Regular citizens have a crucial role in the justice system. Serving on a jury is a civic responsibility and jurors make some of the most important decisions in the legal process. Members of grand juries decide if there is "probable cause" for cases to go to trial. Members of trial juries decide the verdicts in criminal and civil cases. This book explores the principles of the jury system and historic changes in an interesting and accessible way. Readers will learn about the right to an impartial jury, the deliberation process, groundbreaking cases, and much more.