Securing BordersDetention and deportation are the two most extreme sanctions of an immigration penality that polices noncitizens, identifies those deemed dangerous, diseased, deceitful, or destitute, and refuses them entry or casts them out. They play a key role in regulating national borders, citizens, and populations. But what determines whether a noncitizen is deserving or undeserving? And how have anxieties about risky outsiders and the quest for security shaped