Here is the opinion in Cossey v. Cherokee Nation Enterprises from the Oklahoma Supreme Court, with several concurrences and dissents. And here are the briefs:
Oklahoma Supreme Court Allows Tort Claims against Cherokee Nation in State Court under Gaming Compact
Filed under Author: Matthew L.M. Fletcher, gaming, Research, sovereign immunity
American Indian Tribal Law
Facing the Future: The Indian Child Welfare Act at 30
The Eagle Returns: The Legal History of the Grand Traverse Band of Ottawa and Chippewa Indians
The Indian Civil Rights Act at Forty
A very weak majority opinion. Look for a Federal Court order enjoining it.
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