The ACLU of Montana, Western Native Voice, and the Native American Rights Fund sent a letter to the Principal of Polson High School to provide some background on the law that ensures that Native students are not prohibited from wearing traditional regalia at graduation. The letter requested that the school adjusts its policy in a way that unequivocally allows Native American students to wear traditional regalia at graduation without any prior restraint or approval.
Please see here for the attached letter.