Here is the unpublished opinion (h/t Pechanga), affirming the suppression of the evidence because of an improper appeal.
The Cabazon Band’s amicus brief is here.
People v. Shelton
Cabazon Band Amicus Brief in Criminal Case re: Authority of Tribal Security to Search for Weapons
Here is that brief, in a case captioned People v. Shelton (Cal. App. 4 Dist.):
Turtle Talk 