42 CFR §137.225

A Self-Governance Tribe may request a waiver of regulation(s) promulgated under section 517 of the Act [25 U.S.C. 458aaa-16] or under the authorities specified in section 505(b) of the Act [25 U.S.C. 458aaa-4(b)] for a compact or funding agreement entered into with the IHS under Title V.