This introductory textbook is unique because it was a collaborative effort by all Criminology and Criminal Justice professors at Southern Oregon University (SOU) in Ashland, Oregon. This book can be used on a quarter or semester system, as well as cover topics that may get left out of some introductory texts such as controversial issues in the criminal justice system. Further, we made it as comprehensive as possible to cover core concepts and areas in the criminal justice system including theory, policing, courts, corrections, and the juvenile justice system. Additionally, we created examples that will help make difficult concepts or ideas more relatable. Every section provides an overview of key terms, critical thinking questions for course engagement, assignments, and other ancillaries such as multimedia links, images, activity ideas, and more.