To be admitted to a structured intervention unit, offenders have to meet certain criteria. Inmates may be moved for reasons related to the security of the penitentiary or of other inmates. That is how it's done now, and that will continue to be the case. Inmates can be segregated. The main difference has to do with being allowed out of their cells for at least four hours a day, two of which are for programs tailored to their needs and structured interventions led by professionals.
On November 6th, 2018. See this statement in context.