According to China's Criminal Procedure Law and its application in judicial practice, the defendant may entrust his relatives as his agents. If the client is a lawyer, there must be a "power of attorney" and an official letter from the law firm where the client is located. If the client is a citizen, a copy of the client's ID card and a copy of the client's ID card are required.
In criminal proceedings, a lawyer who accepts the entrustment of a party or is designated by a people's court as a criminal suspect or defendant in a criminal case shall go through the following procedures:
1. The entrustment formalities shall be handled by the law firm where the lawyer is located, and the client shall pay the defense fees in accordance with the relevant regulations.
2. Lawyers appointed by law firms defend criminal suspects or defendants and try their best to meet the naming requirements of clients when possible.
3. The assigned lawyer shall fill in the criminal acceptance form, and the law firm shall issue a reply. The power of attorney for defense is in triplicate, which is valid only after being signed by the criminal suspect and the defendant (or his legal representative).
4. The power of attorney is the legal basis for lawyers to perform their defense duties and participate in activities. The lawyer shall submit a power of attorney to the client, one of which shall be submitted to the people's court under the jurisdiction of the case together with the documents issued by the law firm to prove the lawyer's identity and perform the defense duties, and the other shall be properly kept and included in the defense file after the case is closed.