19 CFR 148.11 : Customs Duties (§ 0.1 To Parts 400-599) — (§ 141.0 To Parts 193-199) — U.S. Customs And Border Protection, Department Of Homeland Security; Department Of The Treasury (Continued) (§ 141.0 To Parts 193-199) — Personal Declarations And Exemptions (§ 148.0 To § 148.116) — Declarations (§ 148.11 To § 148.19) — Declaration required.

All articles brought into the United States by any individual must be declared to a CBP officer at the port of first arrival in the United States, on a conveyance en route to the United States on which a CBP officer is assigned for that purpose, or at a preclearance office in a foreign country where a United States CBP officer is stationed for that purpose.