Jury nullification is when a jury decides to ignore the law and come to a different decision that is not in line with the evidence presented in court. This means that even if the evidence suggests that someone is guilty of a crime, the jury can decide that the person is not guilty. Jury nullification book is a book that explains jury nullification, why it should be done, and how to do it. It tells people about the different cases where jury nullification has been used and what the results were. The book also provides advice on how to be a part of a jury that may want to use jury nullification to reach a different verdict.