45 C.F.R. § 801.308 Rights and duties of parties.
Title 45 - Public Welfare
(a) The challenger has the burden of proceeding and proof at the hearing and shall appear personally or with a representative to prosecute the challenge, except that when a continuance is sought the challenger may appear by a representative. If a challenger fails to appear personally to prosecute the challenge, the hearing officer shall issue a decision denying the challenge or make such other disposition as is warranted by the circumstances. (b) The challenged person has the right to appear at the hearing personally or by or with a representative, and to present witnesses and documentary evidence in his behalf.
Title 45: Public Welfare
PART 801—VOTING RIGHTS PROGRAM
Subpart C—Challenges to Listing on Eligibility List
§ 801.308 Rights and duties of parties.

