19 C.F.R. § 162.12 Service of search warrant.
Title 19 - Customs Duties
A search warrant shall be served in person by the officer to whom it is issued and addressed. In serving a search warrant, the officer shall leave a copy of the warrant with the person in charge or possession of the premises, or in the absence of any person, the copy shall be left in some conspicuous place on the premises searched.
Title 19: Customs Duties
PART 162—INSPECTION, SEARCH, AND SEIZURE
Subpart B—Search Warrants
§ 162.12 Service of search warrant.