28 CFR 33.21: Match.

(a) Funds may be used to pay up to 50 percent of the cost of a program or project. Section 403(b)(1) of the Act. The remaining non-Federal share shall be in cash. Section 403(b)(2) of the Act. Match will be provided on a project by project basis. However, states may request the Bureau to approve exceptions such as match on a program by program basis, state-wide basis, unit-of-government basis, or a combination of the above. States must include any requests for approval of other than project-by-project match in their applications to the Bureau.

(b) Funds subgranted to an Indian tribe which performs law enforcement functions (as determined by the Secretary of the Interior) shall be used to pay 100 percent of the cost of a program or project. Section 403(b)(1) of the Act.