Section 228.18 - Cross-examination(a) The presiding officer may: (1) Require the cross-examiner to outline the intended scope of the cross-examination;(2) Prohibit parties from cross-examining witnesses unless the presiding officer has determined that the cross-examiner has an adverse interest on the facts at issue to the party-witness or the party presenting the witness. For the purposes of this subsection, the Assistant Administrator's or his or her representative's interest shall be considered adverse to all parties;(3) Limit the number of times any party or parties having a common interest may cross-examine an "adverse" witness on the same matter; and(4) Exclude cross-examination questions that are immaterial, irrelevant or unduly repetitious.(b) Any party shall be given an opportunity to appear, either in person or through an authorized counsel or representative, to cross-examine witnesses. Before cross-examining a witness, the party or counsel shall state his or her name, address and occupation. If counsel cross-examines the witness, counsel shall state for the record the authority to act as counsel. Cross-examiners shall be assumed to be familiar with the direct testimony.(c) Any party or party's counsel who fails to appear at the hearing to cross-examine an "adverse" witness shall be deemed to have waived the right to cross-examine that witness.(d) Scientific, technical or commercial publications may only be utilized for the limited purposes of impeaching witnesses under cross-examination unless previously submitted and introduced in accordance with these regulations.