Restraint device as defined in RCW 28A.600.485 means: A device used to assist in controlling a student including, but not limited to, metal handcuffs, plastic ties, ankle restraints, leather cuffs, other hospital-type restraints, pepper spray, tasers, or batons. This section shall not be construed as encouraging the use of these devices. A restraint device does not include a seat harness used to transport a student safely or other safety devices, including safety belts for wheelchairs, changing tables, booster seats, and other ambulatory or therapeutic devices when used for the purpose intended for the safety of a student.