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How is the BIA assured that the policies and standards are being applied uniformly and facilities are properly accredited? The tribes and BIA programs will use a phased approach to meeting all non-mandatory detention standards and will document progress on uniform reporting. The BIA Office of Law Enforcement Services will conduct periodic operational evaluations for oversight.The Bureau of Indian Affairs (BIA) is a federal agency within the Department of Interior. The BIA is responsible for the administration and management of 55.7 million acres of land held in trust by the United States for American Indians, Indian tribes, and Alaska Natives.