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David Xol-Cholom, of Guatemala, hugs his son Byron at Los Angeles International Airport as they reunite after being separated some 18 months earlier during the Trump administration's separation of immigrant families, Jan. 22, 2020.
Ringo H.W. Chiu/AP
Long after the Trump administration's family separation policy was stopped, many parents have yet to be located. The Biden administration has inherited the effort.
Advocates look for clues and scour incomplete records. In the worst case scenario, a note might be as vague as "José, sent back to Guatemala."