Code of Professional Responsibility and Accountability (CPRA)
Section 17. Prohibition against conflict-of-interest representation; prospective clients. - In relation to prospective clients, the following rules shall be observed: (a) A lawyer shall, at the earliest opportunity, ascertain the existence of any conflict of interest between a prospective client and current clients, and immediately disclose the same if found to exist. In case of an objection by either the prospective or current client, the lawyer shall not accept the new engagement. (b) A lawyer shall maintain the private confidences of a prospective client even if no engagement materializes, and shall not use any such information to further his or her own interest, or the interest of any current client.