20 USC 7883 - Complaint process for participation of private school children

(a) Procedures for complaints 
The Secretary shall develop and implement written procedures for receiving, investigating, and resolving complaints from parents, teachers, or other individuals and organizations concerning violations of section 7881 of this title by a State educational agency, local educational agency, educational service agency, consortium of those agencies, or entity. The individual or organization shall submit the complaint to the State educational agency for a written resolution by the State educational agency within a reasonable period of time.
(b) Appeals to Secretary 
The resolution may be appealed by an interested party to the Secretary not later than 30 days after the State educational agency resolves the complaint or fails to resolve the complaint within a reasonable period of time. The appeal shall be accompanied by a copy of the State educational agencys resolution, and a complete statement of the reasons supporting the appeal. The Secretary shall investigate and resolve the appeal not later than 120 days after receipt of the appeal.