Ill. Sup. Ct. R. 7.1
A lawyer shall not make a false or misleading communication about the lawyer or the lawyer's services. A communication is false or misleading if it contains a material misrepresentation of fact or law, or omits a fact necessary to make the statement considered as a whole not materially misleading.
Ill. Sup. Ct. R. 7.1
Comment
[1] This Rule governs all communications about a lawyer's services, including advertising permitted by Rule 7.2. Whatever means are used to make known a lawyer's services, statements about them must be truthful.
[2] Truthful statements that are misleading are also prohibited by this Rule. A truthful statement is misleading if it omits a fact necessary to make the lawyer's communication considered as a whole not materially misleading. A truthful statement is also misleading if there is a substantial likelihood that it will lead a reasonable person to formulate a specific conclusion about the lawyer or the lawyer's services for which there is no reasonable factual foundation.
[3] An advertisement that truthfully reports a lawyer's achievements on behalf of clients or former clients may be misleading if presented so as to lead a reasonable person to form an unjustified expectation that the same results could be obtained for other clients in similar matters without reference to the specific factual and legal circumstances of each client's case. Similarly, an unsubstantiated comparison of the lawyer's services or fees with the services or fees of other lawyers may be misleading if presented with such specificity as would lead a reasonable person to conclude that the comparison can be substantiated. The inclusion of an appropriate disclaimer or qualifying language may preclude a finding that a statement is likely to create unjustified expectations or otherwise mislead the public.
[4] See also Rule 8.4(e) for the prohibition against stating or implying an ability to influence improperly a government agency or official or to achieve results by means that violate the Rules of Professional Conduct or other law.