28 CFR §552.25

1. (a)The Warden may authorize the use of less-than-lethal weapons, including those containing chemical agents, only when the situation is such that the inmate:
   1. (1)Is armed and/or barricaded; or
   2. (2)Cannot be approached without danger to self or others; and
   3. (3)It is determined that a delay in bringing the situation under control would constitute a serious hazard to the inmate or others, or would result in a major disturbance or serious property damage.
2. (b)The Warden may delegate the authority under this regulation to one or more supervisors on duty and physically present, but not below the position of Lieutenant.