Tribes have inherent authority to exercise criminal jurisdiction over tribal members
and to arrest and detain non-Indians for delivery to state or federal authorities for prosecution. These tribal police powers are generally limited to the reservation. Tribal police are often critical to resolving criminal cases referred to state and federal agencies because they usually discover the crime, interview witnesses, and understand the circumstances involved.
Commonly, tribal police department funding, administration, and employees are based on the Indian Self-Determination and Education Assistance Act of 1975, (Public Law 93-638 or P.L. 638). This law allows tribes to assume responsibility for many programs previously administered by the federal government, including law enforcement. P.L. 638 agencies operate with tribal employees under contract and with financial assistance from the Bureau of Indian Affairs (BIA).
Some tribally operated agencies have a self-governance compact with the BIA. This arrangement provides block grant payments, allowing for more tribal control than the line-item funding of P.L. 638 contracts. Full tribal control over law enforcement services exists where such services are entirely funded by the tribal government.
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