25 USC 2809 - Reports to tribes

(a) Reports by law enforcement officials of Bureau or Federal Bureau of Investigation 
In any case in which law enforcement officials of the Bureau or the Federal Bureau of Investigation decline to initiate an investigation of a reported violation of Federal law in Indian country, or terminate such an investigation without referral for prosecution, such officials are authorized to submit a report to the appropriate governmental and law enforcement officials of the Indian tribe involved that states, with particularity, the reason or reasons why the investigation was declined or terminated.
(b) Reports by United States attorney 
In any case in which a United States attorney declines to prosecute an alleged violation of Federal criminal law in Indian country referred for prosecution by the Federal Bureau of Investigation or the Bureau, or moves to terminate a prosecution of such an alleged violation, the United States attorney is authorized to submit a report to the appropriate governmental and law enforcement officials of the Indian tribe involved that states, with particularity, the reason or reasons why the prosecution was declined or terminated.
(c) Case file included within reports 
In any case
(1) in which the alleged offender is an Indian, and

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(2) for which a report is submitted under subsection (a) or (b) of this section,

the report made to the Indian tribe may include the case file, including evidence collected and statements taken, which might support an investigation or prosecution of a violation of tribal law.

(d) Transfer or disclosure of confidential or privileged communication, information or sources to tribal officials 
Nothing in this section shall require any Federal agency or official to transfer or disclose any confidential or privileged communication, information, or sources to the officials of any Indian tribe. Federal agencies authorized to make reports pursuant to this section shall, by regulations, adopt standards for the protection of such communications, information, or sources.