Originally Posted by ispcapt

They're actually like any other US territory. While sovereign they still come under US law. Legal matters are before US courts and eventually could be to the US Supreme Ct. Criminal violations on reservation lands come under the jurisdiction of the FBI. So while sovereign they're still US possessions and their residents are US citizens.
Sort of look at them as a territory or another state which has it's own laws like any other territory or state but ultimately they're US property. Sovereignty does not mean independent from or a separate nation from the US. In fact, the sovereignty is only because Congress passed the law granting tribes their sovereignty. It pretty much means the tribal lands are another state, with laws like any other state. The USSC has also ruled tribal lands are still under the control of the federal govt but like states they can exercise some laws at their level. US territories are pretty independent to a degree of US control such as reservations. Therefore, without doing a lot of research into it I believe one could make the case the LEOSA is covered.