25 C.F.R. § 166.806
What actions does the BIA take against trespassers?
If the trespasser fails to take the corrective action specified by us, we may take one or more of the following actions, as appropriate:
(a) Seize, impound, sell or dispose of unauthorized livestock or other property involved in the trespass. We may keep such property we seize for use as evidence.
(b) Assess penalties, damages, and costs, under § 166.812 of this subpart.