I'm confident they know exactly who this is.
In any event, if it's an Indian suspect, the reservations nowadays can be a little scary, as some of them have basically declared war on law enforcement. In some cases, they need to go in with multiple car loads of LEO's, just to serve a warrant.
One of my coworkers was just out in South Dakota visiting family on the “rez” and he said that the drug violence is getting pretty bad.
There are problems on the Pine Ridge rez that go well beyond a “little scary.”