The General Imputation Rule

Imputed Conflicts Within a Firm

The General Imputation Rule

Rule 1.10(a) is the baseline for the rest of this chapter. While lawyers are associated in a firm, none of them may knowingly represent a client when any one of them, practicing alone, would be prohibited from doing so by Rule 1.7 or Rule 1.9.¹ The rule works in two moves. It first isolates one lawyer, imagines that lawyer with no colleagues, and asks whether the current-client rule or the former-client rule would forbid the representation. It then spreads the answer: a lawyer who would be barred alone brings every colleague under the same bar. The result is called vicarious, or imputed, disqualification: one lawyer's ethical disqualification becomes the disqualification of every lawyer in the firm.² The conflict stays with the firm whichever lawyer is assigned the file, because the duty of loyalty is owed to the client by the firm as a whole.³

Only Rules 1.7 and 1.9 feed this rule, and Rule 1.10(a) decides neither. Rule 1.7 supplies the current-client conflicts: a lawyer may not take a matter directly adverse to another client, or one that responsibilities to another client, a former client, or a third person would materially limit.⁴ Whether such a conflict exists can turn on context. As a general rule, courts are more tolerant of simultaneous representation in a small, closely held corporation than in a large, publicly held one.⁵ But imputation begins only after that threshold finding. Rule 1.9 supplies the former-client conflicts: once a representation has ended, the lawyer may not act adversely to the former client in the same or a substantially related matter.⁶ Rule 1.10(a) takes the answer from those two rules and extends it across the firm.

Other prohibitions travel by other routes. The Rule 1.8 prohibitions are imputed by Rule 1.8(k), which makes a prohibition that applies to any one associated lawyer apply to all of them.⁷ Conflicts of former government lawyers and of former judges and other neutrals sit under Rules 1.11 and 1.12.⁸ A prospective client's protection comes from Rule 1.18, which applies a similar but slightly diluted version of the former-client test.⁹

The opening words, while lawyers are associated in a firm, fix the moment of decision. Imputation lasts as long as the association does. The other paragraphs of Rule 1.10 handle the lawyer who leaves, waiver by the affected client, and the firms of former government lawyers; this section teaches the baseline in paragraph (a).¹⁰ The word knowingly confines the violation to a representation undertaken with knowledge, which is why conflict checks matter: a check is how a firm learns what its own lawyers' histories would impute.

Three ideas explain why the rule is built this way. The first is confidentiality. The law presumes that what one lawyer in a firm knows about a client, every lawyer there knows.¹¹ A former client therefore need not identify the confidences that were shared, or show that any was actually divulged; requiring that showing would undermine the very confidentiality the rule protects.¹² The second is loyalty. The firm, not the assigned lawyer, owes the duty, so a firm could not dissolve a conflict by handing the file to a colleague down the hall.¹³ The third is risk. Conflict rules aim at the risk that lawyers will compromise duties owed to clients, not at proven harm, which is why there is no such thing as a 'potential' conflict.¹⁴

The rule has a price, and the price explains the exceptions. When a firm takes in a lawyer who carries a disqualification, the taint reaches every lawyer in the firm, and the firm may have to withdraw from longstanding clients, a cost that falls on the firm and on the clients who have relied on it.¹⁵ For many decades screening was authorized only for former public officers and employees under Rule 1.11 and for former judges and other neutrals under Rule 1.12. In 2009 the American Bar Association amended Rule 1.10 so that an ethical screen can, in the particular context of the migrating lawyer, avoid firm-wide disqualification.¹⁶ The sections below treat those limits as exceptions carved out of this rule, not as replacements for it.

The two scenes differ on one point: whether the first lawyer, practicing alone, would be barred. Matters are substantially related when they involve the same transaction or legal dispute, or when there is otherwise a substantial risk that confidential factual information normally obtained in the earlier representation would materially advance the client's position in the new matter.¹⁷ The boundary dispute meets that test; the probate file does not. Imputation starts from a prohibition that already exists, so two lawyers who share a firm have not, by that fact alone, found a conflict to impute.

The baseline allows no workaround for lawyers who are already colleagues. Screening is confined to narrow settings: former government lawyers, former judges and neutrals, and the lawyer who migrates from another firm.¹⁸ A firm therefore cannot wall off a lawyer whose current client a colleague wants to sue and so avoid imputation. The exceptions in Rule 1.10(a), taught in the sections that follow, are narrow.