21 USC 3433 - Disclosure

(a) No provision of section 321 (n), 343 (a), or 348 of this title shall be construed to require on the label or labeling of a food a separate radiation disclosure statement that is more prominent than the declaration of ingredients required by section 343 (i)(2) of this title.
(b) In this section, the term radiation disclosure statement means a written statement that discloses that a food has been intentionally subject to radiation.