Why dont you admit you either: 1. Hate the American Indian, or Native American, rather... 2. Are so stuck with the premise of taxing everyone and thing that moves, you cannot stand it if someone gets away with not paying taxes... or: 3. Actually ARE a Commie, ex-hippie drug infested loonie bird.
Do you use a passport when you leave the rez?
I will conclude that you do not use a passport when you leave the rez. Reason would follow that the tribes are not sovereign like other real countries that require a passport.