The presence of a lawyer can prevent the police or the prosecution from using interrogation techniques to induce confessions, effectively avoid extorting confessions by torture, effectively avoid answering questions that are not within the statutory obligation to answer, urge the police or the prosecution to handle cases according to law, and protect human rights to the maximum extent;
Because the law is a professional issue, and in order to protect human rights, the law stipulates that criminal cases must have defenders. If there is no defender, the state pays a lawyer to provide legal aid to the parties;
For the role of lawyers, see article 2.