Since the 1960s, the U.S. prison population has increased fivefold. Prisons today hold one inmate for every one hundred adults — a record rate in American history, and one unmatched by any other country. But despite the high prison population, crime has stopped falling. Punishments can seem random in their severity and implementation, minorities and the poor still disproportionately become victims and inmates, and enforcement — particularly of probation and parole — is haphazard. How can crime be controlled? UCLA Public Policy professor Mark Kleiman, author of When Brute Force Fails, visited Zócalo to offer a new strategy for cutting crime, reducing the prison population, and still enacting swift, certain, and fair punishment.