19 C.F.R. § 111.40 Protests.
Title 19 - Customs Duties
A broker must not act on behalf of any person, or attempt to represent any person, regarding any protest unless he is authorized to do so in accordance with part 174 of this chapter.
Title 19: Customs Duties
PART 111—CUSTOMS BROKERS
Subpart C—Duties and Responsibilities of Customs Brokers
§ 111.40 Protests.