28 CFR 541.22 - Status when placed in the SHU.
When placed in the SHU, you are either in administrative detention status or disciplinary segregation status.
(a) Administrative detention status. Administrative detention status is an administrative status which removes you from the general population when necessary to ensure the safety, security, and orderly operation of correctional facilities, or protect the public. Administrative detention status is non-punitive, and can occur for a variety of reasons.
(b) Disciplinary segregation status. Disciplinary segregation status is a punitive status imposed only by a Discipline Hearing Officer (DHO) as a sanction for committing a prohibited act(s).