'Brian Forst tackles the topic of errors of justice in a balanced manner that has been absent from the scholarly debate on the effects of the criminal justice policy on outcomes … no other book that addresses such a range of important criminal justice topics using the critical yardstick of analysis, and that is indeed the book's major strength … long overdue. The book provides a blueprint for the kinds of data we need to better estimate the extent and costs of real errors associated with criminal justice policy. Dr Forst is ideally suited to write this book. His expertise on statistical inference, criminal justice information systems, policing, prosecution, and the death penalty is put to powerful use here. The book is immensely readable, rigorous and thorough, yet it will be accessible to non-technical readers. This is a valuable scholarly contribution. I loved it!' Joan Petersilia, University of California, Irvine