If you can find out what the Coeur d'Alene tribe says about ocing on the Reservation, that would be very helpful for all OCDO members.
Carry on Reservations is up to the Tribe and its Ordinances/laws. They fall outside the state laws on carrying firearms. Even a permit/license issued by the state is not valid on Reservations unless the Tribe OK’s it. It is very difficult to find out what their Ordinances/laws are on carrying firearms. Check with the Reservation Police/Government before carrying a firearm onto a Reservation.
"Non-Indians are not subject to the jurisdiction of Indian courts and cannot be tried in Indian courts on trespass [435 U.S. 191, 206] charges. Further, there are no Federal laws which can be invoked against trespassers.
...but a non-Indian trespasser on an Indian reservation enjoys immunity. This is by reason of the fact that Indian tribal law is enforcible against Indians only; not against non-Indians.