Throughout the developing world, citizens often hesitate to bring crimes to the attention of the state, turning instead to their community – family, friends, and neighbors – who may brutally punish or even kill criminal suspects. Wilke's carried out field research in South Africa, where vigilantism of this kind causes an average of two deaths every day. Drawing on evidence from a randomized control trial, she explores how citizens’ willingness to take the law into their own hands is shaped by the capacity of law enforcement institutions like the police.