Substantial changes to Rule 45 of the Federal Rules of Civil Procedure took effect December 1 of this year. First, Rule 45(c)(1) has been revised to clarify that a party officer, like other witnesses, cannot be compelled by subpoena to travel more than 100 miles to testify at trial. Second, subpoenas to non-parties located outside the jurisdiction in which an action is pending “must be issued from the court where the action is pending,” rather than the jurisdiction in which compliance is to take place. Fed. R. Civ. P. 45(a)(2). Third, motions concerning subpoena-related disputes must be initially brought in the district court in the compliance location if compliance is not required in the district of the issuing court, Fed. R. Civ. P. 45(d), but the motion may be transferred to the issuing court "if the person subject to the subpoena consents or if the court finds exceptional circumstances." Fed. R. Civ. P. 45(f).
For more information on these revisions and to review additional changes to Rules 45 and 37, the text of the rules and committee notes are available here.