; discharge Each incarcerated person shall be given access to the programs, treatment, and services specified under subparagraph (A), and shall be permitted to be discharged from an alternative unit 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 person, staff, or other incarcerated persons during the subsequent 15 days. (iv) Duration Other than for purposes of protective custody, or upon written request by the person, no person may be held in an alternative unit for more than 60 days during 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 the person was previously placed in such unit. (4) Placement hearings (A) Placement in alternative unit Other than separation of persons 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 that the person committed 1 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 person 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 serious disturbance that results in the taking of a hostage, major property damage, or serious physical harm to another person. (iv) Escaping, attempting to escape or facilitating an escape from a Federal facility or escaping, attempting to escape,