ii. legal basis article 33 of the criminal procedure law, a criminal suspect or defendant may entrust one or two persons as defenders in addition to exercising the right of defense by himself. The following persons may be entrusted as defenders: (1) lawyers; (2) Personnel of the unit where the criminal suspect or defendant works recommended by people's organizations or people's organizations; (3) Guardians, relatives and friends of criminal suspects and defendants. A person who is being punished or deprived of personal freedom shall not act as a defender. A person who has been dismissed from public office or revoked the practice certificate of a lawyer or notary shall not act as a defender, except the guardian or near relative of a criminal suspect or defendant. Article 38 During investigation, defense lawyers may provide legal assistance to criminal suspects; Acting as an agent to appeal and accuse; Apply for changing compulsory measures; To understand the alleged crimes and cases of criminal suspects from the investigation organs and put forward opinions. Article 39 A defender may meet and correspond with a criminal suspect or defendant in custody. Other defenders, with the permission of the people's courts and people's procuratorates, may also meet and correspond with criminal suspects and defendants in custody. If a defense lawyer holds a lawyer's practice certificate, a law firm's certificate, a power of attorney or a letter of legal aid to ask for a meeting with the criminal suspect or defendant in custody, the detention center shall arrange the meeting in time, which shall not exceed 48 hours at the latest. If a defense lawyer meets a criminal suspect in custody during the investigation of a crime endangering national security or a terrorist activity, he shall obtain permission from the investigation organ. The investigation organ shall notify the detention center in advance in the above circumstances. The defense lawyer shall meet with the criminal suspect and defendant in custody to learn about the case; From the date when the case is transferred for examination and prosecution, the evidence may be verified with the criminal suspect or defendant. Defense lawyers are not monitored when meeting criminal suspects and defendants. According to the provisions of China's criminal procedure law, citizens can defend themselves, whether they are lawyers or not, but because the defense behavior involves many professional legal issues, lawyers are generally required to defend themselves. However, if lawyers themselves are defendants, they can clearly defend themselves, which involves the identification of relevant criminal facts and can be legally and reasonably defended by themselves.