Code of Professional Responsibility and Accountability (CPRA)
Section 15. Conflict of interest of a lawyer hired by a law firm. - When a lawyer joins a law firm, it shall be the duty of the lawyer to disclose to the law firm, at the earliest possible opportunity, his or her previous clients that may have a potential conflict of interest with the current clients of the law firm. If there is a potential conflict of interest, the lawyer shall not act on the case or cases of the affected current client.