Foster care provides substitute living arrangements to protect maltreated children. The practice is remarkably common: it is estimated that 5 percent of children in the United States are placed in foster care at some point during childhood. These children exhibit poor outcomes as children and...

Foster care placement is strongly associated with crime--for example, close to one fifth of the prison population in the United States is comprised of former foster children--yet there is little evidence on whether this relationship is causal. Leveraging the quasi-random assignment of child...