American Bar Association Model Rules of Professional Conduct - Rule 7.3. Direct Contact with Prospective Clients
(a) A lawyer shall not by in-person, live telephone or real-time electronic contact solicit professional employment from a prospective client when a significant motive for the lawyer's doing so is the lawyer's pecuniary gain, unless the person contacted:
(1) is a lawyer; or
(2) has a family, close personal, or prior professional relationship with the lawyer.
(b) A lawyer shall not solicit professional employment from a prospective client by written, recorded or electronic communication or by in-person, telephone or real-time electronic contact even when not otherwise prohibited by paragraph (a), if:
(1) the prospective client has made known to the lawyer a desire not to be solicited by the lawyer; or
(2) the solicitation involves coercion, duress or harassment.
(c) Every written, recorded or electronic communication from a lawyer soliciting professional employment from a prospective client known to be in need of legal services in a particular matter shall include the words "Advertising Material" on the outside envelope, if any, and at the beginning and ending of any recorded or electronic communication, unless the recipient of the communication is a person specified in paragraphs (a)(1) or (a)(2).
(d) Notwithstanding the prohibitions in paragraph (a), a lawyer may participate with a prepaid or group legal service plan operated by an organization not owned or directed by the lawyer that uses in-person or telephone contact to solicit memberships or subscriptions for the plan from persons who are not known to need legal services in a particular matter covered by the plan.