(a) Basic standard. All relevant evidence shall be admitted if it is the sort of evidence on which responsible persons are accustomed to rely in the conduct of serious affairs, regardless of the existence of any common law or statutory rule which might make improper the admission of such evidence over objection in civil action.
(b) Hearsay evidence. In a contested hearing, incompetent hearsay evidence may be used for the purpose of supplementing or explaining any other evidence but shall not be sufficient in itself to support a finding.
(c) Privilege. The rules of privilege shall be effective to the same extent as they are now or hereafter may be recognized in civil actions.
(d) Burden of proof. The burden of proof shall rest upon the party asserting the affirmative of an issue.
(e) Interferences and presumptions. Rules regarding interferences and presumptions in civil actions shall obtain.
(f) Rebuttal. Each party shall have the right to rebut evidence against him. (Rule 48, Ord. 555)