a Witness Rule 615. Excluding Witnesses Opinions and Expert Testimony Rule 701. Opinion Testimony by Lay Witnesses Rule 702. Testimony by Expert Witnesses Rule 703. Basses of an Expert's Opinion Testimony Rule 704. Opinion on an Ultimate Issue Rule 705. Disclosing the Facts or Data Underlying an Expert's Opinion Rule 706. Court–Appointed Expert Witnesses Hearsay Rule 801. Definitions that Apply to this Article; Exclusions from Hearsay Rule 802. The Rule Against Hearsay Rule 803. Exceptions to the Rule Against Hearsay–Regardless of Whether the Declarant is Available as a Witness Rule 804. Exceptions to the Rule Against Hearsay–when the Declarant is Unavailable as a Witness Rule 805. Hearsay Within Hearsay Rule 806. Attacking and Supporting the Declarant's Credibility Rule 807. Residual Exceptions Authentication and Identification Rule 901. Authenticating or Identifying Evidence Rule 902. Evidence that is Self–Authenticating Rule 903. Subscribing Witness's Testimony Contents of Writings, Recordings, and Photographs Rule 1001. Definitions that Apply to this Article. Rule 1002. Requirement of the Original Rule 1003. Admissibility of Duplicates Rule 1004. Admissibility of Other Evidence of Content Rule 1005. Copies of Public Records to Prove Content Rule 1006. Summaries to Prove Content Rule 1007. Testimony or Statement of a Party to Prove Content Rule 1008. Functions of the Court and Jury Miscellaneous Rules Rule 1101. Applicability of the Rules Rule 1102. Amendments Rule 1103. Title The Rules embody some very common concepts, and lawyers frequently refer to those concepts by the rule number. The most important conceptthe balancing of relevance against other competing interestsis embodied in Rule 403. One of the most common competing interests is the danger of prejudice. An example of otherwise relevant testimony being barred for the danger of unfair prejudice is as follows: A person is on trial for committing a crime. The defendant's alibi is that he was at a meeting of the Knights of the Ku Klux Klan during the time the crime was committed. The defendant has numerous witnesses who can place him at this meeting. The relevant part of this testimony is that the defendant was at a place other than the scene of the crime at the time the crime was committed. On cross examination it is generally relevant to delve into specifics about any alleged alibi such as who was there, what type of meeting it was etc. to ensure the defendant is being truthful. However the relevance of what type of meeting