 If the state cannot determine who the parent or the tribe is, then the state is required to notify the Secretary of the Interior.Notification must contain all the requisite information identified in 25 CFR § 23.111 and be sent by registered or certified mail with return receipt requested, and the parties notified have the right to an additional 20 days to prepare prior to the proceeding.Failure to provide such notice can cause a jurisdictional defect that may result in any such proceeding to be overturned.