Amendments to the Federal Rules of Procedure and Evidence become effective three years from initial drafting by an advisory committee. Proposed amendments are considered by the respective advisory committees, then circulated for public comment, and then forwarded to the Judicial Conference’s Standing Committee on Rules. If approved by the Judicial Conference, they are sent to the Supreme Court for any appropriate changes. If Congress makes no changes after approval by the Supreme Court, the amendments automatically become effective December 1. Two proposed amendments in 2010 did not become effective because they were not submitted to Congress under the procedure outlined above. The remaining amendments proposed in 2008, went into effect December 1, 2010.
David A. Schlueter, Federal Rules Update: Rules Amended as of December 2010, 26 Crim. Just. 65 (2011).