The document discusses the rules and exceptions regarding hearsay evidence in a court of law. Hearsay is defined as an out-of-court statement offered to prove the truth of the matter asserted, and is generally not admissible as evidence. However, there are several exceptions where hearsay may be allowed, including present sense impressions, excited utterances, statements of then-existing mental or physical condition, and statements against interest. The document also discusses the rules around hearsay within hearsay, attacking the credibility of a declarant, and the definition of unavailability of a declarant.