You can't. The Supreme People's Court, the Supreme People's Procuratorate, the Ministry of Public Security, the Ministry of National Security and the Ministry of Justice jointly issued the Working Measures for Lawyers on Duty in Legal Aid. Article 2 A lawyer on duty refers to a lawyer whose legal aid institutions set up legal aid workstations in detention centers, people's procuratorates, people's courts and other places to provide legal aid to criminal suspects and defendants without defenders through stationing or arranging. The object of duty lawyer's service is criminal suspects and defendants without defenders. The lawyer on duty is a category of legal aid and a supplement to the defense system, but it cannot be equated with defense. When there is a defender entrusted by the criminal suspect or defendant (or family member) or designated by the state, the lawyer on duty will have no working space, which is also the proper meaning of effectively protecting the defense rights of the criminal suspect, defendant and defender.
legal ground
Article 2 of the Working Measures for Lawyers on Duty in Legal Aid refers to lawyers whose legal aid institutions set up legal aid workstations in detention centers, people's procuratorates, people's courts and other places to provide legal aid to criminal suspects and defendants without defenders through stationing or arranging.