American Juvenile Justice is a definitive volume for courses on the criminology and policy analysis of adolescence. The focus is on the principles and policy of a separate and distinct system of juvenile justice. The book opens with an introduction of the creation of adolescence, presenting a justification for the category of the juvenile or a period of partial responsibility before full adulthood. Subsequent sections include empirical investigations of the nature of youth criminality and legal policy toward youth crime. At the heart of the book is an argument for a penal policy that recognizes diminished responsibility and a youth policy that emphasizes the benefits of letting the maturing process continue with minimal interruption. In this updated and expanded second edition, Zimring has included four new chapters with examinations on important topics including, US Supreme Court decisions of life sentences for minors, the elected use of juvenile courts over criminal court, punitive sex offender registration for juveniles, and appropriate tactics for juvenile justice reform.