A grant made under this subchapter may not be expended for more than 75 percent of the cost of the identified uses, in the aggregate, for which such grant is received to carry out section
3796aa–1 of this title, except that in the case of funds distributed to an Indian tribe which performs law enforcement functions (as determined by the Secretary of the Interior) for any such program or project, the amount of such grant shall be equal to 100 percent of such cost. The non-Federal portion of the expenditures for such uses shall be paid in cash.