; (ii) secured or unsecured release on bond; or (iii) participation in a program described in subsection (f). (B) Monthly review Not less frequently than monthly, the immigration judge shall review any condition assigned to an alien pursuant to subparagraph (A). (C) Modification of conditions of supervision An immigration judge may modify or rescind conditions of supervision imposed on an alien by the Secretary of Homeland Security. (5) Special rule for vulnerable persons and primary caregivers (A) In general In the case of an alien subject to a custody determination under this subsection who is a vulnerable person or a primary caregiver, the alien may not be detained unless the Secretary of Homeland Security demonstrates, in addition to the requirements under paragraph (3), that it is unreasonable or not practicable to place the alien in a community-based supervision program. (B) Definitions In this paragraph: (i) Material witness The term material witness means an individual who presents a declaration to an attorney investigating, prosecuting, or defending the workplace claim or from the presiding officer overseeing the workplace claim attesting that, to the best of the declarant’s knowledge and belief, reasonable cause exists to believe that the testimony of the individual will be relevant to the outcome of the workplace claim. (ii) Primary caregiver The term primary caregiver means an individual who is established to be a caregiver, parent, or close relative caring for or traveling with a child. (iii) Vulnerable person The term vulnerable person means an individual who— (I) is under 21 years of age or over 60 years of age; (II) is pregnant; (III) identifies as lesbian, gay, bisexual, transgender, queer, or intersex; (IV) is a victim or witness of a crime; (V) has filed a nonfrivolous civil rights claim in Federal or State court; (VI) has filed, or is a material witness to, a bonafide workplace claim; (VII) has a serious mental or physical illness or disability