This simple document puts Canada in the position of having to prove it has jurisdcition to deal with members of a sovereign tribe. This is an interesting question that would force a clear answer because Canada does not have that authority. It is a matter for international law to decide. There is a proviso though. You can't use a lawyer.
Lawyers are officers of a foreign court.
If you hire one, you sell out your tribal sovereignty on the spot. You have to fight this on your own, or with the help of another tribal person familiar with international law. Exclusive jurisdiction was tried to varying degrees of success in the early 1990s by some Saskatchewan Indians charged with selling cigarettes illegally at a reserve and with operating an illegal casino on the Whitebear reserve. In the cigarette case, the Poitras brothers sold out by hiring a lawyer at the last minute. With the gaming charges, the Federation of Saskatchewan Indian Nations ended up with outright control of four casinos and 25 per cent of the profits of the one provincially owned casino.