19 U.S.C. § 1677d: Countervailable subsidy practices discovered during a proceeding

If, in the course of a proceeding under this subtitle, the administering authority discovers a practice which appears to be a countervailable subsidy, but was not included in the matters alleged in a countervailing duty petition, or if the administering authority receives notice from the Trade Representative that a subsidy or subsidy program is in violation of Article 8 of the Subsidies Agreement, then the administering authority—(1) shall include the practice, subsidy, or subsidy program in the proceeding if the practice, subsidy, or subsidy program appears to be a countervailable subsidy with respect to the merchandise which is the subject of the proceeding, or (2) shall transfer the information (other than confidential information) concerning the practice, subsidy, or subsidy program to the library maintained under section 1677f(a)(1) of this title, if the practice, subsidy, or subsidy program appears to be a countervailable subsidy with respect to any other merchandise.