What is the role of lawyers in the three stages of criminal cases?

Legal analysis: first, the investigation stage: lawyers can provide legal help to criminal suspects in the investigation stage; Acting as an agent for complaints and accusations; Apply for changing compulsory measures; Ask the investigation organ about the crimes and cases suspected by the criminal suspect, and put forward opinions. Second, the stage of review and prosecution: lawyers mainly review various legal procedures, such as detention certificates and arrest warrants. At the same time, review whether these acts are legal. Third, the trial stage: this stage is a comprehensive embodiment of the lawyer's work. It is the last and most critical stage for lawyers to play their defense role.

Legal basis: Article 34 of the Criminal Procedure Law of People's Republic of China (PRC). A criminal suspect has the right to entrust a defender from the day when he is interrogated for the first time by the investigation organ or takes compulsory measures. During the investigation, only lawyers can be entrusted as defenders. The defendant has the right to entrust a defender at any time. When interrogating a criminal suspect for the first time or taking compulsory measures against him, the investigation organ shall inform him that he has the right to entrust a defender. The people's procuratorate shall, within three days from the date of receiving the case materials transferred for examination and prosecution, inform the criminal suspect that he has the right to entrust a defender. The people's court shall, within three days from the date of accepting the case, inform the defendant of the right to entrust a defender. If a criminal suspect or defendant requests to entrust a defender while in custody, the people's court, the people's procuratorate and the public security organ shall promptly convey it. If a criminal suspect or defendant is in custody, his guardian or near relative may also entrust a defender. After accepting the entrustment of a criminal suspect or defendant, the defender shall promptly inform the case-handling organ.