I-9, r. 6 - Code of ethics of engineers
5.01.04. An engineer shall not in his representation or advertising:
(1) invade a person’s privacy;
(2) undermine a person’s reputation;
(3) compare the quality of his services with that of the services offered or rendered by other engineers;
(4) discredit, denigrate or disparage the services offered or rendered by other engineers.