Incarcerated individuals may be admitted to special housing units for any of the several situations described in this Part. Incarcerated individuals in special populations as defined in section 1.5 of this Title shall not be placed in segregated confinement for any length of time. No incarcerated individual may be placed in segregated confinement (SHU) for longer than necessary and for no more than 15 consecutive days or 20 total days in any 60-day period, except where a specific act constitutes a violent felony act, if occurring more than once in a 60-day period, the incarcerated individual may serve an additional 15 consecutive days but must spend at least 15-days in a residential rehabilitation unit (RRU) in between each placement in SHU. Incarcerated individuals will be transferred or moved to an RRU if they have additional confinement time after completing 15-days in SHU.