Except as provided in section
1413 of this title, funds paid to a State under this subchapter will be used to supplement the level of Federal, State, and local funds (including funds that are not under the direct control of State or local educational agencies) expended for special education and related services provided to children with disabilities under this subchapter and in no case to supplant such Federal, State, and local funds, except that, where the State provides clear and convincing evidence that all children with disabilities have available to them a free appropriate public education, the Secretary may waive, in whole or in part, the requirements of this subparagraph if the Secretary concurs with the evidence provided by the State.