A party may appear in person or by counsel and participate fully in any proceeding. A State agency or a corporation may appear by any of its officers or by any employee it authorizes to appear on its behalf. Counsel must be members in good standing of the bar of a State, Territory, or possession of the United States or of the District of Columbia or the Commonwealth of Puerto Rico.

Any individual acting in a representative capacity in any proceeding may be required to show his authority to act in such capacity.

Disrespectful, disorderly, or contumacious language or contemptuous conduct, refusal to comply with directions, or continued use of dilatory tactics by any person at any hearing before a presiding officer shall constitute grounds for immediate exclusion of such person from the hearing by the presiding officer.