(a) A person who consults with a lawyer about the possibility of forming a client-lawyer relationship with respect to a matter is a prospective client.
(b) Even when no lawyer-client relationship ensues, a lawyer who learned information from a prospective client shall not use or reveal that information, except as Rule 1.9 would permit with respect to information of a former client.
(c) A lawyer subject to paragraph (b) shall not represent a client with interests materially adverse to those of a prospective client in the same or a substantially related matter if the lawyer received information from the prospective client that could be significantly harmful to that person in the matter, except as provided in paragraph (d). If a lawyer is disqualified from representation under this paragraph, no lawyer in a firm with which that lawyer is associated may knowingly undertake or continue representation in such a matter, except as provided in paragraph (d).
(d) When the lawyer has received significantly harmful information, representation is permissible if:
(1) both the affected client and the prospective client have given consent; or
(2) the lawyer who received the information took reasonable measures to avoid exposure to more significantly harmful information than was reasonably necessary to determine whether to represent the prospective client and notice is promptly given to the prospective client.
Definition of Prospective Client
 Prospective clients, like clients, may disclose information to a lawyer, place documents or other property in the lawyer's custody, or rely on the lawyer's advice. A lawyer's consultations with a prospective client usually are limited in time and depth and leave both the prospective client and the lawyer free (and sometimes required) to proceed no further. Hence, prospective clients should receive some but not all of the protection afforded clients.
 A person becomes a prospective client by consulting with a lawyer about the possibility of forming a client-lawyer relationship with respect to a matter. Whether communications, including written, oral, or electronic communications, constitute a consultation depends on the circumstances. For example, a consultation is likely to have occurred if a lawyer, either in person or through the lawyer's advertising in any medium, specifically requests or invites the submission of information about a prospective representation without clear and reasonably understandable warnings and cautionary statements that limit the lawyer's obligations, and a person provides information in response. See also Comment . In contrast, a consultation does not occur if a person provides information to a lawyer in response to advertising that merely describes the lawyer's education, experience, areas of practice, and contact information, or provides legal information of general interest. Such a person communicates information unilaterally to a lawyer, without any reasonable expectation that the lawyer is willing to discuss the possibility of forming a client-lawyer relationship, and is thus not a "prospective client". Moreover, a person who communicates with a lawyer for the purpose of disqualifying the lawyer is not a "prospective client".
 It is often necessary for a prospective client to reveal information to the lawyer during an initial consultation prior to the decision about formation of a client-lawyer relationship. The lawyer often must learn such information to determine whether there is a conflict of interest with an existing client and whether the matter is one that the lawyer is willing to undertake. Paragraph (b) prohibits the lawyer from using or revealing information, except as permitted by Rule 1.9, even if the client or lawyer decides not to proceed with the representation. The duty exists regardless of how brief the initial conference may be. A lawyer is not prohibited from revealing to an existing client that an opposing party has contacted the lawyer seeking representation.
 In order to avoid acquiring significantly harmful information from a prospective client, a lawyer considering whether or not to undertake a new matter should limit the initial consultation to only such information as reasonably appears necessary for that purpose. Where the information indicates that a conflict of interest or other reason for non-representation exists, the lawyer should so inform the prospective client or decline the representation. If the prospective client wishes to retain the lawyer, and if consent is allowed under Rule 1.7(c), then consent from all affected present or former clients must be obtained before accepting the representation.
 A lawyer may condition a consultation with a prospective client on the person's consent that no information disclosed during the consultation will prohibit the lawyer from representing a different client in the matter. If the agreement expressly so provides, the prospective client may also consent to the lawyer's subsequent use of information received from the prospective client.
 Even in the absence of an agreement, under paragraph (c), the lawyer is not prohibited from representing a client with interests adverse to those of the prospective client in the same or a substantially related matter unless the lawyer has received from the prospective client information that could be significantly harmful if used in the matter.
 Under paragraph (c), the prohibition in this Rule is imputed to other lawyers as provided in Rule 1.10, but, under paragraph (d)(1), imputation may be avoided if the lawyer obtains consent from both the prospective and affected clients. Obtaining the client's consent in writing is the preferred practice. Lack of a writing may make it difficult to prove client consent if a dispute arises later. In the alternative, imputation may be avoided if the conditions of paragraph (d)(2) are met and notice is promptly given to the prospective client.
 Notice, including a general description of the subject matter about which the lawyer was consulted generally should be given as soon as practical.
 For the duty of competence of a lawyer who gives assistance on the merits of a matter to a prospective client, see Rule 1.1. For a lawyer's duties when a prospective client entrusts valuables or papers to the lawyer's care, see Rule 1.15.
Rule 1.18 amended effective 03/01/97, 08/01/06, 03/01/16.
Reference: Minutes of the Professional Conduct Subcommittee of the Attorney Standards Committee on 11/08/85, 01/31/86 and 03/15/86; Minutes of the Joint Committee on Attorney Standards Meetings of 09/15/95, 12/01/95, 06/11/96; 02/27/04; 04/16/04, 03/18/05, 06/14/05, 09/09/05, 06/10/2014, 09/12/14, 02/26/16.