Here is the opinion in Citizens Against Casino Gambling in Erie County v. Chaudhuri:

CACGEC Opinion

The court’s syllabus:

The plaintiffs, organizations and individuals who oppose the operation of a casino on land owned by the Seneca Nation of Indians in Buffalo, New York, filed an action in the United States District Court for the Western District of New York against the National Indian Gaming Commission, its Chairman, the Department of the Interior, and the Secretary of the Interior, arguing that the National Indian Gaming Commission acted arbitrarily and capriciously and abused its discretion in approving an ordinance that permitted the Seneca Nation to operate a class III gaming facility in Buffalo. The district court (Skretny, J.) dismissed the action, and the plaintiffs appealed. We hold that the Seneca Nation’s lands in Buffalo are gaming‐eligible under the Indian Gaming Regulatory Act (“IGRA”), 25 U.S.C. §§ 2701–2721, as “Indian lands” under the Seneca Nation’s jurisdiction and that IGRA Section 20’s prohibition of gaming on trust lands acquired after IGRA’s enactment, 25 U.S.C. § 2719(a), does not apply. Accordingly, we AFFIRM.

Briefs here.

Lower court materials here.