Here are the materials in Young-Man v. Fallon Paiute-Shoshone Tribe (D. Nev.):
tribal lay advocate
Federal Court Refuses to Suppress Statements Made to FBI under Advice of Tribal Court Lay Advocate
Here are the materials in United States v. Chase Alone (D. S.D.):
Apparently under the Red Bird case, a tribal lay advocate is not “counsel” under the Fifth and Sixth Amendments, so any statements made to the FBI after a tribal criminal defendant is represented by a lay advocate are not required to be suppressed.