Policy Memorandum: The Role of Private Attorneys and Other Representatives; Revisions to Adjudicator's Field Manual (AFM) Chapters 12 and 15; AFM Update AD11-42 [open pdf - 357KB]
"This policy memorandum (PM) provides guidance regarding the role of private attorneys and other representatives who appear before USCIS. […] U.S. Citizenship and Immigration Services (USCIS) is committed to ensuring the integrity of the immigration system. This goal is furthered when USCIS adjudicators recognize the range of individuals who may represent applicants and petitioners, respect the relationship between client and representative, and conduct interviews professionally. The Department of Homeland Security has rules of professional conduct for employees and practitioners who practice before the Department. This policy memorandum provides guidance to adjudicators and balances the meaningful role of attorneys and representatives in the interview process with the important responsibility of adjudicators to conduct fair, orderly interviews."
Policy Memorandum: PM-602-0055
U.S. Citizenship and Immigration Services: http://www.uscis.gov/