28 CFR § 524.74
Activities clearance
July 24, 2020
(a) Except as provided for in paragraph (b) of this section, the Warden is the clearance authority on all transfers, temporary releases, community activities, and escorted trips.
(b) Witness Security cases. Central Office Inmate Monitoring Section staff shall be the clearance authority on all transfers, temporary releases, community activities, and escorted trips for Witness Security cases, except in a medical emergency. In a medical emergency, the Warden may transfer a Witness Security case to a local hospital for emergency medical care without prior clearance.