43 U.S.C. § 102 : US Code - Section 102: Attendance of witnesses

Search 43 U.S.C. § 102 : US Code - Section 102: Attendance of witnesses

Officers of district land offices designated by the Secretary of
the Interior in all matters requiring a hearing before them are
authorized and empowered to issue subpoenas directing the
attendance of witnesses, which subpoenas may be served by any
person by delivering a true copy thereof to such witness, and when
served, witnesses shall be required to attend in obedience thereto:
Provided, That if any subpoena be served under the provisions of
this section by any person other than an officer authorized by the
laws of the United States, or of the State or Territory in which
the depositions are taken, the service thereof shall be proved by
the affidavit of the person serving the same: Provided further,
That said subpoenas shall be served within the county in which
attendance is required, and at least five days before attendance is
required.