The juvenile board may designate an office or a room, which may be located in a police facility or sheriff's offices, as the juvenile processing office for the temporary detention of a child taken into custody. The office may not be a cell or holding facility used for detentions other than detentions under this section. The juvenile board by written order may prescribe the conditions of the designation and limit the activities that may occur in the office during the temporary detention - A child may be detained in a juvenile processing office only for: 1) The return of the child to the custody of a person 2) The completion of essential forms and records required by the juvenile court or this title 3) The photographing and fingerprinting of the child if otherwise authorized at the time of temporary detention 4) The issuance of warnings to the child as required or permitted by this title - A child may not be left unattended in a juvenile processing office and is entitled to be accompanied by the child's parent, guardian, or other custodian or by the child's attorney