19 C.F.R. § 162.11 Authority to procure warrants.
Title 19 - Customs Duties
Customs officers are authorized to procure search warrants under the provisions of section 595, Tariff Act of 1930, as amended (19 U.S.C. 1595). However, a Customs officer who is lawfully on any premises and is able to identify merchandise which has been imported contrary to law may seize such merchandise without a warrant. If merchandise is in a building on the boundary, see §123.71 of this chapter.
Title 19: Customs Duties
PART 162—INSPECTION, SEARCH, AND SEIZURE
Subpart B—Search Warrants
§ 162.11 Authority to procure warrants.

