Can a lawyer check the defendant's social security?

Lawyers have no legal right to consult, but they can inquire after accepting the entrustment of the parties or entrusted units.

Legal basis:

People's Republic of China (PRC) Lawyers Law

Article 28 A lawyer may engage in the following businesses: (1) Accepting the entrustment of a natural person, legal person or other organization to act as a legal adviser; (two) to accept the entrustment of the parties in civil cases and administrative cases, to act as agents and to participate in litigation; (3) Accepting the entrustment of criminal suspects and defendants in criminal cases or legal aid agencies to act as defenders according to law, accepting the entrustment of private prosecutors in private prosecution cases, victims in public prosecution cases or their close relatives to participate in litigation as agents; (four) to accept the entrustment and represent the complaints of various litigation cases; (five) to accept the entrustment and participate in mediation and arbitration activities; (6) Accepting entrustment to provide non-litigation legal services; (seven) to answer questions about the law and write litigation documents and other documents related to legal affairs.

Article 35 An entrusted lawyer may, according to the needs of a case, apply to a people's procuratorate or a people's court to collect and obtain evidence, or apply to a people's court to notify witnesses to testify in court. If a lawyer investigates and collects evidence by himself, he may, with the lawyer's practice certificate and the certificate of the law firm, investigate the situation related to undertaking legal affairs with the relevant units or individuals.