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In creating the TANF block grant , Congress emphasized the importance of state flexibility , and to that end , the legislation restricted HHS regulatory authority over the states except to the extent expressly provided in the law . ( a ) Because the functions and duties of the department are largely technical in nature and require specialized knowledge , training , and experience for proper performance , the employees of the department designated by the state personnel department as professional or technical shall , except as otherwise expressly provided in this article , be employed solely on the basis of the qualifications of the employees to perform the required duties . This subpart does not apply to other arbitration proceedings specified by 17 U.S.C ., or to actions or rulemakings of the Librarian of Congress or the Register of Copyrights , except where expressly provided in the provisions of this subpart . 617 ] No officer or employee of the Federal Government may regulate the conduct of States under this part or enforce any provision of this part , except to the extent expressly provided in this part .