Some of the Southwest reservervation boundaries are littered with booze bottles. Reckon tribal rules don't apply outside the reservation, unless there's involvement with non-tribal people in a motor vehicle accident outside those boundaries, unless things have changed since we lived near a reservation several years ago.
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.