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ABA Model Rules of Professional Conduct
Comment - Rule 1.7
Loyalty to a Client
 Loyalty is an essential element in the lawyer's relationship to a client. An impermissible conflict of interest may exist before representation is undertaken, in which event the representation should be declined. The lawyer should adopt reasonable procedures, appropriate for the size and type of firm and practice, to determine in both litigation and non-litigation matters the parties and issues involved and to determine whether there are actual or potential conflicts of interest.
 If such a conflict arises after representation has been undertaken, the lawyer should withdraw from the representation. See Rule 1.16. Where more than one client is involved and the lawyer withdraws because a conflict arises after representation, whether the lawyer may continue to represent any of the clients is determined by Rule 1.9. See also Rule 2.2(c). As to whether a client-lawyer relationship exists or, having once been established, is continuing, see Comment to Rule 1.3 and Scope.
 As a general proposition, loyalty to a client prohibits undertaking representation directly adverse to that client without that client's consent. Paragraph (a) expresses that general rule. Thus, a lawyer ordinarily may not act as advocate against a person the lawyer represents in some other matter, even if it is wholly unrelated. On the other hand, simultaneous representation in unrelated matters of clients whose interests are only generally adverse, such as competing economic enterprises, does not require consent of the respective clients. Paragraph (a) applies only when the representation of one client would be directly adverse to the other.
 Loyalty to a client is also impaired when a lawyer cannot consider, recommend or carry out an appropriate course of action for the client because of the lawyer's other responsibilities or interests. The conflict in effect forecloses alternatives that would otherwise be available to the client. Paragraph (b) addresses such situations. A possible conflict does not itself preclude the representation. The critical questions are the likelihood that a conflict will eventuate and, if it does, whether it will materially interfere with the lawyer's independent professional judgment in considering alternatives or foreclose courses of action that reasonably should be pursued on behalf of the client. Consideration should be given to whether the client wishes to accommodate the other interest involved.
Consultation and Consent
 A client may consent to representation notwithstanding a conflict. However, as indicated in paragraph (a)(1) with respect to representation directly adverse to a client, and paragraph (b)(1) with respect to material limitations on representation of a client, when a disinterested lawyer would conclude that the client should not agree to the representation under the circumstances, the lawyer involved cannot properly ask for such agreement or provide representation on the basis of the client's consent. When more than one client is involved, the question of conflict must be resolved as to each client. Moreover, there may be circumstances where it is impossible to make the disclosure necessary to obtain consent. For example, when the lawyer represents different clients in related matters and one of the clients refuses to consent to the disclosure necessary to permit the other client to make an informed decision, the lawyer cannot properly ask the latter to consent.
 The lawyer's own interests should not be permitted to have an adverse effect on representation of a client. For example, a lawyer's need for income should not lead the lawyer to undertake matters that cannot be handled competently and at a reasonable fee. See Rules 1.1 and 1.5. If the probity of a lawyer's own conduct in a transaction is in serious question, it may be difficult or impossible for the lawyer to give a client detached advice. A lawyer may not allow related business interests to affect representation, for example, by referring clients to an enterprise in which the lawyer has an undisclosed interest.
Conflicts in Litigation
 Paragraph (a) prohibits representation of opposing parties in litigation. Simultaneous representation of parties whose interests in litigation may conflict, such as coplaintiffs or codefendants, is governed by paragraph (b). An impermissible conflict may exist by reason of substantial discrepancy in the parties' testimony, incompatibility in positions in relation to an opposing party or the fact that there are substantially different possibilities of settlement of the claims or liabilities in question. Such conflicts can arise in criminal cases as well as civil. The potential for conflict of interest in representing multiple defendants in a criminal case is so grave that ordinarily a lawyer should decline to represent more than one codefendant. On the other hand, common representation of persons having similar interests is proper if the risk of adverse effect is minimal and the requirements of paragraph (b) are met. Compare Rule 2.2 involving intermediation between clients.
 Ordinarily, a lawyer may not act as advocate against a client the lawyer represents in some other matter, even if the other matter is wholly unrelated. However, there are circumstances in which a lawyer may act as advocate against a client. For example, a lawyer representing an enterprise with diverse operations may accept employment as an advocate against the enterprise in an unrelated matter if doing so will not adversely affect the lawyer's relationship with the enterprise or conduct of the suit and if both clients consent upon consultation. By the same token, government lawyers in some circumstances may represent government employees in proceedings in which a government agency is the opposing party. The propriety of concurrent representation can depend on the nature of the litigation. For example, a suit charging fraud entails conflict to a degree not involved in a suit for a declaratory judgment concerning statutory interpretation.
