Legal analysis: defense lawyers can provide legal aid to criminal suspects during investigation; 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. According to the above provisions, during the investigation, the defense lawyer can learn from the investigation organ about the charges charged by the criminal suspect and the main criminal facts that have been ascertained at that time, the situation that the criminal suspect was taken, changed or relieved of compulsory measures, and the situation that the investigation organ extended the investigation detention period.
Legal basis: Article 36 of the Criminal Procedure Law of People's Republic of China (PRC), defense lawyers can provide legal assistance to criminal suspects during investigation; 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.