25 CFR § 501.2 - Scope.
(a) Tribes and other operators of class II and class III gaming operations on Indian lands shall conduct gaming operations according to the requirements of the Indian Gaming Regulatory Act, the regulations of this chapter, tribal law and, where applicable, the requirements of a compact or procedures prescribed by the Secretary under 25 U.S.C. 2710(d).
(b) Class I gaming on Indian lands is within the exclusive jurisdiction of the Indian tribes and shall not be subject to the provisions of the Indian Gaming Regulatory Act or this chapter.
(c) Class II gaming on Indian lands shall continue to be within the jurisdiction of an Indian tribe, but shall be subject to the provisions of the Indian Gaming Regulatory Act and this chapter.
(d) Nothing in the Indian Gaming Regulatory Act or this chapter shall impair the right of an Indian tribe to regulate class III gaming on its Indian lands concurrently with a State, except to the extent that such regulation is inconsistent with, or less stringent than, the State laws and regulations made applicable by a Tribal-State compact that is entered into by an Indian tribe under the Indian Gaming Regulatory Act and that is in effect.