(2) Commission personnel shall present the case for the Commission. A Commission attorney may represent such personnel, so long as the Commission attorney or other Commission personnel:

1. (a) is responsible for an adequate investigation before reaching a decision as to eligibility or provision of services;
2. (b) must appear at the proceeding to justify the action or inaction of the Commission;
3. (c) is responsible for submitting at the proceeding complete information on which any decision at issue is based;
4. (d) must ensure that the case record is present at the proceeding;
5. (e) should introduce from the case record only the materialwhich pertains to the issue or issues;
6. (f) may examine and introduce any other pertinent Commission documents;
7. (g) may present and establish all relevant facts and circumstances by oral testimony and documentary evidence;
8. (h) may advance any pertinent arguments without any undue interference; and
9. (i) may question or refute any evidence or testimony and have an opportunity to confront and cross-examine adverse witnesses.