Jbone has had sucess on Tulalip. I am working my way up to it on my local sovereign nation. Many there know I do it everywhere else, and are very supportive of it. Also most native nations constitutions are very similar to our federal one. But if you are not native you are an "alien" on their sovereign land. So I would suggest talking to the counsel or the tribal Police chief, always be respectful, and many times you will be afforded that respect back.