Legal basis: People's Republic of China (PRC) Lawyers Law.
Article 3 Lawyers must abide by the Constitution and laws, and strictly abide by lawyers' professional ethics and practice discipline. Lawyers' practice must be based on facts and take the law as the criterion. Lawyers' practice should be supervised by the state, society and the parties concerned. Lawyers' practice according to law is protected by law.
Article 27 A lawyer representing litigation legal affairs or non-litigation legal affairs shall safeguard the legitimate rights and interests of clients within the scope of entrustment.
Article 31 When acting as a defender, a lawyer shall, according to the facts and laws, put forward materials and opinions on acquittal, lighter punishment or reduction or exemption of criminal responsibility of criminal suspects and defendants, and safeguard the legitimate rights and interests of criminal suspects and defendants.