Under what circumstances may the Secretary conduct additional reviews and evaluations?

The Secretary may conduct additional reviews and evaluations: (a) At a Tribe's request; (b) As part of an investigation undertaken when the Tribe notifies the Secretary of a violation or breach; (c) As part of an investigation undertaken because of a petition submitted under subpart E of this part; (d) As follow-up to a determination that harm or the potential for harm to a physical trust asset, previously identified in a periodic review and evaluation, exists; or (e) As the Secretary determines appropriate to carry out the Secretary's trust responsibilities.