(a) An alien detained by or in the custody of DHS may be provided medical, surgical, psychiatric, or dental care by HHS through interagency agreements under which DHS shall reimburse HHS. Aliens found to be in need of emergency care in the course of medical examination shall be treated to the extent deemed practical by the attending physician and if considered to be in need of further care, may be referred to DHS along with the physician's recommendations concerning such further care. (b) In case