25 CFR §1000.110

1. (a)A nonsignatory Tribe is a Tribe that either:
   1. (1)Does not meet the eligibility criteria in §§ 1000.115 and 1000.125 and, by resolution of its governing body, authorizes a Consortium to participate in self-governance on its behalf; or
   2. (2)Meets the eligibility criteria in §§ 1000.115 and 1000.125 but chooses to be a member of a Consortium and have a representative of the Consortium sign the compact and funding agreement on its behalf.
2. (b)A non-signatory Tribe under paragraph (a)(1) of this section:
   1. (1)May not sign the compact and funding agreement. A representative of the Consortium must sign both documents on behalf of the Tribe.
   2. (2)May only become a “signatory Tribe” if it independently meets the eligibility criteria in §§ 1000.115 and 1000.125.