All testimony to be considered at a hearing, except matters officially noticed or entered by stipulation, shall be sworn or affirmed.
Refusal of a witness to answer any question ruled to be proper shall, in the discretion of the Board or Board Agent, be grounds for excusing the witness or striking any or all testimony given by the witness.
A party may not call the opposing partys representative as a witness, unless it shows that such testimony is necessary and will not be cumulative or repetitive. Notice of intention to call the opposing partys representative as a witness, together with a supporting affidavit, must be filed with the Board no later than 14 days before the hearing date.
Subsection (3) of this rule does not apply to a party appearing pro se.