According to this excerpt from the Supreme Court case United States v.

Cooley (2021), what legal precedent was established for tribal sovereignty by this ruling?

The legal precedent established for tribal sovereignty by this ruling is that tribal police officers have the authority to detain and search non-Native Americans on public roads within a reservation if there is reasonable suspicion of a crime. This reaffirms the principle that tribal governments have the inherent authority to enforce their own laws and regulations within their territories.