internal revenue officer
(2) Administration and enforcement of certain provisions by Attorney General (A) In general The administration and enforcement of the following provisions of this title shall be performed by or under the supervision of the Attorney General; and the term “Secretary” or “Secretary of the Treasury” shall, when applied to those provisions, mean the Attorney General; and the term “internal revenue officer” shall, when applied to those provisions, mean any officer of the Bureau of Alcohol, Tobacco, Firearms, and Explosives so designated by the Attorney General: (i) Chapter 53. (ii) Chapters 61 through 80, to the extent such chapters relate to the enforcement and administration of the provisions referred to in clause (i). (B) Use of existing rulings and interpretations Nothing in the Homeland Security Act of 2002 alters or repeals the rulings and interpretations of the Bureau of Alcohol, Tobacco, and Firearms in effect on the effective date of such Act, which concern the provisions of this title referred to in subparagraph (A). The Attorney General shall consult with the Secretary to achieve uniformity and consistency in administering provisions under chapter 53 of title 26, United States Code .
26 USC § 7801(a)(2)
None identified, default scope is assumed to be the parent (subchapter A) of this section.