It depends on the specific situation. If it is approved by the court, it is effective. The lawyer's letter is issued in the name of a law firm. Opinions and opinions on some issues are the behavior of a unit and need to be stamped with the seal of the law firm. Whether the lawyer's letter is valid depends not on the authenticity of the lawyer's letter, but on whether the court approves it. Only the lawyer's letter approved by the court is valid. Article 33 of the Lawyers Law of People's Republic of China (PRC) * * * A lawyer who acts as a defender has the right to meet a criminal suspect or defendant in custody or under residential surveillance with a lawyer's practice certificate, a law firm certificate, a power of attorney or a power of attorney for legal aid in accordance with the provisions of the Criminal Procedure Law. Defense lawyers are not monitored when meeting with criminal suspects and defendants.
Legal objectivity:
Article 28 of the Lawyers Law 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.