Montana Senate Bill #114 (Proposed)
Here's a bit of the bill.
Section 2. County sheriff's permission for federal arrests, searches, and seizures -- exceptions. (1) A federal employee who is not designated by Montana law as a Montana peace officer may not make an arrest, search, or seizure in this state without the written permission of the sheriff or designee of the sheriff of the county in which the arrest, search, or seizure will occur unless:...
Section 3. Remedies. (1) An arrest, search, or seizure or attempted arrest, search, or seizure in violation of [section 2] is unlawful, and the persons involved must be prosecuted by the county attorney for kidnapping if an arrest or attempted arrest occurred, for trespass if a search or attempted search occurred, for theft if a seizure or attempted seizure occurred, and for any applicable homicide offense if loss of life occurred. The persons involved must also be charged with any other applicable criminal offense in Title 45.