 A lawyer may represent parties having antagonistic positions on a legal question that has arisen in different cases, unless representation of either client would be adversely affected. Thus, it is ordinarily not improper to assert such positions in cases pending in different trial courts, but it may be improper to do so in cases pending at the same time in an appellate court.
Interest of Person Paying for a Lawyer's Service
 A lawyer may be paid from a source other than the client, if the client is informed of that fact and consents and the arrangement does not compromise the lawyer's duty of loyalty to the client. See Rule 1.8(f). For example, when an insurer and its insured have conflicting interests in a matter arising from a liability insurance agreement, and the insurer is required to provide special counsel for the insured, the arrangement should assure the special counsel's professional independence. So also, when a corporation and its directors or employees are involved in a controversy in which they have conflicting interests, the corporation may provide funds for separate legal representation of the directors or employees, if the clients consent after consultation and the arrangement ensures the lawyer's professional independence.
Other Conflict Situations
 Conflicts of interest in contexts other than litigation sometimes may be difficult to assess. Relevant factors in determining whether there is potential for adverse effect include the duration and intimacy of the lawyer's relationship with the client or clients involved, the functions being performed by the lawyer, the likelihood that actual conflict will arise and the likely prejudice to the client from the conflict if it does arise. The question is often one of proximity and degree.
 For example, a lawyer may not represent multiple parties to a negotiation whose interests are fundamentally antagonistic to each other, but common representation is permissible where the clients are generally aligned in interest even though there is some difference of interest among them.
 Conflict questions may also arise in estate planning and estate administration. A lawyer may be called upon to prepare wills for several family members, such as husband and wife, and, depending upon the circumstances, a conflict of interest may arise. In estate administration the identity of the client may be unclear under the law of a particular jurisdiction. Under one view, the client is the fiduciary; under another view the client is the estate or trust, including its beneficiaries. The lawyer should make clear the relationship to the parties involved.
 A lawyer for a corporation or other organization who is also a member of its board of directors should determine whether the responsibilities of the two roles may conflict. The lawyer may be called on to advise the corporation in matters involving actions of the directors. Consideration should be given to the frequency with which such situations may arise, the potential intensity of the conflict, the effect of the lawyer's resignation from the board and the possibility of the corporation's obtaining legal advice from another lawyer in such situations. If there is material risk that the dual role will compromise the lawyer's independence of professional judgment, the lawyer should not serve as a director.
Conflict Charged by an Opposing Party
 Resolving questions of conflict of interest is primarily the responsibility of the lawyer undertaking the representation. In litigation, a court may raise the question when there is reason to infer that the lawyer has neglected the responsibility. In a criminal case, inquiry by the court is generally required when a lawyer represents multiple defendants. Where the conflict is such as clearly to call in question the fair or efficient administration of justice, opposing counsel may properly raise the question. Such an objection should be viewed with caution, however, for it can be misused as a technique of harassment. See Scope.
Model Code Comparison
DR 5-101 (A) provided that "[e]xcept with the consent of his client after full disclosure, a lawyer shall not accept employment if the exercise of his professional judgment on behalf of the client will be or reasonably may be affected by his own financial business, property, or personal interests." DR 5-105(A) provided that a lawyer "shall decline proffered employment if the exercise of his independent professional judgment in behalf of a client will be or is likely to be adversely affected by the acceptance of the proffered employment, or if it would be likely to involve him in representing differing interests, except to the extent permitted under DR 5-105(C)." DR 5-105(C) provided that "a lawyer may represent multiple clients if it is obvious that he can adequately represent the interest of each and if each consents to the representation after full disclosure of the possible effects of such representation on the exercise of his independent professional judgment on behalf of each." DR 5-107(B) provided that a lawyer "shall not permit a person who recommends, employs, or pays him to render legal services for another to direct or regulate his professional judgment in rendering such services."
Rule 1.7 clarifies DR 5-105(A) by requiring that, when the lawyer's other interest are involved, not only must the client consent after consultation but also that, independent of such consent, the representation reasonably appears not to be adversely affected by the lawyer's other interests. This requirement appears to be the intended meaning of the provision in DR 5-105(C) that "it is obvious that he can adequately represent" the client, and was implicit in EC 5-2, which stated that a lawyer "should not accept proffered employment if his personal interests or desires will, or there is a reasonable probability that they will, affect adversely the advice to be given or services to be rendered the prospective client.