Can a lawyer provide evidence against the client?

Generally speaking, lawyers are obligated to keep confidential information that their clients and others are unwilling to disclose in their practice. However, criminal facts and information that endanger national security and public safety and other criminal facts and information that seriously endanger the personal and property safety of others are excluded. Therefore, it is against the lawyer's obligation to provide evidence against the client and make unfavorable remarks in court, but it is allowed if the purpose of providing such evidence is to use specific litigation strategies to turn such unfavorable evidence into powerful evidence. In a word, lawyers' court behavior should serve the interests of clients on the basis of observing the law.

Lawyer law:

Article 29 As a legal adviser, a lawyer shall, in accordance with the agreement, provide advice to the client on relevant legal issues, draft and review legal documents, participate in litigation, mediation or arbitration activities as an agent, handle other legal affairs entrusted, and safeguard the legitimate rights and interests of the client.

Article 30 A lawyer representing litigation legal affairs or non-litigation legal affairs shall safeguard the legitimate rights and interests of clients within the scope of entrustment.

Article 31 When acting as a defender, a lawyer shall, according to the facts and laws, put forward materials and opinions on acquittal, lighter punishment or reduction or exemption of criminal responsibility of criminal suspects and defendants, and safeguard the legitimate rights and interests of criminal suspects and defendants.

Article 38 A lawyer shall keep the state secrets and business secrets he knows in his practice, and shall not disclose the privacy of his clients. Lawyers should keep confidential the information and materials that their clients and others are unwilling to disclose in their practice activities. However, criminal facts and information that endanger national security, public safety and other serious personal and property safety of others are not included.