(a) General. Except as otherwise provided by this part or the Presiding Officer, a hearing shall be conducted in accordance with the Federal Rules of Evidence. The Presiding Officer shall have the discretion to admit all evidence that is not irrelevant, immaterial, unduly repetitious, or otherwise unreliable or of little probative value, if he believes the evidence might facilitate the fair and expeditious resolution of the proceeding. But such evidence may be reasonably limited by the Presiding Officer in scope and length in order to permit prompt resolution of the proceeding. In the presentation, admission, disposition, and use of evidence, the Presiding Officer shall preserve the confidentiality of trade secrets and other commercial and financial information, and shall protect classified and unclassified controlled nuclear information, as well as any other information protected from public disclosure pursuant to law or regulation. The confidential, trade secret, or classified or otherwise protected status of any information shall not, however, preclude its being introduced into evidence. The Presiding Officer may make such orders as may be necessary to consider such evidence in camera, including the preparation of a supplemental initial decision to address questions of law, fact, or discretion that arise out of that portion of the evidence that is confidential, includes trade secrets, is classified, or is otherwise protected.

(b) Subpoenas. The attendance of witnesses or the production of documentary evidence may be required by subpoena.

(c) Examination of witnesses. There shall be no direct oral testimony by witnesses, except as permitted by the Presiding Officer. In lieu of oral testimony, the Presiding Officer shall admit into the record as evidence verified written statements of fact or opinion prepared by a witness. The admissibility of the evidence contained in the statement shall be subject to the same rules as if the testimony were produced under oral examination. Before any such statement is read or admitted into evidence, the witness shall have delivered a copy of the statement to the Presiding Officer and the opposing counsel not less than 10 days prior to the date the witness is scheduled to testify. The witness presenting the statement shall swear or affirm that the statement is true and accurate to the best of his knowledge, information, and belief and shall be subject to appropriate oral cross-examination upon the contents thereof provided such cross-examination is not unduly repetitious.

(d) Burden of presentation; burden of persuasion. The Director has the burden of going forward with and of proving that the violation occurred as set forth in the Notice of Violation and that the proposed civil penalty is appropriate. Following the establishment of a prima facie case, respondent shall have the burden of presenting and of going forward with any defense to the allegations set forth in the Notice of Violation. Each matter of controversy shall be determined by the Presiding Officer upon a preponderance of the evidence.