29 C.F.R. § 38.3
(c) This part does not invalidate or limit the obligations, remedies, rights, and procedures under any Federal law, or the law of any State or political subdivision, that provides greater or equal protection for the rights of persons as compared to this part:
(d) Compliance with this part does not affect, in any way, any additional obligations that a recipient may have to comply with applicable federal laws and their implementing regulations, such as the following: