(a) All products, after entry into the United States, shall be deemed and treated as domestic products and shall be subject to the applicable provisions of the Act and the regulations in this subchapter and the applicable requirements under the Federal Food, Drug and Cosmetic Act, except that products imported under § 327.16 are required to comply only with the requirements of that Act and § 327.16 of this subchapter.

(b) Products entered in accordance with this part may, subject to the provisions of part 318 of this subchapter, be taken into official establishments and be mixed with or added to any product in such establishments which has been inspected and passed therein.

(c) Imported product which has been inspected, passed, and marked under this part may be transported in the course of importation or subsequently in commerce only upon compliance with part 325 of this subchapter.