Rewrites federal rules for how unaccompanied alien children are screened and placed by requiring the Office of Refugee Resettlement (ORR) Director to make placement decisions under the statutory standard in 8 U.S.C. 1232(c)(2). It requires HHS to consult with DHS and the Attorney General before placements, collect criminal-history information and gang-screening information for older children, and bar or limit placements with certain individuals (including people with specified criminal histories and some noncitizens). The changes apply immediately on enactment to pending and future release, custody, and redetermination decisions, and certain senior officials may waive normal paperwork and rulemaking processes to implement the law quickly.