A driver's license isn't required on the reservation. Many of the "native americans" venture off the reservation without a driver's license, insurance or valid car registration. It's a chronic problem.
There is a rather unpleasant cultural behavior in our local tribes. They are given to spitting on the police officers when taken into custody. The local officers affix a "spit hood" on detainees to avoid the nasty behavior.
There's another group attempting to build the same kind of stronghold in America with Sharia law (instead of tribal). Once implemented, they'll undoubtedly have the same free reign as tribal leaders in our land. The integration of tribal law and American justice are rough (and even nonexistant) at best.