Legal analysis: after the parties are detained, lawyers should immediately intervene in criminal cases and even criminal proceedings, and investigation, public prosecution and trial are all carried out around evidence. The prosecution's accusation of criminal facts and the judge's conviction and sentencing must be supported by corresponding evidence. Among many evidences, the confession and excuse of the criminal suspect can be said to be the core of these evidences. The investigation stage is the beginning of a criminal case and the basic stage to determine whether a criminal suspect has committed a crime and the severity of the crime. When the client is put into the detention center, his personal freedom is restricted, he is completely isolated from the outside world and relatively isolated, so it is difficult to keep a clear head to deal with the interrogation by the public security organs. In addition, many criminal suspects are not familiar with the law, and they don't know much about the nature of their actions, the rights they should enjoy when being interrogated, and how to make a more favorable confession without violating objective facts. In this case, the unfavorable confession will directly lead to the unfavorable situation in the court trial stage. If a professional criminal lawyer can intervene at the first time when the client is detained, it will undoubtedly help the suspect in time.
Legal basis: According to Article 28 of the Lawyers Law, lawyers can engage in the following businesses: (3) accepting the entrustment of criminal suspects and defendants in criminal cases or the appointment of legal aid agencies as defenders according to law, accepting the entrustment of private prosecutors in private prosecution cases, victims in public prosecution cases or their close relatives, acting as agents and participating in litigation; (seven) to understand the law and analyze relevant legal inquiries, and to write litigation documents and other documents related to legal affairs.