19 CFR §162.12
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.