The period during which payments are made to a State from a grant under section 280c(a) of this title may not exceed 3 years. Such payments shall be subject to annual evaluation by the Secretary.
Non-Federal contributions required in subsection (b) may be in cash or in kind, fairly evaluated, including plant, equipment, or services. Amounts provided by the Federal Government, or services assisted or subsidized to any significant extent by the Federal Government, may not be included in determining the amount of such non-Federal contributions.