Banishment is a traditional punishment and has been around a lot longer in Alaska than the "white man's" law.  If we take the sovereignty of the village/native people on native land seriously we should not interfere.  Frankly, there are a lot of Anchorage drug dealers I would like to see banished to Fire Island and allowed their freedom to continue selling there with no help from the mainland (no boat and no rescue from the mud flats either).