(A) A member shall not reveal information protected from disclosure by Business and Professions Code section 6068, subdivision (e)(1) without the informed consent of the client, or as provided in paragraph (B) of this rule.
(B) A member may, but is not required to, reveal confidential information relating to the representation of a client to the extent that the member reasonably believes the disclosure is necessary to prevent a criminal act that the member reasonably believes is likely to result in death of, or substantial bodily harm to, an individual.
(C) Before revealing confidential information to prevent a criminal act as provided in paragraph (B), a member shall, if reasonable under the circumstances:
(D) In revealing confidential information as provided in paragraph (B), the member's disclosure must be no more than is necessary to prevent the criminal act, given the information known to the member at the time of the disclosure.
(E) A member who does not reveal information permitted by paragraph (B) does not violate this rule.
 Duty of confidentiality. Paragraph (A) relates to a member's obligations under Business and Professions Code section 6068, subdivision (e)(1), which provides it is a duty of a member: "To maintain inviolate the confidence, and at every peril to himself or herself to preserve the secrets, of his or her client." A member's duty to preserve the confidentiality of client information involves public policies of paramount importance. (In Re Jordan (1974) 12 Cal.3d 575, 580 [116 Cal.Rptr. 371].) Preserving the confidentiality of client information contributes to the trust that is the hallmark of the client-lawyer relationship. The client is thereby encouraged to seek legal assistance and to communicate fully and frankly with the lawyer even as to embarrassing or legally damaging subject matter. The lawyer needs this information to represent the client effectively and, if necessary, to advise the client to refrain from wrongful conduct. Almost without exception, clients come to lawyers in order to determine their rights and what is, in the complex of laws and regulations, deemed to be legal and correct. Based upon experience, lawyers know that almost all clients follow the advice given, and the law is upheld. Paragraph (A) thus recognizes a fundamental principle in the client-lawyer relationship, that, in the absence of the client's informed consent, a member must not reveal information relating to the representation. (See, e.g., Commercial Standard Title Co. v. Superior Court (1979) 92 Cal.App.3d 934, 945 [155 Cal.Rptr.393].)
 Client-lawyer confidentiality encompasses the attorney-client privilege, the work-product doctrine and ethical standards of confidentiality. The principle of client-lawyer confidentiality applies to information relating to the representation, whatever its source, and encompasses matters communicated in confidence by the client, and therefore protected by the attorney-client privilege, matters protected by the work product doctrine, and matters protected under ethical standards of confidentiality, all as established in law, rule and policy. (See In the Matter of Johnson (Rev. Dept. 2000) 4 Cal. State Bar Ct. Rptr. 179; Goldstein v. Lees (1975) 46 Cal.App.3d 614, 621 [120 Cal. Rptr. 253].) The attorney-client privilege and work-product doctrine apply in judicial and other proceedings in which a member may be called as a witness or be otherwise compelled to produce evidence concerning a client. A member's ethical duty of confidentiality is not so limited in its scope of protection for the client-lawyer relationship of trust and prevents a member from revealing the client's confidential information even when not confronted with such compulsion. Thus, a member may not reveal such information except with the consent of the client or as authorized or required by the State Bar Act, these rules, or other law.
 Narrow exception to duty of confidentiality under this Rule. Notwithstanding the important public policies promoted by lawyers adhering to the core duty of confidentiality, the overriding value of life permits disclosures otherwise prohibited under Business & Professions Code section 6068(e), subdivision (1). Paragraph (B), which restates Business and Professions Code section 6068, subdivision (e)(2), identifies a narrow confidentiality exception, absent the client's informed consent, when a member reasonably believes that disclosure is necessary to prevent a criminal act that the member reasonably believes is likely to result in the death of, or substantial bodily harm to an individual. Evidence Code section 956.5, which relates to the evidentiary attorney-client privilege, sets forth a similar express exception. Although a member is not permitted to reveal confidential information concerning a client's past, completed criminal acts, the policy favoring the preservation of human life that underlies this exception to the duty of confidentiality and the evidentiary privilege permits disclosure to prevent a future or ongoing criminal act.
 Member not subject to discipline for revealing confidential information as permitted under this Rule. Rule 3-100, which restates Business and Professions Code section 6068, subdivision (e)(2), reflects a balancing between the interests of preserving client confidentiality and of preventing a criminal act that a member reasonably believes is likely to result in death or substantial bodily harm to an individual. A member who reveals information as permitted under this rule is not subject to discipline.
 No duty to reveal confidential information. Neither Business and Professions Code section 6068, subdivision (e)(2) nor this rule imposes an affirmative obligation on a member to reveal information in order to prevent harm. (See rule 1-100(A).) A member may decide not to reveal confidential information. Whether a member chooses to reveal confidential information as permitted under this rule is a matter for the individual member to decide, based on all the facts and circumstances, such as those discussed in paragraph  of this discussion.
 Deciding to reveal confidential information as permitted under paragraph (B). Disclosure permitted under paragraph (B) is ordinarily a last resort, when no other available action is reasonably likely to prevent the criminal act. Prior to revealing information as permitted under paragraph (B), the member must, if reasonable under the circumstances, make a good faith effort to persuade the client to take steps to avoid the criminal act or threatened harm. Among the factors to be considered in determining whether to disclose confidential information are the following:
- the amount of time that the member has to make a decision about disclosure;
- whether the client or a third party has made similar threats before and whether they have ever acted or attempted to act upon them;
- whether the member believes the member's efforts to persuade the client or a third person not to engage in the criminal conduct have or have not been successful;
- the extent of adverse effect to the client's rights under the Fifth, Sixth and Fourteenth Amendments of the United States Constitution and analogous rights and privacy rights under Article 1 of the Constitution of the State of California that may result from disclosure contemplated by the member;
- the extent of other adverse effects to the client that may result from disclosure contemplated by the member; and
- the nature and extent of information that must be disclosed to prevent the criminal act or threatened harm.
