Pub. L. 108-199, div. G, tit. IV, sec. 405

Sec. 405. None of the funds provided in this Act may be used, directly or through grants, to pay or to provide reimbursement for payment of the salary of a consultant (whether retained by the Federal Government or a grantee) at more than the daily equivalent of the rate paid for level IV of the Executive Schedule, unless specifically authorized by law.