Legal basis: Article 37 of the Criminal Procedure Law: Defenders shall, according to facts and laws, put forward materials and opinions on whether a criminal suspect or defendant is innocent, given a lighter punishment or exempted from criminal responsibility, and be responsible for safeguarding the litigation rights and other legitimate rights and interests of the criminal suspect or defendant.
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.