6 U.S.C. § 392

The Secretary— (1) may procure the temporary or intermittent services of experts or consultants (or organizations thereof) in accordance with section 3109 of title 5 ; and (2) may, whenever necessary due to an urgent homeland security need, procure temporary (not to exceed 1 year) or intermittent personal services, including the services of experts or consultants (or organizations thereof), without regard to the pay limitations of such section 3109.