physical injury to the individual, staff, or other incarcerated persons. If a person is not discharged from such housing at such a review, they shall promptly receive in writing the reasons for the determination and the program, treatment, service, or corrective action required before discharge. The incarcerated person shall be given access to the programs, treatment, and services specified, and shall be permitted to be discharged from such housing if the person so chooses and does not engage in behavior that presents a specific and significant risk of imminent serious physical injury to the individual, staff, or other incarcerated persons during the subsequent 15 days. Other than for purposes of protective custody, or upon the individual’s written request, no person may be held in an alternative unit for more than 60 days in any 6-month period. (C) No placement based on previous incident No person may be placed in an alternative unit for an act or incident for which they were previously placed in such unit. (4) Placement hearings (A) Placement in alternative unit Other than separation of individuals in protective custody or for purposes of confinement under paragraphs (2)(B)(iii), (2)(B)(iv), and (2)(B)(v), no person incarcerated in a Federal facility may be placed in an alternative unit unless and until it is determined in writing following a placement hearing that clear and convincing evidence shows the person committed one of the following acts at the time placement is sought, and the specific circumstances of the acts were so heinous or destructive that placement of the individual in general facility housing creates a specific and significant risk of imminent serious physical injury to staff or other incarcerated persons: (i) Causing or attempting to cause serious physical injury or death to another person. (ii) Compelling or attempting to compel another person, by force or threat of force, to engage in a sexual act. (iii) Leading, organizing, inciting, or attempting to cause a riot, or other similarly