The procedures in this part apply when—

(a) A person has a right to an opportunity for a hearing under sections 2(q)(1)(B) or 3(a) of the Federal Hazardous Substances Act (“FHSA”) and 701(e) of the Federal Food, Drug, and Cosmetic Act (“FDCA”) (15 U.S.C. 1261(q)(1)(B) and 1262(a), and 21 U.S.C. 371(e));

(b) The Commission elects to hold a hearing under section 3(e)(1) of the FHSA or section 5 of the Poison Prevention Packaging Act (“PPPA”) and section 701(e) of the FDCA (15 U.S.C. 1262(e)(1) and 1474(a), and 21 U.S.C. 371(e)); or

(c) The Commission concludes that it is in the public interest to hold a formal evidentiary public hearing on any matter before it in such a proceeding.