; and (B) not less than 15 years of experience in the field of child and adolescent development or child welfare. (10) Expert in pediatric medicine The term expert in pediatric medicine means— (A) an individual who is board-certified in pediatric medicine in one or more States; or (B) an individual with an advanced degree in pediatric medicine on the faculty of an institution of higher education in the United States. (11) Migration deterrence program The term migration deterrence program means an action relating to the repatriation or referral for prosecution of one or more individuals apprehended by the Secretary or a cooperating entity for a suspected or confirmed violation of the Immigration and Nationality Act ( 8 U.S.C. 1101 et seq.). (12) Secretary The term Secretary means the Secretary of Homeland Security. (13) Unaccompanied alien child The term unaccompanied alien child has the meaning given the term in section 462(g) of the Homeland Security Act of 2002 ( 6 U.S.C. 279(g) ). 3. Child welfare at the border (a) Guidelines The Secretary, in consultation with the Secretary of Health and Human Services, experts in child development, experts in child welfare, experts in pediatric medicine, and the American Bar Association Center on Children and the Law, shall develop guidelines for the treatment of children in the custody of the Commissioner. (b) Mandatory training The Secretary, in consultation with the Secretary of Health and Human Services, shall— (1) require all U.S. Customs and Border Protection personnel, and cooperating entity personnel, who have contact with a child at a port of entry or Border Patrol station to undergo appropriate training, which shall include live training, on— (A) the applicable legal authorities, policies, practices, and procedures relating to children; and (B) child development, trauma, and the manner in which trauma affects the health and behavior of children