FAA Federal Aviation Regulations (FARS, 14 CFR)

(a) General. A party is entitled to present the party's case or defense by oral, documentary, or demonstrative evidence, to submit rebuttal evidence, and to conduct any cross-examination that may be required for a full and true disclosure of the facts.

(b) Admissibility. A party may introduce any oral, documentary, or demonstrative evidence in support of the party's case or defense. The administrative law judge shall admit any oral, documentary, or demonstrative evidence introduced by a party but shall exclude irrelevant, immaterial, or unduly repetitious evidence.

(c) Hearsay evidence. Hearsay evidence is admissible in proceedings governed by this subpart. The fact that evidence submitted by a party is hearsay goes only to the weight of the evidence and does not affect its admissibility.