45 CFR 702.4 - Subpoenas.
(a) Subpoenas for the attendance and testimony of witnesses or the production of written or other matter may be issued by the Commission over the signature of the Chairperson and may be served by any person designated by the Chairperson.
(b) A witness compelled to appear before the Commission or required to produce written or other matter shall be served with a copy of the rules in this part at the time of service of the subpoena.
(c) The Commission may issue subpoenas for the attendance and testimony of witnesses or for the production of written or other matter. Such a subpoena may not require the presence of a witness more than 100 miles outside the location wherein the witness is found or resides or is domiciled or transacts business or has appointed an agent for receipt of service of process.
(d) The Chairperson shall receive and the Commission shall dispose of requests to subpoena additional witnesses except as otherwise provided in § 702.6(e).
(e) Requests for subpoenas shall be in writing, supported by a showing of the general relevance and materiality of the evidence sought. Witness fees and mileage shall be computed and paid pursuant to § 702.15.
(f) Subpoenas shall be issued at a reasonably sufficient time in advance of their scheduled return, in order to give subpoenaed persons an opportunity to prepare for their appearance and to employ counsel, should they so desire.
(g) No subpoenaed document or information contained therein shall be made public unless it is introduced into and received as part of the official record of the hearing.