29 C.F.R. § 1992.102
(b) A whistleblower is protected against retaliation (as described in paragraph (a) of this section) by an employer for any lawful act done by the whistleblower:
(1) In providing information relating to a violation of 31 U.S.C. chapter 53, subchapter II (Records and Reports on Monetary Instruments Transactions, 31 U.S.C. 5311-5336); chapter 35 or section 4305 or 4312 of title 50; or the Foreign Narcotics Kingpin Designation Act, 21 U.S.C. 1901 et seq., or a conspiracy to violate the aforementioned provisions to:
(3) In providing information regarding any conduct that the whistleblower reasonably believes constitutes a violation of any law, rule, or regulation subject to the jurisdiction of the Department of the Treasury, or a violation of section 1956, 1957, or 1960 of title 18 (or any rule or regulation under any such provision) to: