20 C.F.R. § 618.220 – Use of subpoena.

(a) The Administrator may require, by subpoena, in connection with any investigation or hearing, the attendance and testimony of witnesses and the production of evidence the issuing official deems necessary to make a determination under this subpart.
(b) The Department will issue a subpoena to secure evidence from a firm, customer, petitioner, or other person who fails to provide requested information within 20 days of the request, unless the recipient of the subpoena demonstrates to the satisfaction of the Department that the information will be provided within a reasonable time. In making this determination, the Department will consider the following factors:
1. (1) Submission of a portion of the required information;
2. (2) Prompt cooperation with inquiries about the information;
3. (3) Cooperation in previous responses to information requests;
4. (4) Evidence of effort to obtain the required information; and
5. (5) Other information the Department determines to be relevant.
(c) Witnesses subpoenaed under this section to appear in person must be paid the same fees and mileage as are paid for like services in the District Court of the United States within the jurisdiction of which the proceeding is taking place. The Department must pay the witness fees and mileage.
(d) Subpoenas issued under paragraph (a) of this section must be signed by the Administrator, or his or her designee, and must be served consistent with Rule 5(b) of the Federal Rules of Civil Procedure. The date for compliance must be 7 calendar days following service of the subpoena, unless otherwise indicated.
(e) If the recipient of the subpoena refuses to provide the requested information, the Department may petition the appropriate District Court of the United States to seek enforcement of the subpoena.