legal ground
Article 38 of the Criminal Procedure Law: Defence lawyers may 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. Article 161 If a defense lawyer makes a request before the investigation of a case is completed, the investigation organ shall listen to the opinions of the defense lawyer and record them. If a defense lawyer puts forward a written opinion, it shall attach a volume.