 As the surge of migrants at the U.S. southern border continues, so too the number of unaccounted migrants continues to, immigrant children, that is, continues to grow. Unaccompanied migrants under 18 can't be deported. Most spend a few weeks in government shelters before they're handed over to relatives or sponsors. Case managers are supposed to follow up. But according to government data obtained by the New York Times, more than a third of the migrant kids released into the U.S.,