(a) Unless otherwise ordered by the hearing officer, no later than three days prior to the hearing each party shall submit to all other parties and to the hearing officer copies of all documentary evidence and the names of the witnesses each party intends to present in its case-in-chief at the hearing.

(b) In the administrative hearing, each party is entitled to present its case or defense by oral or documentary evidence, to submit rebuttal evidence, and to conduct such cross-examination as, in the discretion of the hearing officer, may be required for a full and true disclosure of the facts.