Legal basis: Article 50 of the Code of Practice for Lawyers is under any of the following circumstances, lawyers and law firms may not establish or maintain an entrustment relationship with the parties:
(1) A lawyer acts as an agent for both parties in the same case, or represents legal affairs that have conflicts of interest with himself or his close relatives.
(4) An independent lawyer of the same law firm acts as the agent of the victim of the same criminal case and the defender of the criminal suspect or defendant at the same time, except that there is only one law firm in the county and it has been approved by the parties in advance;
(5) In civil litigation, administrative litigation and arbitration cases, the independent lawyer of the same law firm acts as the agent of both parties to the dispute at the same time, or the firm or its staff acts as one party and other lawyers of the firm act as the agent of the other party;
(6) In non-litigation business, lawyers of the same law firm also act as agents of interested parties, except those entrusted by the parties;
(seven) after the termination of the entrustment relationship, the same law firm or the same lawyer accepts the entrustment of the other party in the subsequent trial or disposal of the same case. The above basically covers all kinds of situations.