Colorado Gazette article on the case here.
Write up by MSU on the case here
When the Logan County, Colorado Department of Human Services removed two infant twin girls from the custody of their mother, the mother told the department that their father might have Chickasaw heritage. The department sent notice to the Chickasaw Nation, which responded that the children were eligible for citizenship and sent the necessary tribal citizenship forms to the department.
The Chickasaw Nation never got those forms back.
To all appearances, the agency simply ignored the notice from the Chickasaw Nation, and the Nation received no communication from the State. The State filed to terminate the mother’s parental rights and only at that point did Logan County disclose to the juvenile court that the children were eligible for enrollment in the Chickasaw Nation.