21 U.S.C. § 678 : US Code - Section 678: Non-Federal jurisdiction of federally regulated matters; prohibition of additional or different requirements for establishments with inspection services and as to marking, labeling, packaging, and ingredients; recordkeeping and related requirements; concurrent jurisdiction over distribution for human food purposes of adulterated or misbranded and imported articles; other matters

Search 21 U.S.C. § 678 : US Code - Section 678: Non-Federal jurisdiction of federally regulated matters; prohibition of additional or different requirements for establishments with inspection services and as to marking, labeling, packaging, and ingredients; recordkeeping and related requirements; concurrent jurisdiction over distribution for human food purposes of adulterated or misbranded and imported articles; other matters

Requirements within the scope of this chapter with respect to
premises, facilities and operations of any establishment at which
inspection is provided under subchapter I of this chapter, which
are in addition to, or different than those made under this chapter
may not be imposed by any State or Territory or the District of
Columbia, except that any such jurisdiction may impose
recordkeeping and other requirements within the scope of section
642 of this title, if consistent therewith, with respect to any
such establishment. Marking, labeling, packaging, or ingredient
requirements in addition to, or different than, those made under
this chapter may not be imposed by any State or Territory or the
District of Columbia with respect to articles prepared at any
establishment under inspection in accordance with the requirements
under subchapter I of this chapter, but any State or Territory or
the District of Columbia may, consistent with the requirements
under this chapter, exercise concurrent jurisdiction with the
Secretary over articles required to be inspected under said
subchapter I, for the purpose of preventing the distribution for
human food purposes of any such articles which are adulterated or
misbranded and are outside of such an establishment, or, in the
case of imported articles which are not at such an establishment,
after their entry into the United States. This chapter shall not
preclude any State or Territory or the District of Columbia from
making requirement (!1) or taking other action, consistent with
this chapter, with respect to any other matters regulated under
this chapter.