A short history lesson might be useful for readers from other countries. Valencia County is about in the middle of New Mexico, just south of Albuquerque. The Isleta Indian
Reservation sprawls across the northern part of the county. It is one of 25 such reservations in the state.. These reservations are, in essence, sovereign nations, established by treaties between the U.S. government and various Native American (aka "indian") tribes. They have their own governments and laws but generally work in close concert with county, state and federal governments. Non-indians can normally travel freely through the reservation and pueblos. They need only to obey reservation laws and normal social conventions.