25 CFR 63.16: Who conducts the background investigation and prepares the determination of suitability for employment?

(a) The Bureau of Indian Affairs must use the United States Office of Personnel Management (OPM) to conduct background investigations for Federal employees. The BIA must designate qualified security personnel to adjudicate the results of background investigations.

(b) Indian tribes and tribal organizations may conduct their own background investigations, contract with private firms, or request the OPM to conduct an investigation. The investigation should cover the past five years of the individual's employment, education, etc.