Someone somewhere has something to hide. Whatever it is I bet it cost taxpayers a bundle.
Simple solution:
Rescind the treaties, give them their land back, and stop giving them money. Heck, they'd probably make much more money from royalties from the resources sold than from any government handout of a portion of that money.
The posts mostly debate how much money to give the band. Again, just give them their land back and forget about the money. The resources from the land will likely be worth more than any money the government can throw at them.