When in doubt, don't. I wandered on to the Gila River reservation south of Phoenix once and started shooting. What I remember the most is the tribal cop (Dept. of Interior) unsnapping his holster as he walked toward me. What he wanted was to just tell me I was trespassing and to leave. He did say; "I could confiscate your guns, arrest you, and you would face a hefty fine." I said; "What if I was just out here taking pictures?" He replied; "I could confiscate your camera, arrest you, and you would face a hefty fine."

Check with the tribal authorities before you do anything on a reservation other than drive down a paved road.