A licensee may not make statements or reports or give expert testimony on landscape architectural matters connected with public policy if the remarks are inspired or paid for by an interested party, unless the remarks are preceded by: Identification; Disclosing the identity of the party on whose behalf the remarks are being offered; and Revealing the existence of any pecuniary interest in the matter. A licensee may express publicly a professional opinion on a landscape architectural subject only when that opinion is founded upon adequate knowledge of the material facts and a background of technical competence in the subject matter. In any professional report, statement, or testimony, a licensee may not be untruthful, deceptive, or misleading. A licensee may not affix a professional seal other than the licensee's own seal to a professional document.