The presiding officer who presides at the hearing shall have all powers necessary to the conduct of a fair and impartial hearing including, but not limited to, the power to:
* Refusing to allow the disobedient party to support or oppose designated claims or defenses, or prohibiting the party from introducing designated matters in evidence;
* Excluding all testimony of an unresponsive or evasive witness, or determining that the answer of such witness, if given, would be unfavorable to the party, if any, having control over the witness; and
* Expelling any party or person from further participation in the hearing.
Iowa Admin. Code r. 161-4.15