This document contains the Federal Rules of Evidence, as amended to December 1, 2011. The rules were enacted by Public Law 93-595 (approved January 2, 1975) and have been amended by Acts of Congress, and further amended by the United States Supreme Court. This document has been prepared by the Committee in response to the need for an official up-to-date document containing the latest amendments to the rules. For the convenience of the user, where a rule has been amended a reference to the date the amendment was promulgated and the date the amendment became effective follows the text of the rule. The Committee on Rules of Practice and Procedure and the Advisory Committee on the Federal Rules of Evidence, Judicial Conference of the United States, prepared notes explaining the purpose and intent of the amendments to the rules. The Committee Notes may be found in the Appendix to Title 28, United States Code, following the particular rule to which they relate.