(a) Section 3702 shall not apply to—

(1) a lottery, sweepstakes, or other betting, gambling, or wagering scheme in operation in a State or other governmental entity, to the extent that the scheme was conducted by that State or other governmental entity at any time during the period beginning January 1, 1976, and ending August 31, 1990;

(2) a lottery, sweepstakes, or other betting, gambling, or wagering scheme in operation in a State or other governmental entity where both—

(A) such scheme was authorized by a statute as in effect on October 2, 1991; and

(B) a scheme described in section 3702 (other than one based on parimutuel animal racing or jai-alai games) actually was conducted in that State or other governmental entity at any time during the period beginning September 1, 1989, and ending October 2, 1991, pursuant to the law of that State or other governmental entity;

(3) a betting, gambling, or wagering scheme, other than a lottery described in paragraph (1), conducted exclusively in casinos located in a municipality, but only to the extent that—

(A) such scheme or a similar scheme was authorized, not later than one year after the effective date of this chapter, to be operated in that municipality; and

(B) any commercial casino gaming scheme was in operation in such municipality throughout the 10-year period ending on such effective date pursuant to a comprehensive system of State regulation authorized by that State's constitution and applicable solely to such municipality; or

(4) parimutuel animal racing or jai-alai games.

(b) Except as provided in subsection (a), section 3702 shall apply on lands described in section 4(4) of the Indian Gaming Regulatory Act (25 U.S.C. 2703(4)).