Title XXI of the Homeland Security Act of 2002 ( 6 U.S.C. 621 et seq.) is amended by striking section 2109 ( 6 U.S.C. 629 ) and inserting the following: 2109. Explosive materials (a) In general The Secretary may not designate any explosive material regulated by the Department of Justice under chapter 40 of title 18, United States Code, or by the Bureau of Alcohol, Tobacco, Firearms, and Explosives under part 555 of title 27, Code of Federal Regulations, as a chemical of interest under Appendix A to part 27 of title 6, Code of Federal Regulations, or any successor thereto. (b) Explosive material regulated after designation If any explosive material that is designated as a chemical of interest under Appendix A to part 27 of title 6, Code of Federal Regulations, or any successor thereto, becomes regulated by the Department of Justice under chapter 40 of title 18, United States Code, or by the Bureau of Alcohol, Tobacco, Firearms, and Explosives under part 555 of title 27, Code of Federal Regulations, or any successor thereto, the Secretary shall remove the designation of such explosive material as a chemical of interest. . (3) Technical and conforming amendment The table of contents in section 1(b) of the Homeland Security Act of 2002 ( Public Law 107–196