As used in this section and 9 CAR § 100-310:

1. (1)

   1. (A) “Isolation” means the involuntary confinement of a youth in a locked room with authorization and staff supervision.
   2. (B) If the door is not locked, the confinement is not considered to be isolation.
   3. (C) Isolation does not include when doors are routinely locked (e.g., during sleeping hours) and isolation has not otherwise been imposed;

2. (2)

   1. (A) “Line-of-sight supervision” means a youth remaining visible to a staff member at all times.
   2. (B) Staff does not have to be looking directly at the youth, but staff must be able to see and notice all movement; and
3. (3) “Seriously disruptive or dangerous behavior” means a youth acts or threatens to act to disrupt a unit or poses an immediate safety or security risk to anyone in the unit.