In recent years, the number of undocumented children entering the United States to seek asylum has skyrocketed. As part of the Trump administration’s “zero tolerance” immigration crackdown, children have been housed in what were meant to be temporary facilities. But many have wound up staying in detention centers for several months. Some of the nation’s top teachers are speaking out against child detention and raising concerns about the long-term effects of this practice on their mental health and learning.