(a)  In General.⁠—The Secretary may conduct investigations and inspections regarding compliance with this chapter and regulations prescribed under this chapter.

(b)  Authority To Obtain Evidence.⁠—

(1)  In general.⁠—For the purposes of any investigation conducted under this section, the Secretary may issue a subpoena to require the attendance of a witness or the production of documents or other evidence relevant to the matter under investigation if⁠—

(A)  before the issuance of the subpoena, the Secretary requests a determination by the Attorney General as to whether the subpoena⁠—

(i)  is reasonable; and

(ii)  will interfere with a criminal investigation; and

(B)  the Attorney General⁠—

(i)  determines that the subpoena is reasonable and will not interfere with a criminal investigation; or

(ii)  fails to make a determination with respect to the subpoena before the date that is 30 days after the date on which the Secretary makes a request under subparagraph (A) with respect to the subpoena.

(2)  Enforcement.⁠—In the case of a refusal to obey a subpoena issued to any person under this section, the Secretary may invoke the aid of the appropriate district court of the United States to compel compliance.