To launch a valid appeal, you must first educate yourself on how the legal system works. The Jailhouse Juris Doctor was developed to meet the needs of incarcerated persons seeking to acquire a rudimentary understanding of the criminal law system and prepare them to appeal their cases. The traditional study of law takes years. This publication is an overview of the primary disciplines in criminal law defense. These essays cover general legal principles and are not specific to any single jurisdiction. Modern American jurisprudence is a culmination of legal systems found worldwide. This publication reflects the culmination of those principles. Memorizing is not as helpful as understanding the basic principles of law. Taking notes and using those notes to develop an outline is standard practice for law students and helps to retain a vast amount of information. One of the most critical aspects of the study of law is to view both sides of a legal issue and be able to argue either side. This allows you to anticipate counterarguments and think in terms of counter strategies.