Isolation as defined in RCW 28A.600.485 means: Restricting the student alone within a room or any other form of enclosure, from which the student may not leave. It does not include a student's voluntary use of a quiet space for self-calming, or temporary removal of a student from his or her regular instructional area to an unlocked area for purposes of carrying out an appropriate positive behavior intervention plan.
Wash. Admin. Code § 392-172A-01107