According to over 100 child welfare caseworkers and attorneys we interviewed around the country, as rates of deportations increase, so do the numbers of children from immigrant families in foster care. Indeed, federal data released to the Applied Research Center through a Freedom of Information Act request shows that almost one in four people deported in the last year was the mother or father of a United States citizen.

Whatever the state of the debate, or rancor, over who should and should not be allowed to live in the U.S., the moral and bureaucratic fallout of deporting 400,000 people a year are accumulating to toxic levels. Child welfare caseworkers say that in the face of an opaque detention system, they are helpless to reunify families. And although federal law requires child welfare departments to make diligent efforts toward family reunification, when parents are detained that’s basically impossible.