A member may also consider whether the prospective harm to the victim or victims is imminent in deciding whether to disclose the confidential information. However, the imminence of the harm is not a prerequisite to disclosure and a member may disclose the information without waiting until immediately before the harm is likely to occur.
 Counseling client or third person not to commit a criminal act reasonably likely to result in death of substantial bodily harm. Subparagraph (C)(1) provides that before a member may reveal confidential information, the member must, if reasonable under the circumstances, make a good faith effort to persuade the client not to commit or to continue the criminal act, or to persuade the client to otherwise pursue a course of conduct that will prevent the threatened death or substantial bodily harm, or if necessary, do both. The interests protected by such counseling is the client's interest in limiting disclosure of confidential information and in taking responsible action to deal with situations attributable to the client. If a client, whether in response to the member's counseling or otherwise, takes corrective action - such as by ceasing the criminal act before harm is caused - the option for permissive disclosure by the member would cease as the threat posed by the criminal act would no longer be present. When the actor is a nonclient or when the act is deliberate or malicious, the member who contemplates making adverse disclosure of confidential information may reasonably conclude that the compelling interests of the member or others in their own personal safety preclude personal contact with the actor. Before counseling an actor who is a nonclient, the member should, if reasonable under the circumstances, first advise the client of the member's intended course of action. If a client or another person has already acted but the intended harm has not yet occurred, the member should consider, if reasonable under the circumstances, efforts to persuade the client or third person to warn the victim or consider other appropriate action to prevent the harm. Even when the member has concluded that paragraph (B) does not permit the member to reveal confidential information, the member nevertheless is permitted to counsel the client as to why it may be in the client's best interest to consent to the attorney's disclosure of that information.
 Disclosure of confidential information must be no more than is reasonably necessary to prevent the criminal act. Under paragraph (D), disclosure of confidential information, when made, must be no more extensive than the member reasonably believes necessary to prevent the criminal act. Disclosure should allow access to the confidential information to only those persons who the member reasonably believes can act to prevent the harm. Under some circumstances, a member may determine that the best course to pursue is to make an anonymous disclosure to the potential victim or relevant law-enforcement authorities. What particular measures are reasonable depends on the circumstances known to the member. Relevant circumstances include the time available, whether the victim might be unaware of the threat, the member's prior course of dealings with the client, and the extent of the adverse effect on the client that may result from the disclosure contemplated by the member.
 Informing client of member's ability or decision to reveal confidential information under subparagraph (C)(2). A member is required to keep a client reasonably informed about significant developments regarding the employment or representation. Rule 3-500; Business and Professions Code, section 6068, subdivision (m). Paragraph (C)(2), however, recognizes that under certain circumstances, informing a client of the member's ability or decision to reveal confidential information under paragraph (B) would likely increase the risk of death or substantial bodily harm, not only to the originally-intended victims of the criminal act, but also to the client or members of the client's family, or to the member or the member's family or associates. Therefore, paragraph (C)(2) requires a member to inform the client of the member's ability or decision to reveal confidential information as provided in paragraph (B) only if it is reasonable to do so under the circumstances. Paragraph (C)(2) further recognizes that the appropriate time for the member to inform the client may vary depending upon the circumstances. (See paragraph  of this discussion.) Among the factors to be considered in determining an appropriate time, if any, to inform a client are:
- whether the client is an experienced user of legal services;
- the frequency of the member's contact with the client;
- the nature and length of the professional relationship with the client;
- whether the member and client have discussed the member's duty of confidentiality or any exceptions to that duty;
- the likelihood that the client's matter will involve information within paragraph (B);
- the member's belief, if applicable, that so informing the client is likely to increase the likelihood that a criminal act likely to result in the death of, or substantial bodily harm to, an individual; and
- the member's belief, if applicable, that good faith efforts to persuade a client not to act on a threat have failed.
 Avoiding a chilling effect on the lawyer-client relationship. The foregoing flexible approach to the member's informing a client of his or her ability or decision to reveal confidential information recognizes the concern that informing a client about limits on confidentiality may have a chilling effect on client communication. (See Discussion paragraph .) To avoid that chilling effect, one member may choose to inform the client of the member's ability to reveal information as early as the outset of the representation, while another member may choose to inform a client only at a point when that client has imparted information that may fall under paragraph (B), or even choose not to inform a client until such time as the member attempts to counsel the client as contemplated in Discussion paragraph . In each situation, the member will have discharged properly the requirement under subparagraph (C)(2), and will not be subject to discipline.
 Informing client that disclosure has been made; termination of the lawyer-client relationship. When a member has revealed confidential information under paragraph (B), in all but extraordinary cases the relationship between member and client will have deteriorated so as to make the member's representation of the client impossible. Therefore, the member is required to seek to withdraw from the representation (see rule 3-700(B)), unless the member is able to obtain the client's informed consent to the member's continued representation. The member must inform the client of the fact of the member's disclosure unless the member has a compelling interest in not informing the client, such as to protect the member, the member's family or a third person from the risk of death or substantial bodily harm.
 Other consequences of the member's disclosure. Depending upon the circumstances of a member's disclosure of confidential information, there may be other important issues that a member must address. For example, if a member will be called as a witness in the client's matter, then rule 5-210 should be considered. Similarly, the member should consider his or her duties of loyalty and competency (rule 3-110).
 Other exceptions to confidentiality under California law. Rule 3-100 is not intended to augment, diminish, or preclude reliance upon, any other exceptions to the duty to preserve the confidentiality of client information recognized under California law. (Added by order of the Supreme Court, operative July 1, 2004.)