; or (B) expresses a credible fear of persecution (as defined in section 235(b)(1)(B)(v)) or torture. (2) Release from custody Aliens referred for proceedings under this section shall be released from physical custody and processed in accordance with the procedures described in this section. (3) Alternatives to detention An adult alien, including a head of household, who has been referred for a proceeding under this section shall be supervised under the Alternatives to Detention program of U.S. Immigration and Customs Enforcement immediately upon release from physical custody and continuing for the duration of such proceeding. (4) Family unity The Secretary shall ensure, to the greatest extent practicable, that the referral of a family unit for proceedings under this section includes all members of such family unit who are traveling together. (5) Exceptions (A) Unaccompanied alien children The provisions under this section may not be applied to unaccompanied alien children (as defined in section 462(g) of the Homeland Security Act of 2002 ( 6 U.S.C. 279(g) )). (B) Applicability limitation (i) In general The Secretary shall only refer for proceedings under this section an alien described in clause (ii). (ii) Alien described An alien described in this clause is an alien who— (I) has not affirmatively shown, to the satisfaction of an immigration officer, that the alien has been physically present in the United States for more than the 14-day period immediately prior to the date on which the alien was encountered by U.S. Customs and Border Protection