawyers to investigate and collect evidence are summarized as follows:
?According to Article 33 of my country's "Lawyers Law", a criminal suspect is interrogated for the first time by the investigation agency Or after compulsory measures are taken, the entrusted lawyer has the right to meet with the criminal suspect or defendant to learn about the case based on his lawyer's practice certificate, law firm certification and power of attorney or official legal aid letter. Lawyers' meetings with criminal suspects and defendants must not be monitored.
?Article 34 The entrusted lawyer has the right to inspect, excerpt, and copy the litigation documents and case file materials related to the case from the date of prosecution. The entrusted lawyer has the right to inspect, extract, and copy all materials related to the case from the date the case is accepted by the People's Court.
?Article 35: Based on the needs of handling the case, the entrusted lawyer may 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 appear in court to testify.
If a lawyer investigates and collects evidence on his own, he can contact the relevant unit or individual under investigation and the person handling the legal affairs with his lawyer's practicing certificate and law firm certificate.
?According to Article 36 of my country’s Criminal Procedure Law, defense lawyers may consult, excerpt, and copy the litigation documents, technical appraisal certificates and other materials of this case from the date of review of the prosecution by the People’s Procuratorate. Can meet and communicate with criminal suspects in custody. Other defenders may also consult, excerpt, and copy the above-mentioned materials with the permission of the People's Procuratorate, and may meet and correspond with criminal suspects in custody.
From the date the People's Court accepts the case, the defender may review, excerpt, and copy the materials on the criminal facts charged in the case, and may meet with and correspond with the defendant in custody. With the permission of the People's Court, other defenders may also review, excerpt, and copy the above-mentioned materials, meet with the defendant in custody, and correspond with each other.
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?Article 37: With the consent of witnesses or other relevant units and individuals, defense lawyers may collect materials related to the case from them, or apply to the People's Procuratorate or People's Court Collect and obtain evidence, or apply to the people's court to notify witnesses to appear in court to testify.
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 the witnesses provided by the victim, the defense lawyer may collect materials related to the case from them.
?According to the "Interpretation of the Supreme People's Court on Several Issues Concerning the Execution of the Criminal Procedure Law of the People's Republic of China"
Article 43 The defense lawyer applies to the victim If the people's court deems it necessary to collect materials related to the case, the people's court shall allow it and issue a letter of approval for investigation.
Article 44: A defense lawyer collects and obtains materials related to the case from witnesses or other relevant units and individuals, and applies to the people's court to collect or obtain materials because the witnesses, relevant units and individuals do not agree. , the people's court shall agree if it deems it necessary.
Article 45 If a defense lawyer applies directly to the People’s Court to collect or obtain evidence, and the People’s Court considers that it is inappropriate or impossible for the defense lawyer to collect or obtain evidence from witnesses or other relevant units and individuals, it is really necessary. , should be agreed.
Applicants may be present when the people's court applies for evidence collection and acquisition by defense lawyers.
The people's court shall promptly copy and transfer the evidence submitted by the defense lawyer to the applicant.
?Article 46: The defense lawyer files an application in accordance with the provisions of Article 43, Article 44, and Article 45, paragraph 1, of this Interpretation, It should be made in writing, stating the reasons and an outline of the questions to be investigated.