I'm currently in the USA, but I'm not from there, and I don't really know very much about the legal differences and setups that apply to Native American reservations, beyond that gambling rules are different.
Tomorrow, if I follow the advice of Google Maps, I'll be driving through a Native American reservation in Oregon. I mentioned my planned route to a local, and they said it's a very scenic drive, but that I should take great care with my driving as the laws and legal processes were different there.
I couldn't tell if said local was being completely serious, or if they were making a joke, or if the differences are there but minor.
As a non-American tourist driving through a Native American reservation, what (if anything) do I need to know about the legal differences that exist?