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.
[T.D. 73-27, 38 FR 2449, Jan. 26, 1973, as amended by CBP Dec. 09-37, 74 FR 48854, Sept. 25, 2009]