The SCOTUS cases covered two situations - a guy convicted of murder and another (the one that was deceided) was related to child sex abuse. The decision was th

The SCOTUS cases covered two situations - a guy convicted of murder and another (the one that was deceided) was related to child sex abuse. The decision was that congress had not disestablished the reservation as part of the Oklahoma Enabling Act of 1906, and so they could not be convicted in Oklahoma courts. This emphasizes, not diminishes, congresses role in deciding what reservations are established or not.